3DConnection Space Mouse (Compact, Wired) stand / Wrist Riser -  This will print in under an hour, no supports needed.  

Line up the wire in the cutout, before placing the device in the stand. It fits pretty snuggly. I didn't want it jumping around. I was able to remove it by lightly prying it through the cord opening with the awl of my leatherman. I wanted the same “palm hold” from the larger model, but didn't have a need for the additional programming buttons and this works really well for me.   

I successfully printed this with the circular cutout having a .5mm smaller circumference. I increased the cutout by .5mm and extended the palm rest by about 10mm. Let me know what adjustments would make it better and I'll take a look. 

Thanks!