Prusa MK2/S/2.5/3 Y carriage 5x10 bearing conversion

thingiverse

This item was posted exclusively in response to widespread demand from the community forum page and since I would likely miss a few individuals, I decided to post it with the following disclaimers for now: A) This is still an item that will undergo significant modifications before being finalized, tested for proper functionality, reliability, and print quality. If you decide to print and test, you will be doing so at your own risk. B) You will need the following bill of materials: 9 pieces of 5x10x4mm ball bearings, 3 tubes of 5(d)mmx9.8(L)mm and 6 tubes 5(d)mmx12-14(L)mm, 6 pieces M3x10mm Buttonhead screws (NOT REGULAR ALLEN---they will hit the bed) and 6mm square nuts. C) Tune your multiplier to perfection before printing the parts, tolerances are 0.1mm or less so that with proper printing you can achieve a perfect fit. You need one regular bearing holder for the single side and the twin bearing holder printed in 2 pieces for the twin bearing side and installed in the correct direction on the carriage. After printing, drill out by hand the 5mm remaining holes. Insert the top bearing from one of the side holes and guide it to fall into place onto the top bearing location, after which you can install the two side bearings. Install the complete part on the carriage and screw from the top with the 3x10 screws, do not over-tighten, just a little tight. If you wish to have a bit of loctite on the screws, that's fine; the concept is for the build part to sit flush on the carriage so they are aligned. Install on the bed and you're all set to print. Future modifications include making the ROD entry/exit 0.1 tolerance from the rod so that no element enters the rails. I would love your feedback, so we can see if this can be implemented on all other axes as well! Enjoy! P.S.: If all testing shows proper function, I might edit the design for 695 (5x13x4) ball bearings to be even more robust, but at the moment, I don't have any available for testing.