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PINDA broke redundantly due to warping ABS  

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molymp
(@molymp)
New Member
PINDA broke redundantly due to warping ABS

I recently built an enclosure to be able to print ABS. This worked fine for ~ 100 print hours (stable temperature ~42°C). But during the last print, one part on the bed began to warp.

As a result, the PINDA mounting and the parts fan duct broke as well as the PINDA itself broke (the plastic tip was ripped off and was melted into the ABS part...).

Luckily I did print the relevant parts a few weeks ago so I was able to repair this part. Fun fact: the next print would have been: Fan duct in ABS 😉

For the PINDA, I was able to extract the tip from the ABS and just placed it back to the metal shaft.

With that I hoped that I may print again. But when I tried to run the self-test and re-calibration, I got an error message. After the (successful) fan test, the z-axis was moved ~ 1cm up and then the test stopped with "Selftest error! Please check: Endstops / Wiring error Z".

I already placed an order for a new PINDA but would like to get a better understanding 
1) If this error message indicated a broken PINDA or if I may expect another issue,
2) How exactly the PINDA is set-up, what exactly is broken, if I have a chance to repair it
3) How I may avoid this in the future. I mean, I cannot 'prohibit' ABS from warping, but maybe there is already a good idea for e.g. a 'PINDA self rescue' mechanism? 

Anyone else who had a double-broken PINDA issue?

Posted : 04/07/2020 9:00 am
molymp
(@molymp)
New Member
Topic starter answered:
RE: PINDA broke redundantly due to warping ABS

If you ever wondered: this is what a PINDA looks like from inside 😉

Not sure what's inside the tip and if 'it' was connected to the small pcb other than by the glue...

Posted : 04/07/2020 9:59 am
Peter M
(@peter-m)
Noble Member
RE: PINDA broke redundantly due to warping ABS

The extruder can only cool enough till 35C degrees, if you enclosure gets hotter, you need to cool a little.

And the pinda holder I would print in ABS, and/or search for a stronger part if somebody already made one.

A extra cooler on top of extruder I would also do(see thingiverse), you have a enclosure, the extra fan i would do it will cool the motor very good.

Printer is not made for in a enclosure so keep checking temps.

This post was modified 4 years ago by Peter M
Posted : 05/07/2020 10:02 am
molymp
(@molymp)
New Member
Topic starter answered:
RE: PINDA broke redundantly due to warping ABS

@peter-m26

Thanks, did not know that detail with 35°C. I already moved the PSU outside the enclosure and have an additional heatsink on top of the extruder - only by intuition, now I know why...

To be very open, I only need the Prusa to print ABS until I have all parts for my VORON complete 😉 Later it would be dedicated to PETG and PLA only.

For checking the temperature, I have an Arduido-based temp control that would open a small lid with a servo when 45°C are reached - did not happen so far. Do you suggest to hold the temperature at 35°C? I read that 45-50°C would be better for ABS prints.

Posted : 05/07/2020 12:17 pm
Peter M
(@peter-m)
Noble Member
RE: PINDA broke redundantly due to warping ABS

If printing works you can leave it how it is, if have none filament melting higher up in the extruder, a little higher is possible no problem.

 

Posted : 05/07/2020 4:28 pm
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