808 Adjustable Idler Pulley for Tevo Little Monster

thingiverse

It's about time to do some maintenance on the Little Monsters and have been toying with revisiting the idea of improving the idler pulleys. The last attempt was the [needle bearing pulley](https://www.thingiverse.com/thing:2794443). Of all the components on the printer, the bearings on the idler pulleys are rather weak and require regular replacing. I have a box full of robust, inexpensive 808 bearings remaining from the fidget spinner craze, so why not whip up a design using them. Now for REAL, **No more crunchiness**! What is needed: (3) 808-pulley-bot-v6.stl (3) 808-pulley-mount-v6.stl (16 or 20 for length of screws available) (3) 808-pulley-top-v6.stl (3) [M5x30mm Thumb screws](https://smile.amazon.com/dp/B08SBW8R4F/ref=cm_sw_em_r_mt_dp_9B8BH8RAY0DS0ZBF3JQM?_encoding=UTF8&psc=1) (Note: if you purchase 10, you can use 3 on the heated bed along with [compression springs](https://smile.amazon.com/dp/B005KV6PMG/ref=cm_sw_em_r_mt_dp_K5XZX8F0GD2QRRW6A9MP) for that leveling tweakyness) (3) M5 nuts (12) M4x20mm hex bolts (6) M4 nuts (6) M4 T-slot fasteners (reuse the stock ones) (6) 808 bearings (3) 15-19 mm segments from a 5/16" rod of your choosing ([example](https://www.menards.com/main/hardware/sheet-metal-rods/hillman-reg-steel-solid-round-rod/11152/p-1444432411732-c-9215.htm)) Optional Parts: (3) [3mm x 12mm magnets](https://smile.amazon.com/dp/B07MYQV446/ref=cm_sw_em_r_mt_dp_BQYRKYJ667HXX2CEFV1Z) (1) pulley-jig.stl - by sliding the rod into the hole, you can pinch while using a hacksaw in the guide to cut ~16mm segments. Also is helpful with installation in the track by inserting the tabs in between the t-slot mount and pulley.