Ender 5 plus Belt Driven Z-Axis Mod

thingiverse

The 20t to 80t pulley gear reduction. This eliminates the need for a worm gear for gear reduction which eleminates backlash and reduces cost. I tried 20x60t pulleys but the gear reduction wasn't enought to keep the bed from falling. The 80t gt2 pulleys keep it from falling but it still drops a small amount and loses position on power down. My goal is better print quality and I'm not worried about power outages. I think I have a way of making it work but I haven't fleshed it out yet. !!!Must Read!!! You must use this mod https://www.thingiverse.com/thing:3890803 to raise the 5 plus bed up to make clearance for the bracket that connects the belts to the bed and make room for the top pulley bracket. Z movemet will be reduced to about 370mm. I don't see a way around this loss without redesigning the entire bed-frame structure. Your thoughts are appreciated regarding this problem. Parts: The original motor mounts are used but orientation is changed. **All parts are 5mm bore** 2x M5x50 4x M5x30 4xGT2 20tooth 2x200mm timing belts 2xGT2 60tooth 2xGT2 toothed idler pulley 4xsmooth idler pulley zip ties 4x608 bearings. I know 605 would be better but I used what I had. To fit in the included file the bearing needs to be 22mm outer diameter. Print the bushing to adapt to 5mm. 5 meters of gt2 6mm belt. short M5 bolts and t_nuts for mounting parts to 2020 extrusions Here are the links to some parts. https://www.amazon.com/dp/B07JKT5BZQ?psc=1&ref=ppx_yo2_dt_b_product_details https://www.amazon.com/dp/B07C6FL8TW?psc=1&ref=ppx_pop_dt_b_product_details https://www.amazon.com/Pulley-Synchronous-Wheel-Timing-Printer/dp/B08JTS1DRK/ref=sr_1_4?crid=3GA71TM049RUD&keywords=80t+gt2+pulley&qid=1638826981&sprefix=80t+gt2%2Cindustrial%2C149&sr=8-4 https://www.amazon.com/BIQU-Aluminum-Toothless-Timing-Printer/dp/B01H3F8LUU/ref=sr_1_3?keywords=smooth%2Bidler%2Bpulley&qid=1638827467&sr=8-3&th=1 https://www.amazon.com/3Dman-Timing-Closed-Rubber-Printer/dp/B07V6N32B1/ref=sr_1_3?keywords=200mm+timing+belt&qid=1638827657&sr=8-3 !!! Because of the orientation of the motors they need to run in opposite direction from each other! The standard creality board has a dual z driven by a single stepper as does the skr mini e3v2 and the Skr2. I assume you will have to rewire one stepper to run opposite. I have 2 z drivers and just reversed one in klipper. !!! I have it printing now and it is really smooth! With the standard motors the rotation distance is 10.15 in klipper but calibrate it yourself to double check!