Z wobble fix for Craftbot/Plus

This is a printable replacement Z nut for Craftbots and Craftbot+, new Craftbots use anti backlash so this issue has been fixed but if you have Craftbot or Craftbot plus with bad Z wobble its likely from a loose nylon Z nut. Print this at 0.1mm layer height on a good printer like an original prusa MK2 or better. Replace the nylon Z nut to cure Z wobble, confirmed working on my CB+ with images to show results before and after. Printed in PLA.