Just something, i've thrown together in TinkerCAD - not testet yet, since i'm currently collecting all the parts needed to build my own HyperCube. This mount is supposed to be used with this or similar ⌀ 36 mm motor: https://www.banggood.com/EleksMaker-555-Spindle-Motor-Replacement-Parts-for-EleksMill-CNC-Engraving-Machine-p-1200832.html

Update 201805081504: Redesigned in Solid Edge ST9; added chamfer

Update 201802181725: Found an issue with mounting holes - false measurements were taken - fixed.

Update 201802181625: Added countersunk holes for screw heads in the clamp - now you can use two M3*20 mm screws.