Parametric Dowel Block drilling jig

thingiverse

Simple jig for drilling dowel rods into sheet wood. This DIY jig is functional, but caution must be taken when using it because the plastic is brittle, so it can crack if the drill bit catches the edge. This is an open-source OpenSCAD file + 2 STL files. I created the OpenSCAD file to customize the block for various settings like wood width, dowel size, depth, and block size. The OpenSCAD file is set up for an 18MM block as printed on an old printer I had. To ensure a tight fit between the cutout and drill hole, you must verify that both are snug. The drill hole should allow the drill to fit without grabbing the plastic; adding oil can help. Ideally, the drill hole should be as smooth as possible by using lower layer heights. High infill settings (at least 30%) will provide strength for the block, and three or more perimeters are recommended. If you have any questions, I'll try to answer them, but this project was created a long time ago, and only a conversation triggered its upload.