dual e3d support

I designed this support with huge amount of adjustment and few complex pieces.
You will need 3X SCS8UU (LM8UU+aluminium bearing block),ordinary in prusa clone kits and 4X M3x25 bolts
there is no belt tensioner,i suggest this https://www.thingiverse.com/thing:1683070 from freemark.

installation advice:
1:lower the z carriage as much as possible.
2:screw the chassis and belt fixation.
3:install the two extruder but do not tighten the screws.
4:lower the two hotend in the contact of the be