PLA and Heat creep in Aerostruder?

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PeterT
Posts: 161
Joined: Mon Jan 04, 2016 5:50 pm

PLA and Heat creep in Aerostruder?

Post by PeterT » Mon Jun 18, 2018 9:37 am

Hi folks, I recently upgraded my Taz 5 to an Aerostruder, and things have been OK. However, I recently tried printing a model with a very large "block" of plastic (https://www.thingiverse.com/thing:2585644).

This piece takes about 18 hours to print. Mind you, my bed level and head to build plate offsets are quite dialed.

I have had 3 failures in a row. Most happen around the 50% mark, so ~9 hours in. Given how far along they are getting, I ruled out back pressure.

I'm using a fresh spool of Makergeeks standard grade PLA @ 210 deg. A little high, but I generally get good results.

Infill is @ 20% honeycomb with 3 perimeters (using S3D).

Any ideas? I;m thinking I'm getting heat creep.
Taz 5
Misumi hardened rods and bearings
Piercet Anti wobble Z-nut
Raspberry Pi w/ Octoprint and remote power control
Aerostrudder Head

Galadriel
Aleph Objects | LulzBot
Posts: 271
Joined: Mon Sep 25, 2017 10:23 am

Re: PLA and Heat creep in Aerostruder?

Post by Galadriel » Mon Jun 18, 2018 12:33 pm

This sounds like heat creep especially with PLA at 210 but it is hard to say definitively. It would help to see photos of what your filament looks like after a failure and some photos of the failed print. If this is because of heat creep you will most likely see a half moon notch has been chewed into the side of your filament.

PeterT
Posts: 161
Joined: Mon Jan 04, 2016 5:50 pm

Re: PLA and Heat creep in Aerostruder?

Post by PeterT » Tue Jun 19, 2018 1:08 pm

Images below. This object was printed @ 197c.
Attachments
IMG_6814.JPG
Taz 5
Misumi hardened rods and bearings
Piercet Anti wobble Z-nut
Raspberry Pi w/ Octoprint and remote power control
Aerostrudder Head

PeterT
Posts: 161
Joined: Mon Jan 04, 2016 5:50 pm

Re: PLA and Heat creep in Aerostruder?

Post by PeterT » Tue Jun 19, 2018 1:09 pm

images #2
Attachments
IMG_6815.JPG
Taz 5
Misumi hardened rods and bearings
Piercet Anti wobble Z-nut
Raspberry Pi w/ Octoprint and remote power control
Aerostrudder Head

Brent.I
Aleph Objects | LulzBot
Posts: 480
Joined: Mon Jan 20, 2014 8:21 am

Re: PLA and Heat creep in Aerostruder?

Post by Brent.I » Tue Jun 19, 2018 3:28 pm

PeterT wrote:
Mon Jun 18, 2018 9:37 am
I;m thinking I'm getting heat creep.
After coming across your post, we did some digging! It looks like we tested MakerGeeks PLA about 2 years ago (I thought it rung a bell), and ran into some of the same issues: http://devel.lulzbot.com/filament/Maker ... ek_PLA.odt

You can see all of the past filaments we have tested here: http://devel.lulzbot.com/filament/

One thing we note is that it prints a little bit hotter, have you tried going up to 215 or 220 to see if it helps the issue? I also noticed the hexagon infill, have you tried a standard infill?

PeterT
Posts: 161
Joined: Mon Jan 04, 2016 5:50 pm

Re: PLA and Heat creep in Aerostruder?

Post by PeterT » Tue Jun 19, 2018 5:10 pm

It failed at the higher temps initially, but since it is failing at the lower temps, I'll push it back up to where I know I've had successful prints in the past. (just not this large)

I will do two things;
- Change infill to standard rectilinear
- Tighten the idle knob a half turn.
Taz 5
Misumi hardened rods and bearings
Piercet Anti wobble Z-nut
Raspberry Pi w/ Octoprint and remote power control
Aerostrudder Head

kcchen_00
Posts: 1686
Joined: Thu Feb 19, 2015 12:42 am

Re: PLA and Heat creep in Aerostruder?

Post by kcchen_00 » Tue Jun 19, 2018 11:02 pm

Try reducing retraction also.

If you have an enclosure, open the doors or pop the top when printing PLA...

PeterT
Posts: 161
Joined: Mon Jan 04, 2016 5:50 pm

Re: PLA and Heat creep in Aerostruder?

Post by PeterT » Wed Jun 20, 2018 12:46 pm

So I got the print to finish, yay!

However, I do think my root issue was not temp, fill, or speed, but retraction. I noticed my retraction was set to 2mm. Way too much. Reduced to 1mm, and things are much more stable now.

Thanks for all the feedback. It helped me focus.
Taz 5
Misumi hardened rods and bearings
Piercet Anti wobble Z-nut
Raspberry Pi w/ Octoprint and remote power control
Aerostrudder Head

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