I remixed this from the design by BuzzKillBillZ on Printables. I made it using my own settings on a K2 Pro. This design uses a router bit as the main cuter. Has support bearings on both ends of the cutter for added support and tool longevity. Uses a small cheap stainless steel ruler as a surface for the cutter to cut against. Without this ruler the plastic wears down fast and will not be able to cleanly cut the plastic. The M3 bolts on the side are used to hold the ruler in place and to adjust the depth or closeness of the cutter to the ruler. The outer two hold the ruler in place and the middle three adjust the depth. You need this gap between the cutter edge and the face of the ruler to be as small as possible without making contact. I tested multiple M3 bolt lengths and ended up using M3x12mm. The large flat lip is there to bolt or clamp the shredder to a table or counter. I used a corded power drill to spin the cutter. See pictures for drill details. To get the plastic pieces small enough to fit inside the shredder, I used a pair of tin snips or wire cutters. A large hammer also works well.

For the main body print orientation , you need to print it on its side where the hole for the router bit is pointing straight up (the position the model is by default). This does two things. First, it keeps the holes/pockets the bearings fit in perfectly round and consistent. Second, it keeps the forces from pushing across the layer lines and causing a potential blowout where the metal ruler is. All models are to be printed in their default orientation after loading them into your slicer.

Non 3D Printed Parts (non-affiliate Links):

* Ruler Metal Straight Edge Ruler Stainless Steel Ruler 6 Inch Ruler …: https://www.amazon.com/gp/aw/d/B07R8LWDGP?psc=1&ref=ppx_pop_mob_b_asin_title

* Yakamoz 2Pcs 1/4’’ Shank Top and Bottom Bearing Guide Flush Trim Pa...: https://www.amazon.com/gp/aw/d/B07WW39K4N?psc=1&ref=ppx_pop_mob_b_asin_title

* uxcell Knurled Insert Nuts, 120Pcs M3 x 10mm L x 5mm OD 3D Printing…: https://www.amazon.com/gp/aw/d/B0CB8KHW7X?psc=1&ref=ppx_pop_mob_b_asin_title

* uxcell R4AZZ Deep Groove Ball Bearing 1/4-inchx3/4-inchx9/32-inchSh…: https://www.amazon.com/gp/aw/d/B0824W4SZW?psc=1&ref=ppx_pop_mob_b_asin_title

My Print Settings (Your mileage may vary):

* Material: Creality Hyper PLA

* Nozzle: .4on K2 Pro

* Layer Height: .2mm Thick

* Walls: 4mm Thick

* Top/Bottom: 4mm Thick

* Infill: 50%

* Supports: Yes

micro shredder

Micro Filament Shredder

0.2mm layer, 4 walls, 15% infill

Original