This is a T-Nut for the Anycubic Kossel Linear Plus. Anycubic delivers their printer with 18 T-Nuts for the linear rails which have 57 holes. My rails were not tight enough, so I decided to add some nuts.
Since I didn't want to order them (waiting for a package) and my local store haven't got some, I designed them.
In the hope that someone will find this useful I upload the file here.
Designed in SIEMENS NX 10.0.
If you want to modify the T-Nut, the file is attached.