Personally, I don't think this is a great idea, but a friend asked me to print him off a guitar holder he could attach to the top of his amp to rest his guitar against during gigs. All the models i was seeing were for clamping to the edge of a table so i came up with this design to go over top of the amp. It has pads of a softer, flexible material to grip the amp and hopefully not slip. Made from PETG and TPU. Of course, i had to integrate a glow in the dark skull into the clamp nut and line the yoke with felt to not damage finishes.