Solid sample burr puzzles

Cutler has shown in his article "The Six-Piece Burr" that there are a total of 314 solutions to solid six piece burrs if only notchable pieces are used. One of them is particularly well known and has been often used to produce commercial six-piece burrs. Stewart Coffin has described two of the 314 puzzles as the most interesting (#305) and the most difficult (#306) ones in his book "The Puzzling World of Polyhedral Dissections".

Burr		Description
	The well known one Level 1	There are two solutions, one being the mirror image of the other.
	Burr #305 Level 1
	Burr #306 Level 1	Note that only the third piece is different from burr #305.