The stl model has 40x40mm but I printed it at 0,15mm layerheight and 75% scale so the result is 30x30mm (see 3mf file) which I think is a more suitable size. But you can scale it as you wish.
Also check out:
https://www.youtube.com/channel/UChKp-968z1i5PN29gbR7YfA
https://www.cgtrader.com/rorys3d
The author marked this model as their own original creation.