PTFE Spacer Filament Circular Guide Wheel
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A circular guide that can be used with 4mm PTFE to go in any direction along a circular path
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Insert your 4mm PTFE tube in as many of the holes on the perimeter as you like and use this to add an even bend to the tube to reduce friction and help guide it in the direction you intend. The diameter is 132mm. (Note that I have also have desigend a new part that is a large arch that routes all five PTFE tubes -see link below)
I have also added an optional clamp that you can print to attach the ring to the polybox PC4M10 connector to hold the ring in position better so it doesn't wiggle around. The clamp needs some M3 hex screws and nuts. I am using an M16 and M20. Depending on how tight you clamp it you can control the movement.
I can see someone using this guide any place along the filament path where you want to control when and how much of a turn to make.
I designed this to help route some particularly rough filament to my MMU. I am able to use a slot buffer with the rest of my filament but this particular cheap stuff is grainy and the path introduced too much friction, so I used an air buffer instead just for this one spool using this ring. It comes out of a polybox PC4M10 insert that I remixed ( https://www.printables.com/model/416215 ) and have shared as well, and then rounds this circle guide going through a few of the holes. There is then a gap in the PTFE before the MMU to act as a buffer area for the filament retraction. This worked so well I moved all my filament out of the slot buffer to this air buffer method instead.
This is only one example of how this circle guide could be used. Note that in my implementation.
Please put black electrical tape around the plastic wheel at the bottom so it doesn't scuff the top of the polybox plastic as it wiggles.
Printed with black PETG .25 layer height 3 perimeters. No supports.
My Polybox mods:
New! - MMU PTFE large arch combines 5 of these into one part https://www.printables.com/model/434655
Strain relief circle for PTFE tube routing from Polybox
https://www.printables.com/model/418131
(includes a clamp that works with the item below)
PC4M10 Adapters with 1mm threads for Polybox holes:
https://www.printables.com/model/416215
PTFE tube with PC3M10 1mm threaded top frame 'Fishing Rod' connector for MK3S printer
https://www.printables.com/model/428973
MMU2S 'Viking Boat' Rear PTFE tube curved connector for 5 PTFE tubes
https://www.printables.com/model/428281