PC4-M10 and PC4-M6 Couplers
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A simple set of couplers for PTFE tubing using two PC4-M10 and/or PC4-M6 pneumatic couplers.
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Updated at source:
Model information
- Source
- Printables
- Category
- Accessories
- License
- Creative Commons — Attribution
Updated Oct 20, 2025
Description
A simple coupler to connect two sections of PTFE tubing via two PC4-M10 fittings. I'd downloaded some to try but the threads were too large to take the couplers I have, so time to whip up my own.
The fittings I get match ISO fine M10x1.0 threading.
When used with a drybox lid that has PC4-M10 fittings I set them up with a short length of tubing that extends a bit short of halfway down the side of the spool in order to minimize feed issues and tangling. Then I can use this coupler to connect to my feed when I load it for printing.
Updates
Oct 20, 2025
- Redid threads using a proper tapered PT/BSTP threads for a better fit.
- Added PC4-M6 versions also.
- Created reusable FreeCAD model for the tapered thread.
Printing
Download either the .step or .stl versions (I use OrcaSlicer so I've been printing .step files).
Simply print vertically with a brim and clean up the supports. Designed for printing at 0.2mm layer height.
FreeCAD source file provided, as I've not messed this one up too much.
These have been tested with both a Neptune 4 Plus with 0.4mm nozzle and a Centauri Carbon with 0.2mm nozzles, and with PLA, silk PLA, and PETG.
Usage
Insert the end of one section of PTFE tubing until you see it reach the middle point. Then when connecting to the other section push that in until it seats against the first section of tubing.