MendelMax Z axis mounts and clamp

We made a redesign of the Z-axis parts as we wanted to beef up the Z axis mounts. The Z motor mount was beefed up as the original was a bit thin and cracked a bit too easy. The bottom Z mount was more stable and is able to hold a 608 bearing for an 8mm drive shaft. The bottom Z mount was also moved from sitting on the table surface and M5 nut captures were added. The z clamp are also different as they are a little shorter than the standard Mendelmax Z-clamps.

All of the hardware is the same e