XY Gantry spacers for my
xBot 3D Printer
Because the 20-GT2 pulleys have different dimensions (some are longer than others) you might easily find you need to print some different sized pulleys to make sure the belts are centered over the matching rods.
More information:
You can read more about the xBot 3D Printer on
my blog BeTrue3D.dk (opens my blog in new window)