Since there has been so much discussion over extruder temps and what
temps people are using - I've been wondering if we've all been
speaking the same language. Is your 220C the same as my 220C?
I was not sure how to address this issue...until today. I received a
fresh batch of thermistors from MakerBot and noticed that all ten of
them have really small glass beads (~1mm vs. the ~3mm beads I've been
using). I've noticed a couple of these smaller ones before but just
assumed they worked the same. So, I was putting together a 0.5mm
nozzle assembly today - I've built (or rebuilt) quite a few over the
last several months. And, I simply could not get this one to work at
less that 225C (spotty) and decent at 230C. What was coming out at
225C looked like about 200C on my other 0.5mm extruder. Hmmm. So, I
tried a couple of tests. The first test involved a hot plate, three
thermistors and a recently borrowed Fluke meter with a thermocouple
module - more on this in a later post is anyone is interested - but I
certainly got the impression that thermistors with different size
beads have different heating characteristics (not surprising) but it
gave me the following idea...
I hooked up two thermistors - one large bead, one small bead - on one
nozzle and wired them up using two extruder boards (my second makerbot
was just used to read the temp on the alt thermistor). Test 1 involved
using the small bead as the primary thermistor. I heated the
plastruder to 225C - the small bead showed 225C (v1.6 w/ PID on both
bots) and the large bead showed 197C. I left it like this for several
minutes and the results were constant. Then I reversed the process
using the large bead as the primary and heated it to 215C. The large
bead showed 215C and the small bead showed 245C. I left it like this
for several minutes and the results were constant.
So, what happens when you have two distinct bots - one with a large
bead thermistor and one with a small bead thermistor - is 220C the
same on both? I will try using the Fluke/thermocouple as the next
experiment but it varies by ~30C from either thermistor...which makes
establishing actual temps kind of tricky. However, based on the hot
plate test and the nozzle test I'm getting the impression that big
bead botters and little bead botters are not speaking the same
language. I think that language may be off by 20C or 30C.
The next time you discuss extruder problems also indicate your bead
size...
That could explain some of my problems with my extruder (small bead) It really wasn't coming out too quick at 220C and I was rather hesitant to make it hotter.
Rick wrote:
> Since there has been so much discussion over extruder temps and what
> temps people are using - I've been wondering if we've all been
> speaking the same language. Is your 220C the same as my 220C?
> I was not sure how to address this issue...until today. I received a
> fresh batch of thermistors from MakerBot and noticed that all ten of
> them have really small glass beads (~1mm vs. the ~3mm beads I've been
> using). I've noticed a couple of these smaller ones before but just
> assumed they worked the same. So, I was putting together a 0.5mm
> nozzle assembly today - I've built (or rebuilt) quite a few over the
> last several months. And, I simply could not get this one to work at
> less that 225C (spotty) and decent at 230C. What was coming out at
> 225C looked like about 200C on my other 0.5mm extruder. Hmmm. So, I
> tried a couple of tests. The first test involved a hot plate, three
> thermistors and a recently borrowed Fluke meter with a thermocouple
> module - more on this in a later post is anyone is interested - but I
> certainly got the impression that thermistors with different size
> beads have different heating characteristics (not surprising) but it
> gave me the following idea...
> I hooked up two thermistors - one large bead, one small bead - on one
> nozzle and wired them up using two extruder boards (my second makerbot
> was just used to read the temp on the alt thermistor). Test 1 involved
> using the small bead as the primary thermistor. I heated the
> plastruder to 225C - the small bead showed 225C (v1.6 w/ PID on both
> bots) and the large bead showed 197C. I left it like this for several
> minutes and the results were constant. Then I reversed the process
> using the large bead as the primary and heated it to 215C. The large
> bead showed 215C and the small bead showed 245C. I left it like this
> for several minutes and the results were constant.
> So, what happens when you have two distinct bots - one with a large
> bead thermistor and one with a small bead thermistor - is 220C the
> same on both? I will try using the Fluke/thermocouple as the next
> experiment but it varies by ~30C from either thermistor...which makes
> establishing actual temps kind of tricky. However, based on the hot
> plate test and the nozzle test I'm getting the impression that big
> bead botters and little bead botters are not speaking the same
> language. I think that language may be off by 20C or 30C.
> The next time you discuss extruder problems also indicate your bead
> size...
On Tue, Nov 10, 2009 at 12:24 AM, Nils <c60n...@gmail.com> wrote:
> That could explain some of my problems with my extruder (small bead) It
> really wasn't coming out too quick at 220C and I was rather hesitant to
> make it hotter.
> Rick wrote:
>> Since there has been so much discussion over extruder temps and what
>> temps people are using - I've been wondering if we've all been
>> speaking the same language. Is your 220C the same as my 220C?
>> I was not sure how to address this issue...until today. I received a
>> fresh batch of thermistors from MakerBot and noticed that all ten of
>> them have really small glass beads (~1mm vs. the ~3mm beads I've been
>> using). I've noticed a couple of these smaller ones before but just
>> assumed they worked the same. So, I was putting together a 0.5mm
>> nozzle assembly today - I've built (or rebuilt) quite a few over the
>> last several months. And, I simply could not get this one to work at
>> less that 225C (spotty) and decent at 230C. What was coming out at
>> 225C looked like about 200C on my other 0.5mm extruder. Hmmm. So, I
>> tried a couple of tests. The first test involved a hot plate, three
>> thermistors and a recently borrowed Fluke meter with a thermocouple
>> module - more on this in a later post is anyone is interested - but I
>> certainly got the impression that thermistors with different size
>> beads have different heating characteristics (not surprising) but it
>> gave me the following idea...
>> I hooked up two thermistors - one large bead, one small bead - on one
>> nozzle and wired them up using two extruder boards (my second makerbot
>> was just used to read the temp on the alt thermistor). Test 1 involved
>> using the small bead as the primary thermistor. I heated the
>> plastruder to 225C - the small bead showed 225C (v1.6 w/ PID on both
>> bots) and the large bead showed 197C. I left it like this for several
>> minutes and the results were constant. Then I reversed the process
>> using the large bead as the primary and heated it to 215C. The large
>> bead showed 215C and the small bead showed 245C. I left it like this
>> for several minutes and the results were constant.
>> So, what happens when you have two distinct bots - one with a large
>> bead thermistor and one with a small bead thermistor - is 220C the
>> same on both? I will try using the Fluke/thermocouple as the next
>> experiment but it varies by ~30C from either thermistor...which makes
>> establishing actual temps kind of tricky. However, based on the hot
>> plate test and the nozzle test I'm getting the impression that big
>> bead botters and little bead botters are not speaking the same
>> language. I think that language may be off by 20C or 30C.
>> The next time you discuss extruder problems also indicate your bead
>> size...
>> Rick
>> (I use extruder and plastruder interchangeably)
Ryan wrote:
> theres a wonderful little article on makerbot blog on how to calibrate
> your machine. If I had the time I would.
> On Tue, Nov 10, 2009 at 12:24 AM, Nils <c60n...@gmail.com> wrote:
>> That could explain some of my problems with my extruder (small bead) It
>> really wasn't coming out too quick at 220C and I was rather hesitant to
>> make it hotter.
>>> Since there has been so much discussion over extruder temps and what
>>> temps people are using - I've been wondering if we've all been
>>> speaking the same language. Is your 220C the same as my 220C?
>>> I was not sure how to address this issue...until today. I received a
>>> fresh batch of thermistors from MakerBot and noticed that all ten of
>>> them have really small glass beads (~1mm vs. the ~3mm beads I've been
>>> using). I've noticed a couple of these smaller ones before but just
>>> assumed they worked the same. So, I was putting together a 0.5mm
>>> nozzle assembly today - I've built (or rebuilt) quite a few over the
>>> last several months. And, I simply could not get this one to work at
>>> less that 225C (spotty) and decent at 230C. What was coming out at
>>> 225C looked like about 200C on my other 0.5mm extruder. Hmmm. So, I
>>> tried a couple of tests. The first test involved a hot plate, three
>>> thermistors and a recently borrowed Fluke meter with a thermocouple
>>> module - more on this in a later post is anyone is interested - but I
>>> certainly got the impression that thermistors with different size
>>> beads have different heating characteristics (not surprising) but it
>>> gave me the following idea...
>>> I hooked up two thermistors - one large bead, one small bead - on one
>>> nozzle and wired them up using two extruder boards (my second makerbot
>>> was just used to read the temp on the alt thermistor). Test 1 involved
>>> using the small bead as the primary thermistor. I heated the
>>> plastruder to 225C - the small bead showed 225C (v1.6 w/ PID on both
>>> bots) and the large bead showed 197C. I left it like this for several
>>> minutes and the results were constant. Then I reversed the process
>>> using the large bead as the primary and heated it to 215C. The large
>>> bead showed 215C and the small bead showed 245C. I left it like this
>>> for several minutes and the results were constant.
>>> So, what happens when you have two distinct bots - one with a large
>>> bead thermistor and one with a small bead thermistor - is 220C the
>>> same on both? I will try using the Fluke/thermocouple as the next
>>> experiment but it varies by ~30C from either thermistor...which makes
>>> establishing actual temps kind of tricky. However, based on the hot
>>> plate test and the nozzle test I'm getting the impression that big
>>> bead botters and little bead botters are not speaking the same
>>> language. I think that language may be off by 20C or 30C.
>>> The next time you discuss extruder problems also indicate your bead
>>> size...
>>> Rick
>>> (I use extruder and plastruder interchangeably)
> Since there has been so much discussion over extruder temps and what
> temps people are using - I've been wondering if we've all been
> speaking the same language. Is your 220C the same as my 220C?
> I was not sure how to address this issue...until today. I received a
> fresh batch of thermistors from MakerBot and noticed that all ten of
> them have really small glass beads (~1mm vs. the ~3mm beads I've been
> using). I've noticed a couple of these smaller ones before but just
> assumed they worked the same. So, I was putting together a 0.5mm
> nozzle assembly today - I've built (or rebuilt) quite a few over the
> last several months. And, I simply could not get this one to work at
> less that 225C (spotty) and decent at 230C. What was coming out at
> 225C looked like about 200C on my other 0.5mm extruder. Hmmm. So, I
> tried a couple of tests. The first test involved a hot plate, three
> thermistors and a recently borrowed Fluke meter with a thermocouple
> module - more on this in a later post is anyone is interested - but I
> certainly got the impression that thermistors with different size
> beads have different heating characteristics (not surprising) but it
> gave me the following idea...
> I hooked up two thermistors - one large bead, one small bead - on one
> nozzle and wired them up using two extruder boards (my second makerbot
> was just used to read the temp on the alt thermistor). Test 1 involved
> using the small bead as the primary thermistor. I heated the
> plastruder to 225C - the small bead showed 225C (v1.6 w/ PID on both
> bots) and the large bead showed 197C. I left it like this for several
> minutes and the results were constant. Then I reversed the process
> using the large bead as the primary and heated it to 215C. The large
> bead showed 215C and the small bead showed 245C. I left it like this
> for several minutes and the results were constant.
> So, what happens when you have two distinct bots - one with a large
> bead thermistor and one with a small bead thermistor - is 220C the
> same on both? I will try using the Fluke/thermocouple as the next
> experiment but it varies by ~30C from either thermistor...which makes
> establishing actual temps kind of tricky. However, based on the hot
> plate test and the nozzle test I'm getting the impression that big
> bead botters and little bead botters are not speaking the same
> language. I think that language may be off by 20C or 30C.
> The next time you discuss extruder problems also indicate your bead
> size...
If you're using a 3mm Thermistor, your ABS melts at a sensed temperature of ~220˚C, which is the "correct" temperature. If you're using a 1mm Thermistor, your ABS melts at higher sensed temperatures, perhaps as much as 30 degrees higher.
It would seem to me that the 1mm Thermistors are pretty bad!
Thanks for the research, Rick - I don't like Thermistors at the best of times because of the in-batch variability, but this is a serious issue you've uncovered! I'm thinking this will either require: A) A software/firmware release that can account for different Thermistor sizes and tweak accordingly B) Mass replacement of thermistors. Thanks, Thermistor suppliers!
Can't wait to measure mine when I get home, now. Team Makerbot: If I have to get a new Thermistor, what part number is the 3mm Thermistor so I can do so right away?
Here is some add'l calibration data from mounting the Fluke/thermocouple
along side the thermistor on the nozzle. These results show the temp setting
and once the temp stabilized the corresponding thermocouple reading.
Small bead thermistor:
initial reading:
small: 16C
thermo: 19C
100C setting:
thermo: 94/95
200C setting:
thermo: 183
210C setting
thermo: 189
220C setting
thermo: 195
230C setting
thermo: 203
240C setting
thermo: 210
250C setting:
thermo: 220
---
Large bead thermistor:
100C
thermo: 110
190C
th: 200
200C
th: 207
210C
th: 215
220C
th: 224
230C
th: 230
235C
th: 236
Rick
On Tue, Nov 10, 2009 at 9:58 AM, Cathal Garvey <cathalgar...@gmail.com>wrote:
> If you're using a 3mm Thermistor, your ABS melts at a sensed temperature of
> ~220˚C, which is the "correct" temperature.
> If you're using a 1mm Thermistor, your ABS melts at higher sensed
> temperatures, perhaps as much as 30 degrees higher.
> It would seem to me that the 1mm Thermistors are pretty bad!
> Thanks for the research, Rick - I don't like Thermistors at the best of
> times because of the in-batch variability, but this is a serious issue
> you've uncovered! I'm thinking this will either require:
> A) A software/firmware release that can account for different Thermistor
> sizes and tweak accordingly
> B) Mass replacement of thermistors. Thanks, Thermistor suppliers!
> Can't wait to measure mine when I get home, now.
> Team Makerbot: If I have to get a new Thermistor, what part number is the
> 3mm Thermistor so I can do so right away?
Hmm. This is NOT GOOD. I had thought the manufacturer just changed the
thermistor a bit, but I guess its a slightly different one. The good news:
we can easily generate a new lookup table and the existing small thermistors
will be just fine.
First one to post the updated lookup table that properly reports values
wins. Hint: you can get most of the values from the datasheet or measure
them directly.
In the meantime, I'll try and find a better thermistor replacement (the
original flavor was discontinued)
On Tue, Nov 10, 2009 at 1:07 AM, Rick <rick.poll...@gmail.com> wrote:
> Since there has been so much discussion over extruder temps and what
> temps people are using - I've been wondering if we've all been
> speaking the same language. Is your 220C the same as my 220C?
> I was not sure how to address this issue...until today. I received a
> fresh batch of thermistors from MakerBot and noticed that all ten of
> them have really small glass beads (~1mm vs. the ~3mm beads I've been
> using). I've noticed a couple of these smaller ones before but just
> assumed they worked the same. So, I was putting together a 0.5mm
> nozzle assembly today - I've built (or rebuilt) quite a few over the
> last several months. And, I simply could not get this one to work at
> less that 225C (spotty) and decent at 230C. What was coming out at
> 225C looked like about 200C on my other 0.5mm extruder. Hmmm. So, I
> tried a couple of tests. The first test involved a hot plate, three
> thermistors and a recently borrowed Fluke meter with a thermocouple
> module - more on this in a later post is anyone is interested - but I
> certainly got the impression that thermistors with different size
> beads have different heating characteristics (not surprising) but it
> gave me the following idea...
> I hooked up two thermistors - one large bead, one small bead - on one
> nozzle and wired them up using two extruder boards (my second makerbot
> was just used to read the temp on the alt thermistor). Test 1 involved
> using the small bead as the primary thermistor. I heated the
> plastruder to 225C - the small bead showed 225C (v1.6 w/ PID on both
> bots) and the large bead showed 197C. I left it like this for several
> minutes and the results were constant. Then I reversed the process
> using the large bead as the primary and heated it to 215C. The large
> bead showed 215C and the small bead showed 245C. I left it like this
> for several minutes and the results were constant.
> So, what happens when you have two distinct bots - one with a large
> bead thermistor and one with a small bead thermistor - is 220C the
> same on both? I will try using the Fluke/thermocouple as the next
> experiment but it varies by ~30C from either thermistor...which makes
> establishing actual temps kind of tricky. However, based on the hot
> plate test and the nozzle test I'm getting the impression that big
> bead botters and little bead botters are not speaking the same
> language. I think that language may be off by 20C or 30C.
> The next time you discuss extruder problems also indicate your bead
> size...
I have a really handy spreadsheet somewhere that does the hard work of making the lookup table based on a few input temperatures.. I'll post it when I find it!
basically, the thermistor lookup script needs one value, the thermistor Beta
which the above page will generate. give it two temps and two readings on
your thermistor and it will calculate the beta for you exactly. you then
plug that into the python script located here:
http://svn.reprap.org/trunk/reprap/firmware/Arduino/utilities/createT...
the output from that script gets directly placed into the file
ArduinoSlaveExtruder/ThermistorTable.cpp, recompiled and uploaded to your
extruder.
I've generated 2 tables for y'all. One more conservative, and one less
conservative. Please try them and let us know how they work:
> I have a really handy spreadsheet somewhere that does the hard work of
> making the lookup table based on a few input temperatures.. I'll post it
> when I find it!
> Hmm. This is NOT GOOD. I had thought the manufacturer just changed > the thermistor a bit, but I guess its a slightly different one. The > good news: we can easily generate a new lookup table and the > existing small thermistors will be just fine.
> First one to post the updated lookup table that properly reports > values wins. Hint: you can get most of the values from the > datasheet or measure them directly.
> In the meantime, I'll try and find a better thermistor replacement > (the original flavor was discontinued)
> Cheers, > Zach
--
"The future is already here. It's just not very evenly distributed" -- William Gibson
This would aid in decentralising production if Team Makerbot upscales, too. It's probably not easy to get identical thermistors in different areas if one supplier alone provides such gross differences. It would also help streamline one of the (probably) most annoying parts of making a scratch-built Bot.
Why don't thermistor manufacturers test thermistors and provide tables on purchase? Having to make a table for each thermistor is hella annoying.
Anyone looked into using IR sensors to detect nozzle temperatures? :) Probably easier to standardise, would make an interesting "premium" upgrade!
It may actually be 205C or something like that. But (using a large bead)
I've run my ABS at 205C (what was reported as 205C). ABS really does print
at lower temps...
Sounds like you have a well-tuned plastruder...glad to hear your HPDE is
working...
On Tue, Nov 10, 2009 at 11:31 PM, Todd Fleming <tbflem...@gmail.com> wrote:
> Thank you thank you thank you for discovering and reporting this! My
> struggles with HDPE now seem to be over.
> This does make me curious about something. Why am I able to print ABS at
> 200C? (I thought it was at 230 because of my 1mm thermistor...)
One more thing - I was going through my thermistors and noticed there is
also an intermediate sized thermistor - larger than 1mm but smaller than
3mm. Not sure how common or how it performs though...
Rick
On Wed, Nov 11, 2009 at 10:57 AM, Rick Pollack <rick.poll...@gmail.com>wrote:
> It may actually be 205C or something like that. But (using a large bead)
> I've run my ABS at 205C (what was reported as 205C). ABS really does print
> at lower temps...
> Sounds like you have a well-tuned plastruder...glad to hear your HPDE is
> working...
> Rick
> On Tue, Nov 10, 2009 at 11:31 PM, Todd Fleming <tbflem...@gmail.com>wrote:
>> Thank you thank you thank you for discovering and reporting this! My
>> struggles with HDPE now seem to be over.
>> This does make me curious about something. Why am I able to print ABS at
>> 200C? (I thought it was at 230 because of my 1mm thermistor...)
For those creating their own lookup table for the Extruder Controller
v2.2 [Batch >= 5], r1, r2, and max-adc will always be 0, 4700, and
1023 respectively.
Go!
=ml=
On Nov 11, 9:06 am, Rick Pollack <rick.poll...@gmail.com> wrote:
> One more thing - I was going through my thermistors and noticed there is
> also an intermediate sized thermistor - larger than 1mm but smaller than
> 3mm. Not sure how common or how it performs though...
> Rick
> On Wed, Nov 11, 2009 at 10:57 AM, Rick Pollack <rick.poll...@gmail.com>wrote:
> > Todd -
> > You are welcome.
> > It may actually be 205C or something like that. But (using a large bead)
> > I've run my ABS at 205C (what was reported as 205C). ABS really does print
> > at lower temps...
> > Sounds like you have a well-tuned plastruder...glad to hear your HPDE is
> > working...
> > Rick
> > On Tue, Nov 10, 2009 at 11:31 PM, Todd Fleming <tbflem...@gmail.com>wrote:
> >> Thank you thank you thank you for discovering and reporting this! My
> >> struggles with HDPE now seem to be over.
> >> This does make me curious about something. Why am I able to print ABS at
> >> 200C? (I thought it was at 230 because of my 1mm thermistor...)
> For those creating their own lookup table for the Extruder Controller
> v2.2 [Batch >= 5], r1, r2, and max-adc will always be 0, 4700, and
> 1023 respectively.
> Go!
> =ml=
> On Nov 11, 9:06 am, Rick Pollack <rick.poll...@gmail.com> wrote:
> > One more thing - I was going through my thermistors and noticed there is
> > also an intermediate sized thermistor - larger than 1mm but smaller than
> > 3mm. Not sure how common or how it performs though...
> > Rick
> > On Wed, Nov 11, 2009 at 10:57 AM, Rick Pollack <rick.poll...@gmail.com>wrote:
> > > Todd -
> > > You are welcome.
> > > It may actually be 205C or something like that. But (using a large bead)
> > > I've run my ABS at 205C (what was reported as 205C). ABS really does print
> > > at lower temps...
> > > Sounds like you have a well-tuned plastruder...glad to hear your HPDE is
> > > working...
> > > Rick
> > > On Tue, Nov 10, 2009 at 11:31 PM, Todd Fleming <tbflem...@gmail.com>wrote:
> > >> Thank you thank you thank you for discovering and reporting this! My
> > >> struggles with HDPE now seem to be over.
> > >> This does make me curious about something. Why am I able to print ABS at
> > >> 200C? (I thought it was at 230 because of my 1mm thermistor...)
>> For those creating their own lookup table for the Extruder Controller
>> v2.2 [Batch >= 5], r1, r2, and max-adc will always be 0, 4700, and
>> 1023 respectively.
>> Go!
>> =ml=
>> On Nov 11, 9:06 am, Rick Pollack <rick.poll...@gmail.com> wrote:
>> > One more thing - I was going through my thermistors and noticed there is
>> > also an intermediate sized thermistor - larger than 1mm but smaller than
>> > 3mm. Not sure how common or how it performs though...
>> > Rick
>> > On Wed, Nov 11, 2009 at 10:57 AM, Rick Pollack <rick.poll...@gmail.com>wrote:
>> > > Todd -
>> > > You are welcome.
>> > > It may actually be 205C or something like that. But (using a large bead)
>> > > I've run my ABS at 205C (what was reported as 205C). ABS really does print
>> > > at lower temps...
>> > > Sounds like you have a well-tuned plastruder...glad to hear your HPDE is
>> > > working...
>> > > Rick
>> > > On Tue, Nov 10, 2009 at 11:31 PM, Todd Fleming <tbflem...@gmail.com>wrote:
>> > >> Thank you thank you thank you for discovering and reporting this! My
>> > >> struggles with HDPE now seem to be over.
>> > >> This does make me curious about something. Why am I able to print ABS at
>> > >> 200C? (I thought it was at 230 because of my 1mm thermistor...)
>> > >> Todd
> --
> You received this message because you are subscribed to the Google Groups "MakerBot Operators" group.
> To post to this group, send email to makerbot@googlegroups.com.
> To unsubscribe from this group, send email to makerbot+unsubscribe@googlegroups.com.
> For more options, visit this group at http://groups.google.com/group/makerbot?hl=.
On Tue, Nov 17, 2009 at 10:35 PM, Todd Fleming <tbflem...@gmail.com> wrote:
> Has anyone determined which of the proposed 3mm thermistor profiles is the
> correct one?
> For those creating their own lookup table for the Extruder Controller
> v2.2 [Batch >= 5], r1, r2, and max-adc will always be 0, 4700, and
> 1023 respectively.
> Go!
> =ml=
> On Nov 11, 9:06 am, Rick Pollack <rick.poll...@gmail.com> wrote:
> > One more thing - I was going through my thermistors and noticed there is
> > also an intermediate sized thermistor - larger than 1mm but smaller than
> > 3mm. Not sure how common or how it performs though...
> > Rick
> > On Wed, Nov 11, 2009 at 10:57 AM, Rick Pollack <rick.poll...@gmail.com>wrote:
> > > Todd -
> > > You are welcome.
> > > It may actually be 205C or something like that. But (using a large bead)
> > > I've run my ABS at 205C (what was reported as 205C). ABS really does print
> > > at lower temps...
> > > Sounds like you have a well-tuned plastruder...glad to hear your HPDE is
> > > working...
> > > Rick
> > > On Tue, Nov 10, 2009 at 11:31 PM, Todd Fleming <tbflem...@gmail.com>wrote:
> > >> Thank you thank you thank you for discovering and reporting this! My
> > >> struggles with HDPE now seem to be over.
> > >> This does make me curious about something. Why am I able to print ABS at
> > >> 200C? (I thought it was at 230 because of my 1mm thermistor...)
It looks like I have the 1mm bead, so I tested Zach's more and less conservative examples with a Fluke 88 using a temp probe under the insulation at the head of the nozzle:
"./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700
--beta=4198 --max-adc=1023" with a target temp of 220 and a Current Temp
of 221, held steady on the Fluke at 169
"./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700 --beta=4315 --max-adc=1023" @ 220 held steady at 197, 240 held steady around 212C
So I scrounged another multimeter and tested the resistance at 24C (room temp) and 150C (was easy to get it stable there), for values of 93.7K and .704K, then used reprap's calculator got a beta of 4881. Plugged all that in to the script for a new .ccp and hit/held 212C on the next try.
Here's my table, if anyone else wants to try it. I suggest ramping up the temp slowly in case the values are too hot for your unit.
I'm a newbie at this so please bear with me. This looks to me to be a
firmware update and therefore requires the arduino IDE, ideally with
the sanguino patch (although not strictly necessary for the
plastruder). Also the USB2TTL cable must be plugged into the
plastruder in order to accomplish this. In reading over the firmware
update instructions there are times when the reset button must be
pushed, although exactly when is tricky.
Is the reset button push necessary when using this script ?
And are my above asumptions correct ?
Erring on the cautious side rather than blowing up my makerbot
Thanks and regards
Bill
On Nov 28, 11:08 am, jet <allartbu...@gmail.com> wrote:
> It looks like I have the 1mm bead, so I tested Zach's more and less
> conservative examples with a Fluke 88 using a temp probe under the
> insulation at the head of the nozzle:
> "./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700
> --beta=4198 --max-adc=1023" with a target temp of 220 and a Current Temp
> of 221, held steady on the Fluke at 169
> "./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700
> --beta=4315 --max-adc=1023" @ 220 held steady at 197, 240 held steady
> around 212C
> So I scrounged another multimeter and tested the resistance at 24C (room
> temp) and 150C (was easy to get it stable there), for values of 93.7K
> and .704K, then used reprap's calculator got a beta of 4881. Plugged
> all that in to the script for a new .ccp and hit/held 212C on the next try.
> Here's my table, if anyone else wants to try it. I suggest ramping up
> the temp slowly in case the values are too hot for your unit.
Hi Jet, Like Sokkerbot, I'm a total newb. I've managed to install Python, the Arduino IDE, and the Sanguino patch. (FYI, I'm running a Win XP box) I'm trying to go slowly here:
I opened up my "\reprap-gen3-firmware-1.6\ArduinoSlaveExtruder" and located a file by the name of "ThermistorTable.cpp". This file appears to be written in plaintext and the content has a series of entries that resemble your post. I copied and pasted the text from your post and created a new "ThermistorTable.cpp" file. I open the Arduino IDE. I select the Arduino Decimlia board. I load "reprap-gen3-firmware-1.6/ArduinoSlaveExtruder/ ArduinoSlaveExtruder.pde" But, hitting compile causes an error - saying "26: error: SimplePacket.h: No such file or directory"
<I have not yet connected my computer to the plastruder board via the TTL to USB cable>
Suggestions?
Thank you, MakerBlock
On Nov 28, 8:08 am, jet <allartbu...@gmail.com> wrote:
> It looks like I have the 1mm bead, so I tested Zach's more and less > conservative examples with a Fluke 88 using a temp probe under the > insulation at the head of the nozzle:
> "./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700 > --beta=4198 --max-adc=1023" with a target temp of 220 and a Current Temp > of 221, held steady on the Fluke at 169
> "./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700 > --beta=4315 --max-adc=1023" @ 220 held steady at 197, 240 held steady > around 212C
> So I scrounged another multimeter and tested the resistance at 24C (room > temp) and 150C (was easy to get it stable there), for values of 93.7K > and .704K, then used reprap's calculator got a beta of 4881. Plugged > all that in to the script for a new .ccp and hit/held 212C on the next try.
> Here's my table, if anyone else wants to try it. I suggest ramping up > the temp slowly in case the values are too hot for your unit.
And by "simple", I mean it has links to the detailed instructions written by other people. :-)
The short of it is, follow the wiki tutorial on upgrading firmware. When you get that working with the stock software, try swapping out the thermistortable file and build again.
MakerBlock wrote: > Hi Jet, > Like Sokkerbot, I'm a total newb. I've managed to install Python, the > Arduino IDE, and the Sanguino patch. (FYI, I'm running a Win XP box) > I'm trying to go slowly here:
> I opened up my "\reprap-gen3-firmware-1.6\ArduinoSlaveExtruder" and > located a file by the name of "ThermistorTable.cpp". > This file appears to be written in plaintext and the content has a > series of entries that resemble your post. > I copied and pasted the text from your post and created a new > "ThermistorTable.cpp" file. > I open the Arduino IDE. > I select the Arduino Decimlia board. > I load "reprap-gen3-firmware-1.6/ArduinoSlaveExtruder/ > ArduinoSlaveExtruder.pde" > But, hitting compile causes an error - saying "26: error: > SimplePacket.h: No such file or directory"
> <I have not yet connected my computer to the plastruder board via the > TTL to USB cable>
> Suggestions?
> Thank you, > MakerBlock
> On Nov 28, 8:08 am, jet <allartbu...@gmail.com> wrote: >> It looks like I have the 1mm bead, so I tested Zach's more and less >> conservative examples with a Fluke 88 using a temp probe under the >> insulation at the head of the nozzle:
>> "./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700 >> --beta=4198 --max-adc=1023" with a target temp of 220 and a Current Temp >> of 221, held steady on the Fluke at 169
>> "./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700 >> --beta=4315 --max-adc=1023" @ 220 held steady at 197, 240 held steady >> around 212C
>> So I scrounged another multimeter and tested the resistance at 24C (room >> temp) and 150C (was easy to get it stable there), for values of 93.7K >> and .704K, then used reprap's calculator got a beta of 4881. Plugged >> all that in to the script for a new .ccp and hit/held 212C on the next try.
>> Here's my table, if anyone else wants to try it. I suggest ramping up >> the temp slowly in case the values are too hot for your unit.
> You received this message because you are subscribed to the Google Groups "MakerBot Operators" group. > To post to this group, send email to makerbot@googlegroups.com. > To unsubscribe from this group, send email to makerbot+unsubscribe@googlegroups.com. > For more options, visit this group at http://groups.google.com/group/makerbot?hl=en.
