Ender 3 PTFE Coupler/Fitting Mount - Filament Guide
thingiverse
This PTFE coupler mount press fits onto the support of the Ender 3 (Pro) just above the Z axis stepper motor. It is currently designed to thread in an M10x1 PTFE tube coupler. No supports are needed when printed with the hexagons facing down. Depending on your printer, it may be difficult to thread the coupler into the front at first. Slight warping can cause issues with the threads closer to the bed. Threading it in from the back may help straighten out any messed up threads up front and make that side easier to align. Since PLA is a malleable plastic, be careful not to cross thread it.
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