Has anyone tried just dousing a metal extruder in spray-on PTFE instead of inserting a PTFE tube into a metal support? This stuff [www.dowcorning.com] [www.amazon.com] Claims up to 450*F/240*C, which is basically high enough. https://reprap.org/forum/read.php?70,73839,73839#msg-73839 Sun, 19 Apr 2026 17:27:42 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?70,73839,74053#msg-74053 https://reprap.org/forum/read.php?70,73839,74053#msg-74053 www.reliableplating.com]]]> Have Blue Plastic Extruder Working Group Wed, 16 Feb 2011 21:58:55 -0500 https://reprap.org/forum/read.php?70,73839,74014#msg-74014 https://reprap.org/forum/read.php?70,73839,74014#msg-74014
Costs $47 though. You could do a lot of extruder barrels with that, but very pricey for an individual.]]> jgilmore Plastic Extruder Working Group Wed, 16 Feb 2011 12:24:13 -0500 https://reprap.org/forum/read.php?70,73839,73963#msg-73963 https://reprap.org/forum/read.php?70,73839,73963#msg-73963 [www.moldreleasenanotechnology.com]
[www.mouldrelease.com]
[www.nanomoldrelease.com]]]> makeme Plastic Extruder Working Group Wed, 16 Feb 2011 02:07:44 -0500 https://reprap.org/forum/read.php?70,73839,73852#msg-73852 https://reprap.org/forum/read.php?70,73839,73852#msg-73852
The second one is recommended for "Rubber guides, sliding doors, furniture hinges, small mechanism in office machines and sunroof seals" which sounds like just what we're looking for. I couldn't find a price though, you'd have to call you local dow corning distributor and ask.

Somebody referenced a spray-on PTFE coating sold for refinishing guns. Should also be a very durable finish, IIRC was around $35 a can.

However, according to nophead's research on the subject, the transition zone (melt zone) needs to be either short, tapered, OR slippery. I think that getting two out of three should be enough to get a rock-solid reliable extruder no matter which plastic you push through it. Getting all three would be a bonus, and I don't think can be done without some sort of spray-on coating like this. It'd be hard to get it all over the inside of an extruder barrel, but I'm sure it could be done well enough.]]> jgilmore Plastic Extruder Working Group Tue, 15 Feb 2011 01:59:15 -0500 https://reprap.org/forum/read.php?70,73839,73849#msg-73849 https://reprap.org/forum/read.php?70,73839,73849#msg-73849 NewPerfection Plastic Extruder Working Group Tue, 15 Feb 2011 01:27:16 -0500 https://reprap.org/forum/read.php?70,73839,73839#msg-73839 https://reprap.org/forum/read.php?70,73839,73839#msg-73839 This stuff
[www.dowcorning.com]
[www.amazon.com]
Claims up to 450*F/240*C, which is basically high enough.]]> makeme Plastic Extruder Working Group Mon, 14 Feb 2011 21:02:52 -0500