Yea Nylon is kind of mushy that way. Never liked working with nylon but it is a material of choice for rugged applications.

The Alloy 910 looks interesting. They don't give out much on the true composition but definitely a material I would like to try.
Nothing too scary about the description and FDA approvals are a nice touch.

One reason I was looking toward Delrin is the toughness. Basically engineering rod stock has excellent lubricity and excellent wear characteristics.
I use machined Delrin for recumbent idlers and have not worn one out yet with over 10,000 miles of all weather riding.
And on a recumbent trike, it has a significant load put on it.
I'll stick with machining Delrin. Easy enough to work with.

Nylons are a different class all together in my book. Thanks for the information. It will certainly come in handy.

My printer uses an internal heater that warms the chamber to 60C blowing directly under the build plate. The build plate gets toasty.
And it is a direct drive feeder so no worries there... and it has a fixed small nozzle at 0.35mm. 260C is not an issue in the least.
I just won't run materials with particulates. That is just asking for trouble.

Have you tried warming a tap and using some mineral oil as lube? Say 100-120C either chasing the threads or a new thread?
Basically a recast and anneal on-the-spot temperature range.

This is good info indeed! Thanx