This is a smaller version: 10 x 5 x 15 cm.

When I printed it with 0.3mm layer height (default perimeters settings and 0.4mm nozzle) I would say I'm not happy with it being too fragily. The walls are too thin. So I'd recommend making them thicker.

Supports were generated in Meshmixer (following brilliant Prusa's guide on youtube). If you want to use them they have to be imported as "a part" to the already opened STL.

Watch Prusa's guide if you don't know how to do that. https://www.youtube.com/watch?v=OXFKVmMwXCQ