Having sat on an Ukulele, I decided the best way to avoid pesky repairwork would be to hang the instruments up where I can't crush them. This does the job.I've included two versions of the object as STL. One has a thicker base in case your ukulele head ends up needing to go through a wall if you try to mount it on the thinner one. The thin version looks better, and for my instruments at least, I think would work even if I had mounted them on a wall instead of the top of a shelf as I did.Included is also the Blender file for these, which should be better suited for editing than the STLs.
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Imported from Thingiverse: https://www.thingiverse.com/thing:8547
Original creator: rebuilder