Counterweight with an M10 nut and a solid face for STYR-01 robot

An updated counterweight model with an M10 nut pocket to add more weight and to improve stability. It works even with default 15% infill (use more for better stability) and allows to attach a heavier head. The pocket and the cap are VERY tight, some force should be applied to close the cap. But it holds in place without any glue. The M10 nut I've used was 16.8mm width and 7.8 mm height, 19.4mm diagonal. Also I've decreased the square hole size in the counterweight a bit for tighter fit. Now it is 5.1 mm. An updated solid face model (without thin walls) can be easily printed using 0.4mm line width, 0.2mm layer height and 15% infill (or less), like most other parts. Try it, if you have issues with printing the original one. It is about 1 gram heavier, than the original. The counterweight and the face are mostly compatible with the original STYR-01 V4 parts: https://www.printables.com/model/1194641-styr-01-the-self-stabilizing-rolling-robot However, you may get a “one piece at a time” robot, if some models are updated =)