Reprap Prism double Z motor mount.
thingiverse
This is an alternative method to install Z stepper motors and top rod like Prusa, but with motors on the bottom. To mount the Z motor-rod: remove supports, clean the area, drill two M4 holes through the bridge and two more of proper size; then, drill an 8mm hole for the smooth rod. Install an M3 nut and bolt on the 8mm hole. For the Z top support, drill four M4 holes of proper size and an 8mm hole for the smooth rod. Again, install an M3 nut and bolt on the 8mm hole. For couplers: drill a 5mm hole for the motor, fit an M3 nut and bolt, and press an M8 or 5/16 nut into place (a couple of drops of glue can help).
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