Linear rods on Y - Ender3max and ender3 series with 4040 Y extrusions

This was only tested on an Ender3Max Neo (with about 305mm of printable surface on Y out of the 320mm bed) ender3max Neo can sometime be found rather cheap refurbished ( https://www.ebay.com/itm/355169345340 this is where I got mine from, out of stock now, but keep an eye on it if interested in that size bed ) Compatible with ender3pro/3v2 but untested, there is some Y space lost, not exactly sure how much, but I would guess about 20mm or so , be careful and consider it alpha , as the end stop is untested, you may need to slide the rear rod mount forward if using senseless homing so that it hits the rod mount before the bed hits the motor (depends on the size of motor) — I also included a tweaked Y motor mount that allows securing an end stop to its side. Original Ender3 with 4020 Y extrusion isn't compatible (sorry), but compatible with ender3pro,3v2, etc ------ the STEP files has additional parts that are functional, but were older iteration of the parts (like rod mount with 1 t-nut instead of two and slimmer profile, the exported STL are the sturdier final version of those parts) warning: the end of the rods are really sharp they likely won't do deep cut, but they can easily do small cut that may go unnoticed initially, happened twice — I included end caps for handling them, or pushing them in from one side, also useful when greasy to keep hands clean-ish Huge thanks to WesSnipes711 (discord) for helping with this and going down the rabbit hole of a rod based setup Hardware: (2) 12mm Linear Rods 500mm on e3max, 350mm~360mm on e3pro/3v2 (3) LM12UU Bearings, up to x6 in e3max, up to x4 in e3pro/3v2 (2) M5x12 SHCS (Tensioner) (4~8) M5x8 SHCS (Rod Mounts) (4~8) M5 T-nuts (Rod Mounts) (4) M4x12 SHCS (Rod Clamps) (4) M4 Hex Nuts (Rod Clamps) (4) M3x8 SHCS (Bearing Clamps) (4) M3x4x5 or M3x4x4.6 Heat Inserts (Bearing Clamps) Stock: (6) M5x30 BHCS & Lock Nuts (Bearing Clamps/Bed Carriage) Printed Parts: Tensioner 6 walls, 6 bottom, 6 top, 60% infill Rod Mounts (Endstop & Back-Left) 11 walls, 6 bottom, 6 top, 80% infill Bearing Clamps 4 walls, 4 bottom, 4 top, 40% infill Bottom Dual, Bottom Single, Top (Separate or connected) Installation: 1) Secure Rod Mounts (M5x8 SCHS w/ T-nuts) & Tensioner (M5x12 SCHS) to extrusion 2) Guide 12mm rods through mount holes on Tensioner and slide appropriate LM12UU bearings (1 left/2 right) onto rods before guiding into back Rod Mounts (don't tighten Rod Clamps yet) 3) Place Top Bearing Clamp(s) onto bearings and snap into place 4) Insert (6) stock M5 Lock Nuts & (4) M3x4x5 Heat Inserts into Bottom Bearing Clamps, snap onto bearings, and secure to Top Bearing Clamps with (4) M3x8 SHCS 5) Secure Bearing Clamps assembly to Bed Carriage with (6) stock M5x30 BHCS 6) Secure Rod Clamps at back and on tensioner with (4) M4x12 SHCS & Hex Nuts