I was uncomfortable with the basic model. The inclination felt ok, although my wrist was suspended too far from the desktop.
so I took the model and edited it to obtain a slight leaning backwards, now my wrist lays on the desk and I feel way more comfortable

I edited the model with 20° inclination, but works like a charm (not sure about the new inclination)
also added a hole for the wireless receiver, since I use the mouse via cable and was quite afraid to lose it

the geometry has some small irregularities, but I didn't really care as long as it works on the printer (and it does on mine)