Geeetech i3 Pro B LCD holder

This is a modification of original Prusa LCD holder for Geeetech i3 Pro B (acrylic). While original Prusa has LCD mounted on front of the printer on two rods, i3 Pro B has LCD mounted on top of the printer. I moved LCD to the front as well and modified LCD holder to fit on two layers of 8mm acrylic there.

* LCD supports (A and B) has been modified to fit i3 Pro B.
* LCD cover and LCD knob is the same as original Prusa https://github.com/prusa3d/Original-Prusa-i3/tree/MK2/Printed-Parts/stl
* LCD cable holders are resized to fit threaded rod Geeetech has (mine on i3 has 9.5mm outside diameter, original Prusa use 10mm rods).

The assembly is the same as original -http://manual.prusa3d.com/Guide/6.+LCD+assembly/300

The rotary encoder and reset button on i3 are too long, it's necessary to cut reset button by about 5mm and encoder rod by about 7mm so it fits to LCD cover. Measure twice before cutting, the length might depend on which Chinese clone you have.