Cutting Compass for Drill Press/Hand Drill

thingiverse

In the need of cutting a round hole (really round!) into a piece of polystyrene foam (in europe we call it styropor), this tool was designed. Whit it, it is possible to cut a round hole (guided by the 4mm drill) into any foam-like (or other soft...) material. It was designed for minimal material use and printing time (made mine on a prusa with a 0.35mm nozzle within less than 15mins. Instructions CAUTION! This can be an extremely dangerous tool if you don't handle it with care. Please make sure you only hit the button of your drill if your fingers are in a safe distance from the blade! All you need except the printed parts is a 4mm drill bit, a piece of M4 threaded rod or a long M4 screw and some M4 nuts. I took the stuff I had lying around in my toolshop... Assemble as on sketch... You can change the diameter of the hole easily by unscrewing the blade or the drill. If you are going to use it with soft materials, you might want to print a centering disk too. Glue it onto your workpiece (hotglue is fine, double sided tape will do the job too...) to prevent the drill bit from breaking out too much. Hint: I used a wing nut on the drill bit side to be able to change the cutting diameter by hand.