Spool Holder Bridge (for direct drive)

Filament Spool Holder Bridge for 3d printers which have direct drive extruder.
It can be assemble with 20x20 sigma profil.
Requirements:
Screws:
M4x15 ; 8 pieces ; (to assamble towers)
M4x30 ; 2 pieces ; (to assemble towers)
M4x35 ; 2 pieces ; (to assemble cylinder)
Nuts:
M4 ; 6 pieces
M4 (T-nut) ; 10 pieces
Washer ; M4 ; 6 pieces
Roller ; 608zz (8x22x7 mm) ; 2 pieces