Notifications
Clear all

Heatbed Cable Cover Melting  

  RSS
Matticus Finch
(@matticus-finch)
Active Member
Heatbed Cable Cover Melting

Hello,

I keep having a problem with my heatbed clip. Every time I print PETG with the stock Prusaslicer settings, the cable cover on my heatbed melts or gets soft. Is there anything I can do to fix this? I don't want to keep reprinting that piece over and over. To answer the main question:

Yes, the washers are on top of the clips, not underneath, so there isn't any outside resistance.

I don't exactly, but I have a hunch as to why this is happening. PETG has a glass transition temp of 75 degrees C, and the Prusaslicer preset is 85-90 degrees. Since the cover is PETG, could that be the reason it's melting/softening? I don't want to just decrease the temp of the bed, as PETG tends to warp a little at temps below that. 

Any ideas about the cover-melting problem?

Best,

Matthew Legates

Posted : 29/03/2020 10:06 pm
stephen.f2
(@stephen-f2)
Eminent Member
RE: Heatbed Cable Cover Melting
Hi Matthew,

I have the same problem. I think it is a feature caused by using the same material to print the cover as one is printing. There will be some heat conducted from the hot bed, even if the washers are in the correct place on the bolts. After a while the plastic cover will
deform. The answer is to make a new cover from a non electrically conductive material which
can withstand the temperature.

Sadly after printing a new cover and reassembling it I managed to cause a small Nick in the thermistor wire which shorted against the live wire for the heat bed. Now I have a dead printer and, at a guess, I’ll need a new Rambo board, a thermistor and possibly a heated bed. It’s a pretty poor design really. But make sure you don’t make the same mistake.

regards,

Steve

 

 

Posted : 09/04/2020 10:45 am
Share: