Two-way bolt and nuts
thingiverse
Two flavors of nuts that spin different ways on this bolt. Inspired by https://www.youtube.com/watch?v=cDfMI5ahbJI Work the nuts up and down the bolt for a while to grind off any uglies and make them rotate smoothly. Nuts should be able to fall+spin down the shaft when they're good. OnShape CAD source: https://cad.onshape.com/documents/e3684c2ecc42374a5d17a2f3/w/5f67bd9dff7c5a2eb3aa725a/e/d0253f9819c076044863ad6d
Download Model from thingiverse
With this file you will be able to print Two-way bolt and nuts with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Two-way bolt and nuts.