I designed this for space reasons, as my rack in its current position would not allow for a headphone holder to stick out the sides where my previous design was sitting.

It will only work if the devices mounted to the rack are not inset in the rack itself because the headphone holder sticks out a bit on the sides (see photo) and is not according to 19" specs. But then again, if inset, the holder wouldn't work very well. At least (in contrast to an earlier design) this completely adheres to the height limit of 1HU at 43mm and thus should fit between things in most scenarios.

I also suspect it works best on a light blind plate like in my example (see photo) so that the screws don't need to be super tight (and destroy the holder in the process - So better not try this with a JV-880 or a DAT deck :)

It prints fine on one side, sorry for not exporting it in that way.

You can find the original design here:

https://cad.onshape.com/documents/3a4a1a098304aec644caf982/w/06f3fb7a23d14d0ccdd930e2/e/3b49491fd5b047231e806e80?renderMode=0&uiState=69b970d1a3a8a26465bad39b