This is a low profile case for the Logitech pebble mouse. It uses 8x 5x3mm magnets to hold it together.
Suggest printing the first layer concentric and then 2 layes zigzag.
Works with TPU or PLA
I used the pebble mouse model from here to carve out the cavity in the middle.
https://www.thingiverse.com/thing:5701394
The author remixed this model.