Filament Drybox Tap(1.75mm) with PC4-M6 fittings and cover holder

prusaprinters

This remix of the excellent design by dottom22 includes these modifications: Resized the threads so that the hole you need to cut in the enclosure is only 20mm dia, instead of 22mm. That fits the largest diameter of my stepped drill bit. Replaced one of the "nubs" which provide grip for tightening with a peg to store a 4mm ID thread protector when the filament on that tap is in use. The thread protector covers the end of the Bowden tube when the tap is idle. As with the original design, the PC4-M6 (AKA Bowden) fittings are friction fitted, and rely on deforming the plastic when you thread them in. You can cut your own gasket for a better seal out of craft foam or similar material if you use the tap with the flat back. I have tested the fitment of the tap with the relief for an O-ring and it works pretty well, IMO. Fittings: Use PC4-M6 Pneumatic fittings. Example - https://smile.amazon.com/dp/B01MQYJ9T6/ref=cm_sw_em_r_mt_dp_Q01JBCNPM4S8WTZTAWXS?_encoding=UTF8&psc=1 Caps for bowden tube: 4mm Inner Diameter Thread protectors. Example - https://smile.amazon.com/dp/B07T9TGWR5/ref=cm_sw_em_r_mt_dp_947NZ0BSN73PXZNZ36RT?_encoding=UTF8&psc=1 O-rings (optional): 25mm OD, 20mm ID, 2.5mm Width. Example - https://smile.amazon.com/gp/product/B07FRBQC5L/ref=ewc_pr_img_4?smid=A1THAZDOWP300U&psc=1 Category: 3D Printer Accessories