The stand is divided into 3 parts, with the "S" shaped part being the component which will hold everything together. The "C" shaped clamp goes into the rectangular slot on the stand as shown in 2nd Image, and depending on your printer's tolerances GLUE Might BE REQUIRED.

Slice and print the ModelLayout File for the controller stand. The Optional Headset rest is included in a separate file.

The optional Headset rest has a completely flat part, on the side of the tail, and if your printer is good enough, you'll need no supports to print this part.

The model is made in OnShape, hosted at "https://cad.onshape.com/documents/f2dcb4c9ec14406658633678/w/27da633af2bbc4584612b07b/e/53c70077460bd6e50748ecab?renderMode=0&leftPanel=false&uiState=698190687017f869f03fc23f" and is public/free to copy for anyone with an OnShape Account, and I've included STEP files in here too.

The model is as parametric as possible (I could make), and I've described the parameters, so feel free to change the parameters and print it. Thanks