Smoothbore Ender & CR10 Filament Extruder Block with Threaded Coupler and Nut
thingiverse
I fell head over heels for FedorSosnin's printed Bowden Coupler and used it with great success for a good long while, but one minor issue kept nagging at me: The internal threading of the block made filament changes more challenging than I felt they should be. The filament would get stuck on those internal threads and I just couldn't see any sense in them being there, so I decided to remix the part to smooth out the filament path.
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