It might seem counterintuitive, but sometimes you need to convert filament into pellets. This is an easy way to recycle old filament, make master batches or create custom / experimental materials. This is a work in progress... the unused 5mm insets are meant for heat-set inserts with the potential for a pellet collector and/or drill mount to be added.
The UnStruder uses the 3D printed parts from a LulzBot TAZ Single Extruder V2 to feed filament. You can print the parts from the LulzBot Source or convert an unused tool head. A 5/16" drill bit is used to chop the filament.
The UnStruder should be compatible with any Greg/Wade style extruder, but has not been tested.
1x: 3D Printed UnStruder Body
1x: 5/16" Drill Bit
2x: 608zz Bearings
LulzBot TAZ Single Extruder V2 Parts:
1x: 3D Printed extruder_body_3mm5ex_v1.3.2.stl
1x: 3D Printed extruder_idler_block_v1.4c.stl
1x: 3D Printed extruder_latch-2.0.stl
1x: 3D Printed extruder_mount_hex_v1.0.stl
1x: 3D Printed jonaskuehling_gregs-wade-ao-v3-washer-x7.stl
1x: 3D Printed lrg_herringbone_gear_v1.3.stl
1x: 3D Printed herringbone_small_gear-1.1-highres.stl
1x: NEMA 17 Stepper Motor
1x: Hobbed Bolt M8x50 26mm offset
2x: Spring, Extruder, 6mm OD, 0.8mm WD, 9.7mm FL
1x: 8mm smooth rod x 18-19mm, Stainless Steel
2x: M4 x 55 Bolt, SHCS Black-Oxide
2x: M4 Nut,Zinc-Plated Steel
2x: M4 Washer
I'm driving the stepper motor with a Pololu DRV8825 connected to an Arduino Uno, but use whatever you have lying around. The Arduino sketch is included in the files.
ABS / PLA
No support structures necessary. Printed on a LulzBot TAZ 6 with .5mm nozzle, the 608 bearings are a pressure fit and no post-processing is required.
Slide the UnStruder onto the TAZ 5 Extruder mount and attach the extruder body using two 20mm M4 bolts.
You will want to secure the UnStruder assembly prior to operation (clamping to a table works). When filament is feeding, the drill bit must be spinning. I've been using a zip tie on the drill trigger.