I created this PTFE Tubing Straightener to help straighten out PTFE tubing (4 mm outside diameter) that has been coiled up since manufacture and wants to continue to be coiled up tightly when you need it to be straight (or at least mostly straight).

I'm presenting this design as a "replacement part" because most PTFE tubing is packaged and shipped so tightly curled up that it is pretty much useless until it is re-trained to remain straight. My PTFE Tubing Straightener does just that!

This PTFE Tubing Straightener works by holding the tubing firmly in place at both ends (at least) for a period of time to allow the tubing to adjust to being straight. Up to 6 PTFE tubes can be straightened in each set of clamps. The length of the tubing is only limited by your own space. Simply screw two or more straightening clamps on a flat surface (such as a wall) and insert up to 6 PTFE tubes in the individual clamps. Then leave the tubes there until you're ready to use them or until they no longer curl up.

These PTFE Tubing Straighteners can also be used to organize and secure the PTFE tubes between your 3D printing devices.

If you have a Prusa MMU2 or MMU3 (Multi Material Upgrade), a Bambu Lab AMS (Automatic Material System), a dry box, or any type of filament feeding system for 3D FDM / FFF printers, then you surely also have a supply of PTFE tubing on hand for replacement when the tubes wear out. Keep spare PTFE tubing for your 3D printer's multi-filament feeding system in a set of PTFE Tubing Straightener clamps so that they can be put to use as soon as you need them!

The provided STL file is intended to be printed in PLA (though PETG, ASA, or ABS should also work fine) and does not require supports.

A PrusaSlicer 3MF file is provided for generic PLA, and a G-code file is provided for the Original Prusa MK4.

A STEP file is also included for those wishing to remix the design.

The PTFE Tubing Straighteners seen in the photos were printed on an Original Prusa MK4 in FilaCube Green PLA with a 0.4mm nozzle at 0.3mm layer height with a 15% gyroid infill.