1/4" Security Knob

prusaprinters

<p>This is a replacement for e.g. the clamping screw knob of a RAM mount on motorcycles to hinder theft:<br/> When trying to turn, the outer cylinder rotates freely. You need a key-knob to (un)screw it.<br/> It is surely still be possible with a gripper, but not easily by hand while walking along.<br/> I have seen similar commercially available solutions, but wanted to make my own.</p> <p>In Addition to the printed parts, you also need:<br/> • a bit of glue<br/> • one 1/4-20 hex-nut (height: 7/32" (5,556 mm) / wrench size: 7/16" (11,11 mm))<br/> • a matching washer to protect the plastic</p> <p>All parts are printable without support.<br/> I have used PETG, seems to hold well for 2 years now.</p> <p>To assemble:<br/> • a bit of sanding may help to reduce friction later<br/> • take the lower part (with the nut pocket) and insert the nut<br/> • put a bit of glue in the pockets around the nut<br/> • place the outer cylinder over it (flat edge on the inside pointing to the nut)<br/> • put the other inner part (with the "crown") in from above and press the inner parts together</p> Category: Automotive