Weird extrusion problem

[Refractix]

My extruded plastic is doing something quite strange that I can't
quite figure out...
Once the extrusion is started all seems well but it slowly begins to
"kink" more and more.
Here's a video because I can't quite explain it that well.

http://www.flickr.com/photos/refractix/4672618392/in/set-72157624210041288/?processed=1&cb=1275765420068

My temperature is set at 220c and I'm using a Makergear Heatercore.
What in the world could be causing this?

And one more question.
I've been having trouble with an overheating mosfet when using my
heated build platform (like many people have).
I cut a piece of the heat sink off a video chip and stuck it onto the
mosfet with a bit of thermal paste and it seems to be working, though
it still gets pretty toasty.
If i were to take the relay route which relay would i need to get? If
someone could point me in the correct direction that would be great.

[Rick Pollack]

When I encounter kinking it generally means that it is running too hot. Make sure your heatcore is tight against your nozzle and getting good thermal contact and that you have the correct thermistor values.

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[Jeremy Ruhland]

This is the relay I use: http://www.mouser.com/ProductDetail/Tyco-Electronics/OUDH-SS-112D000/?qs=YjZJnJrCSBTSucpRbkPJRA%3d%3d
But just about anything that can take 12v and several amps should do the trick.

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[Refractix]

How would I know if I have the correct values? I'm using the modular
thermistor kit and have the recommended values for the normal makerbot
setup.

On Jun 5, 4:35 pm, Rick Pollack <r...@makergear.com> wrote:
> When I encounter kinking it generally means that it is running too hot. Make
> sure your heatcore is tight against your nozzle and getting good thermal
> contact and that you have the correct thermistor values.
>
>
>
> On Sat, Jun 5, 2010 at 3:58 PM, Refractix <refrac...@gmail.com> wrote:
> > My extruded plastic is doing something quite strange that I can't
> > quite figure out...
> > Once the extrusion is started all seems well but it slowly begins to
> > "kink" more and more.
> > Here's a video because I can't quite explain it that well.
>

> >http://www.flickr.com/photos/refractix/4672618392/in/set-721576242100...

>
> > My temperature is set at 220c and I'm using a Makergear Heatercore.
> > What in the world could be causing this?
>
> > And one more question.
> > I've been having trouble with an overheating mosfet when using my
> > heated build platform (like many people have).
> > I cut a piece of the heat sink off a video chip and stuck it onto the
> > mosfet with a bit of thermal paste and it seems to be working, though
> > it still gets pretty toasty.
> > If i were to take the relay route which relay would i need to get? If
> > someone could point me in the correct direction that would be great.
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "MakerBot Operators" group.
> > To post to this group, send email to make...@googlegroups.com.
> > To unsubscribe from this group, send email to

> > makerbot+u...@googlegroups.com<makerbot%2Bunsubscribe@googlegroups.c om>
> > .

[Refractix]

Well I guess since my heated build platform and extruder temps are
identical at room temp, they're both correct. Should I back the temp
down a bit?

> > > makerbot+u...@googlegroups.com<makerbot%2Bunsubscr...@googlegroups.c om>

[Rick Pollack]

what value are you using? i normally use 4066. yes, try 210C and see what happens...

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[peterr]

i blogged about how i built my HBP with a relay...
it has a diagram that explains the connections 'visualy'...

http://makerbotknowledge.blogspot.com/2010/05/makerbot-heated-build-platform-build.html

i went to an auto parts shop and get a 12V-30A relay... (they're
usualy used in car horns)...
cost me not a cent more then 5euro...
i reckon you can get away with a 12V-10A aswell... but i'm pretty sure
that in any part of the world in any auto parts shop you'll find those
relays...
usualy the numberings are the same also...

my HBP and printhead actualy rarely have the same temperature...
i once forgot to connect the (3wire) grey cable to the extruder head
and spent 30min breaking my head why the hell both my extruder and HBP
kept showing the same temp - while my HBP wasn't getting hot...

Peter

----------------------------
makerbotknowledge.blogspot.com

[Refractix]

Thanks! I was looking for some kind of visual aid on the wiring.

I managed to get the extrusion to stop kinking by lowering the temp to
about 113 so thank you everyone for the help!

On Jun 6, 10:14 am, peterr <klin...@gmail.com> wrote:
> i blogged about how i built my HBP with a relay...
> it has a diagram that explains the connections 'visualy'...
>

> http://makerbotknowledge.blogspot.com/2010/05/makerbot-heated-build-p...

[Jordan Miller]

if you downgrade to 1.6/1.8hbp firmware your HBP MOSFET will no longer overheat. It's something wrong with the 2.x firmware I think, or has to do with tuning the PID loop for the HBP different from the extruder.

jordan

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[ddurant]

> I managed to get the extrusion to stop kinking by lowering the temp to
> about 113

Er.. 113C?

I hope that's a typo...

> > > > > >http://groups.google.com/group/makerbot?hl=en.- Hide quoted text -
>
> - Show quoted text -

[Joel Chia]

That did work for me. The only 2 solutions that worked for me was adding a heatsink or using a relay (and I now have both since I tried the heatsink first but added the relay anyway since I had one on hand incase the heatsink didn't work).

1.6/1.8hbp did however fix the comms errors (between mb and extruder) that I was having.

Cheers,
-Joel

[Thomas Charron]

On Sun, Jun 6, 2010 at 7:56 PM, ddurant <ddur...@gmail.com> wrote:
>> I managed to get the extrusion to stop kinking by lowering the temp to
>> about 113
>
> Er.. 113C?

I assumed that meant, 213. :-D

--
-- Thomas