X Belt tensioner for Malyan M150

thingiverse

I examined several solutions for Wanhao and similar i3 clones, including http://www.thingiverse.com/thing:1672640 and the remixes, but they didn't fit Malyan M150 properly as M150 comes with 3 linear bearing blocks that are distinct in size from Wanhao (and particularly different from those upgrades people put on Wanhao). Hence all the files I tried didn't really work. I attempted to edit them, but it's tedious work to edit STL, which is why people don't upload source files still puzzles me. So I reworked it from scratch, and it's similar to /thing:1672640 but fits Malyan M150 perfectly. It also works flawlessly in conjunction with http://www.thingiverse.com/thing:1906153. Note: Don't over-tighten your X belt! When you plan to change the X belt tension, do that when the X assembly is at the bottom or top of the printer, and don't tighten too much as you can easily bend the Z guide rods! Especially if you're increasing tension while the X assembly is at the middle of the Z. UPDATE: I changed the geometry and used better dimensions. The thing:1672640 I was using as a starting point assumes poorly calibrated printers so everything is "sloppy" and loose. UPDATE 201611231820: New image of v1.1 fitted, works flawlessly. UPDATE 201611250215: I added an "x-belt tensioner for M150 - linear". If you don't like the loop, you can use this one to attach your belt to the fixed side with teeth grooves like it is on the variable size. UPDATE: I forgot to write this before. When I was designing, printing, and using this piece, I wasn't aware that the Malyan M150 already has an embedded X belt tensioner in the frame, so this part is actually completely unnecessary! You can leave it as is, remove the spring thing from the belt, and use the screw on the right to tighten the belt. (If you look carefully, there's a notch on the right Z beam; drop your Z to that notch, and through that notch, you can access the screw to tighten or loosen the X belt, exactly like the tensioning system for Y.) Print Settings: Printer: Self-made Rafts: Doesn't Matter Supports: No Resolution: 0.25mm Infill: 30% Notes: There's a thin wall of 0.4mm on the object. Print using 0.4mm "line" or configure your slicer to detect thin walls. Anyhow, even if that thin wall isn't printed at all (as if you don't detect thin walls and your slicer is configured to print with larger lines than 0.4mm), it will be ignored, but the part is still 100% functional! The main tensioner block is properly rotated for printing, and the sliding block needs to be rotated 180 degrees (around X or Y) so that the screw head hole prints properly. How I Designed This: Onshape The source of the whole project is available: https://cad.onshape.com/documents/7cb155e953d26af39c1b9508/w/cac13f9b8a666666c8f0e621/e/8dbd92b8547ecb7d5ffd2531