Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4392316.

Side exit cable strain relief for the Z axis stepper motor and spindle motor cables on a 3018 CNC Mill / Engraver, but may be useful for other projects with NEMA 17 steppers. The cable can be attached with cable ties or velcro tape.

Update: I've added a mirrored version, in case someone prefers to have the cable exit at the opposite side.