Violin hanger addon for cheap Amazon music stand designed using FreeCad.
https://www.amazon.ca/gp/product/B00K0PY1DM
I've included the freecad file in case you want to resize it for another stand.
Also created a bow hanger and some clips to keep my tablet from slipping off. They seem to do the trick, but there is definetly room for improvement.
The bow hanger was a little loose, but a peice of masking tape seem to get it to stay on, but you might be able to avoid this by printing it a bit smaller.
The music stand clip for the tablet needs to be printed twice, with one print being a mirror image of the first.
The author hasn't provided the model origin yet.