Finally my P-touch series Brother Label Maker has a wall-mount holster. Specifically, this was designed to accommodate the P-Touch 2030 and it fits very nicely. I opted to make it print in to parts that are then joined by two M3 bolts.
I designed it in two parts for printability, as I didn't want a to have to print any supports. Each side can be printed laying out the outside edge, then they'll print well, without supports. Lining up the holes can be a little hit & miss, depending on your printer. I ultimately opted to just drill through one of my screw holes to make it fit better, but a high quality print shouldn't need this and I've printed a few of these and only needed to drill through once.