The retainerclip of my Multistar Elite 2306-2150kv was rubbing around the centerholes of the motormounts of the HK Color 250, so these thick spacers were left by me with a 10mm centerhole and only the 19mm spaced holes since the motors came with only 2 screws each.
Designed and exported to . stl in OnShape
Printer: Rostock Delta
Rafts: Doesn't Matter