Chuck Type Burr Puzzle
This is a 24 Piece, Chuck Type, Burr Puzzle, made from 12mm Poplar plywood. The chuck type burrs have U shaped sticks of varying lengths and 1-2 locking sticks to keep the whole puzzle together. The locking pieces were made by creating a U shaped stick and then rotating it 90 degrees and removing the locking section. It's also possible to make a 6 piece burr but the larger puzzle is much more interesting to assemble, plus you can make the 6 piece with parts from the big one (svg here)