Prusa multi material extruder PTFE bowden cable attachment
thingiverse
The attachments allow to put the printer in an enclosure and feed the filament from outside the enclosure to the printer. The used pneumatic fittings (e.g. https://www.aliexpress.com/item/5pcs-lot-3d-peinter-parts-Pneumatic-Fittings-PC4-M6-Bore-4-5mm-For-4mm-PTFE-Tube/32844578819.html ) still allow to quickly release the PTFE bowden cables to resolve filament jams etc. I customized it to fit the M6 threads of these fittings. I printed them using PLA and they do not require glueing to the extruder. Screwing in the fittings requires a wrench, this fit is very tight.
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