> On Jun 1, 7:38 pm, Damien P <athe...@gmail.com> wrote:
> > On Jun 1, 12:17 pm, Scott B <solar.sen...@gmail.com> wrote:
> > > Strong simple frame
> > Some of the ones shown on the page that Robert posted the other day
> > [1] seem to have very few parts. They replace the frames with laser-
> > cut acrylic or go without a frame (Printrbot style) [3].
> And some linear bearings (from about $1 ea for 8mm ones) and some
> ground shaft to suit (still looking for a cheap source - possibly
> ejector pins).
> On Jun 1, 8:18 pm, Scott B <solar.sen...@gmail.com> wrote:
> > the printrbot looks like a nice solution.
> > On Jun 1, 7:38 pm, Damien P <athe...@gmail.com> wrote:
> > > On Jun 1, 12:17 pm, Scott B <solar.sen...@gmail.com> wrote:
> > > > Strong simple frame
> > > Some of the ones shown on the page that Robert posted the other day
> > > [1] seem to have very few parts. They replace the frames with laser-
> > > cut acrylic or go without a frame (Printrbot style) [3].
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> If you're after a low effort / low cost 3D printer a friend of mine
> ordered this a few weeks ago:
> http://www.solidoodle.com/
> $500 from the States. I can give you an update on how it goes if you like.
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On Fri, Jun 1, 2012 at 9:42 PM, Ken <k...@waggies.net> wrote:
> Thanks Tamsyn, I did see that one on the net.
> The website still talks about pre-order, which makes it pretty risky, I
> reckon.
> Ken.
> On 1 June 2012 21:30, Tamsyn Michael <tamsyn.j.mich...@gmail.com> wrote:
>> @ Ken
>> If you're after a low effort / low cost 3D printer a friend of mine
>> ordered this a few weeks ago:
>> http://www.solidoodle.com/
>> $500 from the States. I can give you an update on how it goes if you
>> like.
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> :) - I'll let you know if my friend's investment disappears in a cloud of
> smoke.
> On Fri, Jun 1, 2012 at 9:42 PM, Ken <k...@waggies.net> wrote:
> > Thanks Tamsyn, I did see that one on the net.
> > The website still talks about pre-order, which makes it pretty risky, I
> > reckon.
> > Ken.
> > On 1 June 2012 21:30, Tamsyn Michael <tamsyn.j.mich...@gmail.com> wrote:
> >> @ Ken
> >> If you're after a low effort / low cost 3D printer a friend of mine
> >> ordered this a few weeks ago:
> >>http://www.solidoodle.com/
> >> $500 from the States. I can give you an update on how it goes if you
> >> like.
> >> --
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> >>http://groups.google.com/group/hackerspace-adelaide?hl=en.
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> On Jun 1, 7:38 pm, Damien P <athe...@gmail.com> wrote:
> > On Jun 1, 12:17 pm, Scott B <solar.sen...@gmail.com> wrote:
> > > Strong simple frame
> > Some of the ones shown on the page that Robert posted the other day
> > [1] seem to have very few parts. They replace the frames with laser-
> > cut acrylic or go without a frame (Printrbot style) [3].
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> On Jun 1, 12:04 pm, Scott B <solar.sen...@gmail.com> wrote:
> > I have been having a bit of a chat to Pix behind the scenes regarding
> > building/purchasing my own 3D printer.
> > At the moment we are looking at the possibility of building a
> > something like a MendelMax (http://reprap.org/wiki/MendelMax) -
> > using the reprap software and compatible electronics, but with my own
> > aluminium tube based frame and components to hopefully end up with a
> > higher quality machine than some of the questionable Huxley/Mendel
> > kits that are currently available.
> > We may also choose to make our own compatible main board that will
> > allow modular plug in stepper motor drivers and seperate power
> > supplies for the controls, hot end and heated bed - plent of options
> > to discuss yet.
> > So If anyone else is currently looking at building/buying a machine
> > also, stick your hand up – if you want to get on board we can group
> > buy the motors, drivers etc. and work together on the development -
> > if I am going to fire up the CNC Mill/Lathe to make one part for mine,
> > I mght as well press the 'Start' button a few more times a make a
> > few...
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> On Jun 1, 12:11 pm, Paul Schulz<p...@mawsonlakes.org> wrote:
>> Please count me in.. although at this stage I am really interested in
>> a 'whiteboard' writing bot.
>> (I'll need stepper motors and a controller).
> I'll have to give this a shot one day too. I've got some regular
> motors with gearboxes on them. They're probably a bit slow but
> they'll do for starters.
> One thing I thought about with steppers is they might not have the
> holding torque when the string is almost horizontal.
> n Jun 2, 1:34 am, Steven Pickles <thatpix...@gmail.com> wrote:
>> The Vision printer looks like a pretty sensible mendel variant (if you have
>> a laser cutter). Acrylic is not a terribly cheap medium though.
> I'm sure plywood cut with a scroll saw would work just as well - it
> just won't look as cool!
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Lurk Mode off
I have been lurking on the list for a few weeks now having just discovered the concept of Hackerspaces etc just to get a feel of the whole idea.
Anyway just offering my 2c worth on this one, I built a Techzone Huxley last year (had to shelve it when the hot end I made melted the carriage & I needed a 3D printer to print a replacement! wish I knew about HackAdel then) also that kit didn't use a Heated bed so the ABS I bought really didn't stick well & finding PLA in Australia 12months ago was not as easy as today.
Earlier on this year I bought a Thingomatic clone from a WA ebay source $1200 delivered with 3kg of 1.75mm ABS & I recently found this crowd http://www.mbot3d.com/ & this unit looks exactly like the clone I bought, so it may be the WA blokes source but I thought it was worth mentioning also they have a kit option as well as reasonably priced preassembled units the blue perspex one looks cool.
One of the 1st things I printed is the parts for a MendleMax & now I'm in the process of sourcing the metalwork etc for it so I'm more than willing to share the work I've done & definitely helping fill out orders to get price breaks if that works
Having said that I must admit the simplicity of the http://www.thingiverse.com/thing:16076 Aluminium Mendle & Build envelope has me leaning that way as well since all I have purchased so far is the lead screws from TechPalidin & the extruder cog off Makerbot.
With all things reprap half the fun is the build & I had decided to hybridise the basic MendleMax with a Makerbot style Mk 7 minimal extruder & my adapted hotend re that if anyone wants pointers on how to make 0.4 to 0.5mm holes in the end of brass bolts I can help there too. With my experience now with my "Fakerbot" & the Huxley issues I can definitly say that the heated bed is a must while the PCB version is very attractive a 300mm sq one has its own challenges but the lo ohm resistors & a seperate power supply controlled via a SSR in turn controlled by the RAMPS electronics using a nice thick piece of Aluminium plate to spread the heat was where I was going (esp since I had left over resistors from building my hot end)
On Friday, 1 June 2012 12:34:13 UTC+9:30, Scott B wrote:
> I have been having a bit of a chat to Pix behind the scenes regarding > building/purchasing my own 3D printer.
> At the moment we are looking at the possibility of building a > something like a MendelMax ( http://reprap.org/wiki/MendelMax ) - > using the reprap software and compatible electronics, but with my own > aluminium tube based frame and components to hopefully end up with a > higher quality machine than some of the questionable Huxley/Mendel > kits that are currently available.
> We may also choose to make our own compatible main board that will > allow modular plug in stepper motor drivers and seperate power > supplies for the controls, hot end and heated bed - plent of options > to discuss yet.
> So If anyone else is currently looking at building/buying a machine > also, stick your hand up – if you want to get on board we can group > buy the motors, drivers etc. and work together on the development - > if I am going to fire up the CNC Mill/Lathe to make one part for mine, > I mght as well press the 'Start' button a few more times a make a > few...
Cool! If this becomes a thing, then I'd love to become involved (ie go in
for a share of parts) - especially if it's that cheap. I may do the
drawing robot, but then again I might make an arm for a beer fetching
robot. We'll see. :)
Here's an idea for simplifying the Y (?) axis (the one with the bed on
it). You could put the motor in the base (as you've done for the Z
axis), and instead of using a belt, use a rack and pinion instead.
Put a small gear on the motor shaft, and if that's not precise enough,
add a few more gears. Attach the rack to the bed. This avoids the
belt, which simplifies the assembly and avoids problems with the belt
stretching during use, which seems to cause blobs on the printed
object. You also won't have any belt wheels that can snap, which will
save a few parts.
There are some herringbone rack and pinion designs on thingiverse for just
this purpose... (would link but I'm on my phone)
On Jun 3, 2012 11:15 AM, "Damien P" <athe...@gmail.com> wrote:
> Here's an idea for simplifying the Y (?) axis (the one with the bed on
> it). You could put the motor in the base (as you've done for the Z
> axis), and instead of using a belt, use a rack and pinion instead.
> Put a small gear on the motor shaft, and if that's not precise enough,
> add a few more gears. Attach the rack to the bed. This avoids the
> belt, which simplifies the assembly and avoids problems with the belt
> stretching during use, which seems to cause blobs on the printed
> object. You also won't have any belt wheels that can snap, which will
> save a few parts.
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> One thing I thought about with steppers is they might not have the
> holding torque when the string is almost horizontal.
this is where you want to unassemble old (referably dead) HP4 laser printers.
or even the old 8000 series. they have plenty of sturdy steppers in them =)
also someof the old scanners have decent steppers in them and a toothed belt.
keep the small gear on the stepper and put a much larger gear on the
output shaft.
you get the torque multiplication there for free ;)
i've see the double string drawing bots done this way to move much
larger "print heads" that would other wise be way to heavy.
cheers,
kim
-- "Art without engineering is dreaming; engineering without art is
calculating." --SKR
> Here's an idea for simplifying the Y (?) axis (the one with the bed on
> it). You could put the motor in the base (as you've done for the Z
> axis), and instead of using a belt, use a rack and pinion instead.
The problem I see with this is avoiding backlash in the gearing setup.
I found you can get reasonably inexpensive MXL pullies and belts on
ebay which give excellent performance.
On Jun 3, 2:49 pm, Greg <greg.fr...@baesystems.com> wrote:
> The problem I see with this is avoiding backlash in the gearing setup.
I guess I should have thought a bit more! I think the idea is worth
investigating, because it should reduce the part count. Maybe it's
possible to print a pair of gears with a built-in spring to reduce
backlash ([1])?
The Reprap Build System pages have some pages of a rack and pinion set
[2].
Those look like the exact steppers on the 15 machines I built last
year. They are a little under powered, but can be made to work with
careful tuning, particularly if you use lm8uu linear bearings to make
the axes easier to move and limit the acceleration in the firmware.
> its only half the torque of the usual NEMA17 though and it has a short
> output shaft.
> they also do pololu driver for under $15
> A HK ebay seller is doing a complete RAMPS 1.4 board with 5 stepper
> drivers and Mega for about $150 - very tempting as it would save a lot
> of time.
I had to re-design some of the parts to get those short shafted motors
to work (the extruder, X-end motor and Y motor bracket). My xend motor
design is now part of the standard prusa2, and most people use my
extruder.
On Jun 3, 8:44 pm, Scott B <solar.sen...@gmail.com> wrote:
> A HK ebay seller is doing a completeRAMPS1.4 board with 5 stepper
> drivers and Mega for about $150 - very tempting as it would save a lot
> of time.
I'm surprised at the cost of these boards, I didn't expect that to be
such a substantial part of the build.
Same guy is now selling a batch of 10 for $1000 - that is 10x mega's,
10 Shields and 50 step-sticks.... basically getting the shield for
free at that price.
I'm tempted to email him and see if he will do a similar price for a
batch of 5 (plus a few temp sensors - $1.50ea) - just to make sure we
don't
Ill take two of the board myself - have we got 3 other takers?
On Jun 4, 7:54 pm, Damien P <athe...@gmail.com> wrote:
> On Jun 3, 8:44 pm, Scott B <solar.sen...@gmail.com> wrote:
> > A HK ebay seller is doing a completeRAMPS1.4 board with 5 stepper
> > drivers and Mega for about $150 - very tempting as it would save a lot
> > of time.
> I'm surprised at the cost of these boards, I didn't expect that to be
> such a substantial part of the build.
> Same guy is now selling a batch of 10 for $1000 - that is 10x mega's,
> 10 Shields and 50 step-sticks.... basically getting the shield for
> free at that price.
> I'm tempted to email him and see if he will do a similar price for a
> batch of 5 (plus a few temp sensors - $1.50ea) - just to make sure we
> don't
> Ill take two of the board myself - have we got 3 other takers?
> On Jun 4, 7:54 pm, Damien P <athe...@gmail.com> wrote:
>> On Jun 3, 8:44 pm, Scott B <solar.sen...@gmail.com> wrote:
>> > A HK ebay seller is doing a completeRAMPS1.4 board with 5 stepper
>> > drivers and Mega for about $150 - very tempting as it would save a lot
>> > of time.
>> I'm surprised at the cost of these boards, I didn't expect that to be
>> such a substantial part of the build.
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