This enclosure is optimized for a 0.6mm nozzle. The two pieces snap together. There are holes in the top piece for heated M3 threaded inserts that are roughly 4.6mm x 5.7mm in size. 6mm M3 socket head cap screws can be placed through the holes in the bottom piece and then fastened into the inserts to secure both parts together.
The PCB from the WeMOS PCB inserts into the grooves at the front of the box and a 40mm Noctua fan (or similar) can be placed in the compartment at the back for ventilation.
The author hasn't provided the model origin yet.