Simple Friction Chalk Holder That Actually Works (SCAD)
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I wanted a simple, small chalk holder, but collet-style mechanisms are just unsuitable for printing in plastic unless…
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I wanted a simple, small chalk holder, but collet-style mechanisms are just unsuitable for printing in plastic unless they're comically oversized. I did try this model: https://www.thingiverse.com/make:1205539 ... but it was larger than I expected, and it didn't work due to unnecessary design flaws caused by trying to make it look cool. I ended up making some holders from scrap brass before transferring the concept to SCAD. That's what this is. If you don't have a bunch of spent 30-06 blanks, then I guess you can get by with one of these plastic things.
The concept is simple. It's just a push-through design. Use another piece of chalk to push the chalk into place or advance it. If you use enough stickout, you can advance it by just pulling on the chalk, but don't blame me if you break your chalk. It's oversimplified, but better than nothing. That sounds like the gamut of practical designs in FDM.
Contrary to #3188241, as far as I know, US chalk is not 9mm. It's 3/8". All the chalk I have is 9.45-9.56mm. That's not 9mm. I have never seen 9mm chalk, and the only references to 9mm sized chalk I can find on the web are all AI-generated click traps. I know larger sizes and tapered cast chalk exist though. These are sized to fit the chalk that I have, but you can adjust the size and the amount of preload as you see fit.
Category: Art Tools