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PETG - The extruder and the P.I.N.D.A. holder melting  

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Nemikan
(@nemikan)
New Member
PETG - The extruder and the P.I.N.D.A. holder melting

I've had the printer for about 1-2 weeks and am working on printing backup replacement parts using Prusament PETG. Only previously printed with Prusament PLA so far, and don't really plan to print using other materials. I'm using the recommended temperatures on the Prusament PETG box in the PrusaSlicer for generating my gcodes.

I've been browsing and looking at which parts are the most likely to go bad, and been reading about issues w/ the extruder holder on the PINDA melting. I've just checked out my printer and it seems the plastic connecting the PINDA mount to the fan has split, and will most likely cause the PINDA to be at an inconsistent height. Is there a recommended part that I can either buy that's won't be susceptible to melting (maybe a metal bracket to screw on?) or some other extruder that's seems to be a solution to the problem? I'm kind of confused at how the whole extruder is made with PETG yet it not expected to melt at all when printing the same material? 

I've browsed around and found a few posts, but all look like about a year old, not sure if Prusa has officially made a solution and I assume I have the latest as my printer is brand new. I know many people have created alternate extruders, but for now I'm still a total noob so I'm not confident enough to mod my printer with such a foundational part this early on.

Other links of the issue, potential resolutions I've found:
https://www.reddit.com/r/prusa3d/comments/dhblzz/mk3s_pinda_probe_melted_how_to_patchfix_it/
https://www.thingiverse.com/thing:3777954
https://www.prusaprinters.org/prints/28409-prusa-i3-mk3s-optimized-airflow-and-pinda-securing

This topic was modified 1 year ago by Nemikan
Posted : 16/11/2020 5:14 am
cwbullet
(@cwbullet)
Illustrious Member
RE: PETG - The extruder and the P.I.N.D.A. holder melting

Do I understand that the parts are printed with PLA and are melting when you try to print PETG?  

This is expected if so.  

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Chuck H
3D Printer Review Blog...
Posted : 24/11/2020 12:30 am
Print My World
(@print-my-world)
Eminent Member
RE: PETG - The extruder and the P.I.N.D.A. holder melting

The sagging probe was an issue with extruder version R4, that has been addressed in R5 with reinforcements around the probe.

The whole extruder can be made of PETG because the only portion that reaches the printing temp of PETG is the heat block and nozzle. If you look at the extruder, it doesn't actually touch those parts, rather clamps around the fins. The temp falloff is proportional to the distance away from the heat source. You can try a silicone sock to insulate your heat block from the surrounding plastic.

You can also try the probe reinforcement which was just posted. https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-user-mods-octoprint-enclosures-nozzles-.../modded-hot-end-mounting-parts-to-conteract-pinda-sag-and-fan-sag/#post-298699

Posted : 24/11/2020 12:43 am
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