This case is designed to fit the Proxmark3 Easy (from Aliexpress or dangerousthings) like a glove. As such it has pretty tight tolerances.
Print it standing on the “nose” with a 0.4mm nozzle.
Walls are 0.8mm so it basically only consists of parameters.
To fix the lid you will need M3x8 (or shorter) screws.
The author hasn't provided the model origin yet.