it's pretty good, I would recommend making the rest wider a little bit and slightly rounded off at the edge.
I printed this with PETG, then I used a length of double-sided sticky tape to attach it to the mouse. I also use the same tape skimping for expensive mouse skates. (edited)



Printed Several of these around for around the house. I ended up gluing one of them together.
i printed the bottom half from Prusament PETG and the top part from Das Filament TPU. (edited)