Rigidbot heated bed energy chain mount brackets

This is a mod for adding a 10x20mm energy chain for your Rigidbot heated bed cable.

You need to drill 2x M4 threaded holes to the frame pipes and 3x M4 threaded holes to the heated bed base plate. Or equivalent inch threaded holes (the mounting holes in the brackets are 4.5mm). The cable needs to be extended by around 15-20cm. 5x M4 10mm long screws are needed for mounting.

Some other notes:
- Energy chain (inner) bending radius about 17mm.
- Make sure chassis end mount bracket is right