Center Finder + Edge Marker

thingiverse

This is a versatile tool and edge marker that most standard pencils should fit into. To secure the pencil, simply squeeze the sides of the center finder in place while marking the center line. Flip the tool over and use its markings to measure and mark 1/2, 3/8, 1/4, 1/8, 7/16, 5/16, 3/16, and 1/16. I can confidently say that these measurements are quite accurate, as I double-checked each length after my first print. The tool prints in three separate pieces, so you won't need any supports (just print the peg twice). The pieces fit together snugly, but you should still be able to assemble them without breaking anything. I first saw a similar tool on an Instagram ad and later discovered that Rockler sells it too - https://www.rockler.com/rockler-center-offset-marking-tool. UPDATE 5/2/19 A friend challenged me to add a version with 608 bearings instead of the plastic pegs, which I happily accepted. While I believe it would take hundreds of passes on rough cut lumber before you'd notice any significant wear on an ABS or PETG part, I went ahead and made the change. The new pegs use two standard 608 bearings to roll across the stock as opposed to sliding like in the original model. To assemble this version, you'll need the following: Two - M5x40 hex (or 35, which is what I used) Two - M5 washers Two - M5 nuts or nyloc nuts It may take some effort to get the hex screws in place. I had to thread them multiple times until I could push the screw through for the hex head to seat properly in the peg base. Use the pictures as a reference for assembly.