Thanks almaro for publishing Sketchup files!
This version i modified for my Graber i3 bowden printer.
I reduce the angle for 5º because i got worried about the forces in the top frame, since the filament is 1kg, and also the height to fit with the 6mm MDF graber i3 structure.
I place my extruder on the right top too using the same screws from the structure on a minimalistic way, so in the bottom i place a path holder to guide the filament throught an PTFE tube to the extruder (ill take a photo soon).
Top oppened for more easily removing optional (i prefer it).
You will need 22mm rollers, threaded rod, 8mm screws and washers.