I This is for the following product
https://www.aliexpress.com/item/1005004407649001.html?spm=a2g0o.order_list.0.0.8ec01802ioh7Xm
Mounts to any 20x20 extrusion via the modular case parts.
The case is held together via 4 M2 self tapping screws, the case is then bolted to the articulating arm using 2 M2x8 self tapping screws. Ensure you fasten the two internal screws first, there is two rows so you can raise the case a little higher or lower beyond the mount range.
You will need to use a 5mm heat insert into the articulating arm so that it can be clamped against the mount using the 30mm x 3mm bolt.
I would suggest this is printed at 0.1mm layer height and 20% infil for that fine finish and tolerance for the bolts/screws along with the board fitment.

The author hasn't provided the model origin yet.