A direct drive bowden extruder for 3mm

thingiverse

I've built a direct drive bowden extruder that's designed specifically for 3mm material, as well as MK8 style hobbed pulleys. My SketchUp design is incredibly versatile because it can be completely customized to fit just about any type of hobbed pulley out there. For this build, I'm using a super common 13x8mm brass hobbed pulley with a 5mm bore, since it was super easy for me to get from Fabber-Parts.de in Germany. The parts needed are as follows: • 1 x Nema 17 stepper motor • 1 x 13x8mm hobbed pulley with a 5mm bore (you could also use other similar pulleys) • 1 x push-fit bowden connector that's got a 5mm OD • 1 x 608 zz bearing • 1 x M8x15mm threaded rod • 2 x M4 washers • 1 x M5x10mm head screw • 3 x M3x8mm head screws • 1 x M3x30mm head screw • 5 x M3 washers • 2 x 4mm ID compression springs • 2 x M3x50mm head screws that have a suitable length for the chosen spring • 2 x plates made out of aluminium, each measuring 6x3x30mm with pre-drilled holes and threads