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Trouble printing nylon on a petg raft  

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Jeffrey Benson
(@jeffrey-benson)
Eminent Member
Trouble printing nylon on a petg raft

I've been trying to print a timing belt pulley with a large flat surface, using bare nylon, but it keeps lifting.  I tried printing the nylon of a petg raft, but the nylon pulls away from that as well.  I've got a sealed enclosure, and the nylon is very dry and fed directly from a dehydrator.  My z-height, temps, flow, etc...are all good and I've tried various adjustments in an attempt to make it stick.

Can anyone give this model a shot and see if I can get help printing this.  

MatterHackers Nylon Pro on Prusament PETG

Is it possible that there are lubricants on the Prusament PETG causing the nylon to break free?

Posted : 21/04/2024 3:55 pm
Jeffrey Benson
(@jeffrey-benson)
Eminent Member
Topic starter answered:
RE: Trouble printing nylon on a petg raft

For some reason my model isn't uploading

https://drive.google.com/file/d/1OJTtnU6FOFEK0RwKqDM7pJXWIuBc5mWH/view?usp=drivesdk

 

Posted : 21/04/2024 4:01 pm
EastMemphis
(@eastmemphis)
Estimable Member
RE: Trouble printing nylon on a petg raft

Nylon has a pretty high shrinkage and a high temperature for printing. That leads to stresses when different parts of the print are at different temperatures.

Nylon pretty much needs a temperature controlled enclosure to be successful on anything but small prints.

Printables: https://www.printables.com/@EastMemphis_905139/models

Posted : 21/04/2024 8:06 pm
Jeffrey Benson
(@jeffrey-benson)
Eminent Member
Topic starter answered:
RE: Trouble printing nylon on a petg raft

 

Posted by: @eastmemphis

Nylon has a pretty high shrinkage and a high temperature for printing. That leads to stresses when different parts of the print are at different temperatures.

Nylon pretty much needs a temperature controlled enclosure to be successful on anything but small prints.

The enclosure sits around 100°f just from the bed and hotened, but I've got a micro heater that I use to preheat the case.  I can use that to raise the temps.  Are the Prusa components (board, motors, etc...) okay at higher ambient temps?

Posted : 21/04/2024 8:16 pm
EastMemphis
(@eastmemphis)
Estimable Member
RE: Trouble printing nylon on a petg raft

I think the max temp for the electronics, and everything else is 38C.

Printables: https://www.printables.com/@EastMemphis_905139/models

Posted : 22/04/2024 1:52 pm
Jeffrey Benson
(@jeffrey-benson)
Eminent Member
Topic starter answered:
RE: Trouble printing nylon on a petg raft

I gave up and went back to using Overture Easy Nylon, which is a petg/pa mix (I believe).  It prints really well and seems as strong as bare nylon AFAIKT.  The only reason I've got to go back to nylon is because NinjaTek stopped selling Armadillo 95d TPU 😫 

Posted : 22/04/2024 3:40 pm
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