PTFE tubes: to cut, or not to cut? - Assembly and first prints troubleshooting https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/ Prusa3D Forum Discussion Board en-US Wed, 20 May 2026 09:52:11 +0000 wpForo 60 RE: PTFE tubes: to cut, or not to cut? https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-738238 Wed, 26 Feb 2025 10:23:18 +0000 I left the ones between the buffer and MMU3 untouched. 

I ordered some extra PTFE tubing and a cutter (it's very cheap) from AliExpress and used that for the lengths between the spools and buffer, since they differ according to my spool placement - so some longer then others. Packed the original ones away in a box just in case I need them in future. 

]]> Assembly and first prints troubleshooting iftibashir https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-738238 RE: PTFE tubes: to cut, or not to cut? https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-737513 Fri, 21 Feb 2025 14:49:31 +0000 I had to cut mines because of space limitations where I have the printer, so the whole assembly is more compact.

No problems. I've used a sharp knife.

]]> Assembly and first prints troubleshooting Rui Guerra https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-737513 RE: PTFE tubes: to cut, or not to cut? https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736769 Sun, 16 Feb 2025 20:06:04 +0000 If you cut one, and try it, you can still print a joiner sleeve and repair it if necessary 
I cut the tubes on my MMU2 and it worked better... 
regards Joan

]]> Assembly and first prints troubleshooting JoanTabb https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736769 RE: PTFE tubes: to cut, or not to cut? https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736728 Sun, 16 Feb 2025 14:00:03 +0000 Thanks.
I'll follow your advice.

]]> Assembly and first prints troubleshooting Nick_Hacking https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736728 RE: https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736686 Sun, 16 Feb 2025 02:09:00 +0000 Get a tubing cutter, don't use scissors.  It'll leave a damaged end on the tube.  They are only a few dollars. 

As far as if you should cut them I have no idea as I didn't have an MMU.

]]> Assembly and first prints troubleshooting Brian https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736686 PTFE tubes: to cut, or not to cut? https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736652 Sat, 15 Feb 2025 21:34:38 +0000 Dear Experts,

I'm in the final stages of putting together my MK4S with the Original Enclosure and MMU3.
Many of the flexible PTFE tubes that are to carry filament from the spools to the cassettes seem to be very long and would be neater if trimmed.

With cutting being an irreversible operation, I thought I'd seek advice before getting the scissors out....  Should I?

]]> Assembly and first prints troubleshooting Nick_Hacking https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-assembly-and-first-prints-troubleshooting/ptfe-tubes-to-cut-or-not-to-cut/#post-736652