Space out the Y-axes during montage
When you build the Prusa I3 3D printer, you have to space the Y-axes exacly 16cm apart and parrallel.
During assembly this tool helps you space-out the correct distance for the Y-axes threaded rods.
Align the Y-axes belt
It also helps to align the Y-axes motor and idler because there is a center mark on this spacer tool.
Only short usefullness
This makes the assembly a bit easier, however you will need it only for a couple of minutes during assembly.
The design is very simplistic, I have saved some fillament by placing some extra holes.
No special slicing tips or settings required.