UPDATE:  Added two more STLs and another 3mf file for people who want to add magnets to the holder during printing.  I added two cavities each 9.8mm in diameter and 14mm tall.  The 3mf file has a “PAUSE” on layer 72 so that you can drop in any 9mm diameter magnets.  I used two 9x12mm magnets (one on each side) but you can stack six 9x2mm magnets if you want.  Whatever fits.

This gives you the ability to attach the remote to a metal surface so that it doesn't walk away.

Model built in OnShape - https://cad.onshape.com/documents/cbab827ba24cc9eed8768c5c/w/10f15ebce55945cd8772d8f1/e/cd15a2ad72f95e9546291c1f?renderMode=0&uiState=663a71be22bc1250c3f842a1

Holds the remote snuggly, but depending on your print settings, you can put a piece of tape or something inside to give a bit more thickness.

3MF file has both versions of the remote holder.  One for the newer remote with the volume buttons on the face of the remote.  The remote holder is the same size for both remotes, the newer one just allows the remote to sink deeper into the holder.

I created a lip at the top of the remote to wrap your fingers around to let your thumb do the pressing.

You can stand the remote up or lay it down.  Either way it is rock solid.