I started with Marchant Dice screws then gave them away when I switched to Gary's screws. Then I had to modify Gary's screws with springs before I finally got zero backlash which I find very reassuring

Unfortunately, to make a pretty cnc you need cnc, my first attempt was a bit of a bodge. Consider starting with a fudge to get you going and then pretty it up. Getting the screw ends machined to your design is money well spent.

I like NEMA 34 motors and big volts, I get more leverage on the rotor for microstepping. I connected motors to screws with belts.That way I kept the handles, set the X motor low so it didn't overhang the top of the bed and the belt insulates the ballscrew from the heat.

If it helps, I have the AutoCAD R14 file I designed it on, random jottings, various revisions all jumbled together, different Z axis, not pretty but complete :naughty:

Robin