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

thingiverse

<h2>Background</h2> The Top Belt Tensioner, designed by Atziano (see "Remixed from" link on the left), performs exceptionally well and gets the job done efficiently - but I had significant trouble getting the captive nuts to fit properly. This is likely due to my printing technique! So, I redesigned the slider in OpenSCAD to use M3 threaded inserts that I purchased from eBay. If you're unable to obtain exactly the same inserts, modify the recesses to accommodate whatever you can get. I used M3 nuts drilled out to 3mm as spacers on each side of the belt pulley. <b>UPDATE:</b> I discovered that the bearings were noisy in my original design - they rattled around on the M3 screw because they weren't securely fixed. Version 2.1 features a built-in spacer, and employs a M3 nyloc nut to firmly fix the bearing in place. The threaded insert has been removed from the bearing support screw. <h2>Hardware</h2> <ul> <li><a href="https://www.ebay.co.uk/itm/M3-M4-M5-M6-Threaded-Solid-Brass-Press-in-Barbed-Inserts-for-plastic-press-fit/262993790868?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D9365c4dc5b9540f69bd3828d414a3217%26pid%3D100675%26rk%3D3%26rkt%3D15%26mehot%3Dpp%26sd%3D361582679814%26itm%3D262993790868%26pmt%3D0%26noa%3D1%26pg%3D2380057&_trksid=p2380057.c100675.m4236&_trkparms=pageci%3Adc53a1e6-120b-11ea-b624-74dbd180d82d%7Cparentrq%3Ab33ee4d016e0a9e42a492213ffdda216%7Ciid%3A1">M3 threaded inserts</a>: I sourced these from a UK eBay trader - your results may vary.</li> <li>The screws through the slider that support the pulley are M3 x 20mm (I reused the ones that came with the printer).</li> <li>The adjustment screws are M3 x 35mm.</li> </ul> <h2>Update</h2> I have added the insert test OpenSCAD file - this is a small piece for testing the fit of the M3 threaded insert.