Jig for Igubal KBRM03 3mm rod ends. I made this to bolt onto 20x60 Linear Rail.
Link to purchase rod ends:
https://simplybearings.co.uk/shop/p600001/igubal-KBRM03-Right-Hand-Thread-Rod-Ends-3mm-Bore-M3-Thread/product_info.html
The author marked this model as their own original creation.