Round Stock Measuring Tool

This is an extensible round stock measuring tool. Each segment is 150mm long. You can print additional segments and connect them with printed pins and an M5 bolt. There are 5mm holes in the plate for mounting to a bench. You can place the tabs into the slots get different measurements. There is pretty good repeatability in my tests. The tabs subtract 5mm to 14mm from the slot they are placed in. For example, if you place the -9mm tab at 130mm, the usable channel is 130-9=121mm. The pen a