This 3/8"-10TPI ACME nut prints in two sections which screw together.

The top section is a micrometer screw, moving (1/11)-(1/10) of an inch relative to the leadscrew per turn. This lets you adjust the fit from 'good' to 'perfect'.

As usual, all files on my site too. http://burningsmell.org/3d/junk/3-8-10-adj/

.scad file requires tsmthread4.scad, found http://burningsmell.org/3d/lib/tsmthread/tsmthread4.scad or https://www.thingiverse.com/thing:3391213

Lulzbot

Mini 2

Doesn't Matter

Doesn't Matter

Printed with Cura on medium setting.