i3 X Axis Linear Rail System

thingiverse

While usable, this is still a WIP I designed this to replace the 8mm smooth roads on my Hesine m505 with 400mm MGN12 linear rails and 10mm wide belts. This design incorporates a floating X axis idler to help reduce Z wobble artifacts. Currently it is using an old fan duct design and it is also compatible with my Z endstop adjuster. I will later update this for use with 450mm rails (what I should have ordered), and different pulley sizes. Note that this is for printers with a spacing of 22mm between lead screw and smooth rod centres. LM10 version now availiable. 2016/11/15 Now with even more overkill. SFU12 ballscrews and LM10 smooth roads. BOM; mk8 extruder idler, spring and supplied M3 bolts. 2x 400mm MGN 12 linear rails and 2x H (long) blocks. 16/20T 5mm bore G2T gear and idler pulley 1X M5x20 bolt + nut An assortment of M3x 5/10/15/20 TBD + nuts 1X M3x40mm Small piece of PTFE tube Print Settings Printer Brand: RepRap Printer: i3 Rafts: Doesn't Matter Supports: Doesn't Matter Resolution: 0.25MM Infill: 15% Notes: I used 2 perimeters/shell with 3 bottom 4 top layers. Feel free to use more for added strength/stiffness. All parts are oriented for best results, some will require supports. Post-Printing Ensure that you have excellent layer bonding and that the rails fit nicely. There is a small built in tolerance but warping or poor overhang performance will cause the opening to be too small and inserting the rails will split the part. You may need to drill out the 3mm (3.3 design) holes and tap the 2.5s if they come out undersized.