This has been in work for few weeks, I designed it in Fusion 360 and tested with DasFilament refills.
This was designed in Fusion 360, I went through many different locking mechanisms and then came out with this one. It is fast and easy to print, also it is light wight. With about 70g and just over 3 hours of print time it is by far one of the easiest PrusaMasterspool conversions.
Print instructions:
I suggest you print the center piece with 5% Gyroid infill and 0.3mm layer height, after that you have to print the lock and 2x pin together, print with 0.15mm layerheight and 100% infill.
Here is a video how to assemble your new PrusaMasterspool
The author hasn't provided the model origin yet.