I don't have M3 Heated inserts so I modified the holes to be threaded M3 holes. Can secure the KUSBA in with M3x4 screws such as https://www.amazon.ca/gp/product/B0B3J35JSS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1.
The original model is for the Ender S1 but this worked on my Ender 3 V3 SE.
Extruder Mount:
Bed Mount:
Printed it at 0.12mm Layer Height to ensure internal threads are good.
The author remixed this model.
Changed holes to 2mm with threading for a M3x4 screw.