It's a basic router jig built to be clamped to the corner of material used to route out a 100mm pocket for recessed parts or to hide joints.
Router Jig Dimensions: 146mm x 148mm x 80mm
Pocket Hole Dimensions: 100mm x 100mm x 33mm
PETG (advised), 4+ wall count perimeter for strength.
No supports, 0.3mm layer height (or whatever)
The author marked this model as their own original creation.