support bed cr10 310x310 for hypercube

support hotbed cr10 for hypercube

1 axis axis Z , the cale is optionnal if you added 4.4cm on the aluminium tube on the middle.

need :
- 4 x M5 x 50 (for cale)
- 4 x M4 x 40 (bed)
- 4 x nut M4