BondTech Mini Extruder with PC6-M6 fitting for 2.85 mm filament

thingiverse

In (re-)using 2.85 mm filament from my Ultimaker 3E for my home built printers, I needed a small Extruder opposed to the previous designs, https://www.thingiverse.com/thing:2897762 and https://www.thingiverse.com/thing:2758025. This design usesa Trianglelab dual drive gear kit cloned from BondTechech for 2.85/3.0 mm filament having an inner diameter of 8 mm. The extruder design is inspired/based on the original/former free Bondtech Mini extruder design, but is completely redrawn from scratch. The design includes a belt reduction of 2:1 (20 teeth pulley with a 5 mm shaft diameter and a 40 teeth pulley with an 8 mm shaft diameter) and a GT2-110 6 mm closed loop belt. Inside the parts 2 bearings (F688ZZ 8x16x5 mm) are used to secure the 8 mm shaft (made from a linear guide rail). To secure the Bowden tubes (not shown in the photos, but sized: 6 mm OD and 3 mm ID), PC6-M6 tube connectors are screwed into the top housing. An overview of the parts is given, it includes some 35 mm Allen key bolts to secure the top and bottom housing to the stepper mount (requires 4 M3x5x5 mm brass knurled inserts). A standard metal NEMA17 stepper mount is used to attach the complete assembly to the aluminium extrusion profiles. Yellow PLA is used for the images, the end product is printed in black ColorFabb PETG.