Camper fridge ventilator holder

Because of temperature problems I needed a ventilator for the fridge at my campervan. It should blow in a 45° angle.
This part needs no screws to fix it and I can move it to the right position without tools.

My printer is quite small so I can't print it in one piece. I need to combine the parts with a screw (M4). The threads are cut after printing. I added a file in one piece but couldn't test it.