FT5 X-Stepper support (FT8 & FT9)

On demand : The parts supporting the X-stepper and the cablechain.
Not tested yet. I didn't have the time to do that yet.
I recommend to print them in ABS as the stepper can become warm or even hot.

I made 2 new versions of the FT8 and FT9:
FT8-V2.STL : has now a cavity for the heads of the bolts holding the endstop
FT9.STL : cut out some plastic (insulation!) on top of the stepper to improve cooling a bit.

So printed and tested it. As a result I made a FT9V2.STL with a cavity for the