Tapered thread bowden coupling PC4-M6
thingiverse
This is a printed part for Bowden Coupling PC4-M6 used on Ender 3 Extruder. First, you need to remove the plastic pieces (excluding the rubber piece) inside the PC4-M6 Bowden coupling that came with the printer. This coupling is notorious for its poor grip of the Teflon tube, so it's essential to address this issue. Next, apply high-quality epoxy glue inside the printed part where the PC4-M6 will go in (refer to the pictures provided). In my case, the epoxy took two days to fully harden before I could install the piece on the extruder. Now, the piece is securely mounted and holds up remarkably well.
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