This high quality 8mm Acme Anti-Backlash Nut Block is a great choice for many projects requiring lead screw linear motion.
The pitch and diameter are a perfect combination of high torque and speed. This screw fits the bill for most machine designs and will quickly become a standard on OpenBuilds.
Anti-Backlash Nut Block (STEP) v0.1
Anti-Backlash Nut Block / STP