Lay flat on the flat side, and rotate on Z by 45 degrees so that it fits into the MK3s bed.
The author remixed this model.
The original was not high enough to handle the FormFutura Tough PLA 2.3kg plastic spool so I modified it using AI to elongate the middle part of the arms by about 3.5cms. Fits perfectly onto the frame of my MK3s as printed.