Dowel Jig
thingiverse
A dowel jig that can be used to join the end of a 2x4 or 1x4 (sorry, no metric) to an edge board. Find the center of the board you will be drilling into the end of, then line it up with the slot and drill through the guide (closest holes for 1x stock and further for 2x stock). hold the board up to the joining stock where you want it and draw a line on the edge of that, then use the jig there to drill mating holes. Designed in onshape https://cad.onshape.com/documents/7c7ef406bb481ae86ca1044b/w/1bf0e4676bf7c53bafc7aefb/e/a9a5cad0fefb4b92a981c124 I made it so that the dowels would be distributed on the end of a 1x4 or 2x4. Print with infill of 15% should be plenty, but add perimeters so the drill guide holes have extra strength.
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