I was looking trough the museum for shape mods to do to my old megaminx and i found the half minx, which is just 3 sides of a megaminx. I was inspired by that to make one like it out of my own megaminx but i wanted to use more than just 3 sides. I took out one side and core arm and sanded down that side more, then I glued a piece of plastic to the open space and I have this

What kind of megaminx did you use?

I think it was a QJ