4mm-4mm OD PTFE Tube Coupler / Joiner
thingiverse
After review the Thingiverse site and finding only 4mm to 6mm labeled as 4mm to 4mm. I took the time to use fusion 360 and 3 attempts to build and test this. The central section will block the tube an provide a pass thru for the 1.75 filament.
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