The STLs and Gcode is built for 10mm x 1.5mm cylindrical magnet with holes for M2.5 wood screws (I mount it under my desk). You can change these parameters in Fusion 360 model.
I've printed this in PET in 0.15mm resolution with 0.05mm tolerance of the magnet socket and it's a tight press fit, so no glue needed. The thickness of the hook should also work for PLA (for standard 3.5mm cable).
The author hasn't provided the model origin yet.