Top Tensioner slider for Anycubic Kossel Linear Plus belts (in OpenSCAD)

prusaprinters

BackgroundThe Top Belt Tensioner designed by Atziano (see "Remixed from" link) is really effective and does the job nicely - but I had real trouble getting the captive nuts to fit properly. This is probably due to my printing technique!So I redesigned the slider in OpenSCAD to use M3 threaded inserts that I bought from eBay. If you can't get exactly the same inserts you can modify the recesses to fit whatever you can get.I used M3 nuts drilled out to 3mm as spacers on each side of the belt pulley.UPDATE: I found that the bearings were noisy in my original design - they rattled around on the M3 screw as they weren't securely fixed. Version 2.1 has a built-in spacer, and uses a M3 nyloc nut to fix the bearing in place. The threaded insert has been removed from the bearing support screw.HardwareM3 threaded inserts: these were made and supplied by a UK eBay trader - your mileage may vary.The screws through the slider that support the pulley are M3 x 20mm (I re-used the ones that came from the printer).The adjustment screws are M3 x 35mm.UpdateI have added the insert test OpenSCAD file - this is a small piece for testing the fit of the M3 threaded insert.Print SettingsPrinter:Prusa i3 clone (much modified)Rafts: NoSupports:Doesn't MatterResolution: 0.2Infill:25% to 30%Filament:HobbyKing PLA Yellow Notes: Use whatever materials and settings suit your requirements and experience.  Category: 3D Printer Parts