IPP Burr was my IPP exchange pUzzle this year. A standard six piece burr, with three extra pieces which must fit inside the six piece burr once solved. The inside pieces of course spell "IPP"! With a five move final solution, it's quite tricky but nonetheless approachable for the experienced solver.
Construction of this puzzle is excellent, with a nice precise fit. We used laminated sticks to make the burr pieces which was time consuming but turned out very well.
35 copies made for sale, each signed and dated. This puzzle is shipped disassembled.