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https://3dprintingzoom.com/product/cctree-versatile-couplings-5mm-to-8mm-nema-17-shaft-coupler-forcreality-cr-10-cr-10s-s4-s5-makerbot-reprap-prusa-i3-3d-printer-or-cnc-machine-pack-of-5pcs/
CCTREE Versatile Couplings 5mm to 8mm NEMA 17 Shaft Coupler forCreality CR-10 CR-10S S4 S5 Makerbot RepRap Prusa i3 3D Printer or CNC Machine (Pack of 5pcs)