Below is the first revision:
(REV 1 of the Frame)
The Z axis moves on two smooth rods (5/16" or 9mm if I'm lucky) and uses a 5/16 threaded rod. This setup is the same as what is used on my RepRap, and is quite reliable and can provide very small layer heights. If I want to improve my layer resolution, I can always upgrade later to ACME rod, which is designed for high precision linear motion.
(Close up of the Z axis, coupler not included yet)
Two components have been designed to be 3D printed for the frame. The first is a holder for the NEMA 17 stepper motor and smooth rods. It will be mounted on the top of the frame.
(NEMA 17 Holder)
The second component is a bearing holder for the bottom of the smooth rod. It will help to constrain the rod and allow it to still rotate. This is based on a Z stabilizer part found on Thingiverse, and should help increase part accuracy. I will use a helicoil shaft coupler to attach the stepper motor to the threaded rod, to reduce the chance of binding.
(608zz Bearing mount with integrated smooth rod holders)
All parts will be available on Thingiverse as soon as I can convert them to STLs.
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