Prusa MK3 / MK3S X-Axis Linear Rail Guide Upgrade

thingiverse

If you have any questions, please post here in the comments: https://www.prusaprinters.org/de/prints/16838-prusa-mk3-mk3s-x-axis-linear-rail-guide-upgrade-up Once my Y-Axis Upgrade works perfectly for me, I decided to give my Original Prusa MK3 a stiffer and more robust X-Axis Carriage. So I designed my own X-Axis Upgrade. You can follow me or watch my MK3S with Axis Mods on Twitch. https://www.twitch.tv/dasschweigenderlamer My Design works with Standard Firmware Calibration method. Easier mounting of the R4 Extruder to the new X-Axis base, no changes needed to the Extruder parts. There are two Back plates, one for the MK3/S and another for the MMU2S. I used Prusa R4 Parts as a template but redesigned it from scratch. The Design lets you choose between two versions: - You can use only a 350mm MGN12 Rail with a 45mm Block without an LM8UU. - Or you can reuse one of your existing Rods with linear bearings to make it more robust. My first tests are only with a 350mm MGN12 Rail and no Linear bearing on the existing Rod. The original Rod gives more stability to the X-Axis and helps align the parts. There's no need to cut the Rail, 350mm is a common size. It's not as easy to shorten the Profiles because of their material hardness ;-) The Guide Blocks are available in two sizes. It's essential to use the longer 45mm Block. After assembly, it's necessary to run at least the Z-Calibration. Until now, my prints with the new X-Axis have gone without any problems. Just use enough grease to avoid friction. Movements are very silent now. **What You need:** **X-Axis Extruder base:** 1x M3x10 2x M3x14 4x M3x12 Countersunk 3x M3 Square Nut 3x M3 Nut 1x MGN12 Linear Sliding Guide Block (mostly in a Set with the Rail) 1x LM8UU (optional, you can use the one of the old Bearings) **X-Axis:** 1x MGN12H Linear Rail Guides 350mm 6x M3x8 9x M3x18 1x M3x40 10x M3 Nut 1x M3 Lock Nut 3x M3 Square Nut 2x M3 Washer 1x GT2 Pulley 20 (optional, you could use the old Part, but not recommended) 4x LM8UU (existing Parts) The Rail and Rail block are available in different qualities. Just google for MGN12. My parts are from a Chinese Shop, and they cost around 15€ per Kit - it's a good Quality. No further problems, many prints are made with this setup :). Works for me so far! Update: 25.02.2020: If the Printvolume is maxed out (over 210mm), the x-back-R4CZ1.stl Part hits the original MMU2 Holder if there! The modified mart x-back-R4CZ2.stl will fix this issue (only fitted in CAD)