HyperCube Evo Parts for 20x20 Extrusion

Just re-designed some parts for 20x20 extrusion.

Update 01 Jun 2018
--------------------------
Added XY Idlers for 8mm Rod. (thanks to @FelipeSanchez)

Update 31 May 2018
--------------------------
STEP files added.

Update 24 Agu 2017
--------------------------
Added following files
Z_Axis_Linear_Rail_Bracket_-_Double_Z_-_Left_1.1 20x20
Z_Axis_Linear_Rail_Bracket_-_Double_Z_-_Right_1.1 20x20
Z_Axis_Linear_Rail_Bracket_-_Left_1.0 20x20
Z_Axis_Linear_Rail_Bracket_-_Right_1.0 20x2