Improved M4 Z Couple

Now designed with more contact with the M4 rod and bolts closer in to the M4 rod.

Vitamins:

Plastic tube 8mm OD, 5mm ID, 2x 15mm lengths
8x M3x10 bolts (I only had M3x15)
8x M3 nuts
Solidly clamps M4 threaded rod to the Z motors.