Six right handed and six left handed pieces are needed for this puzzle, it's not that difficult to figure out, but still an entertaining puzzle none the less. I included a 2 piece and a 4 piece design because when I tried to print more than 4 they warped too much by the time it was done printing. Either print 6 of the 2-piece stl, or 3 of the 4-piece stl, the sizes should be identical for the two stl files, so if it warps while printing 4 then try printing two at a time. Both stl files include an even number of right and left handed pieces. Enjoy the puzzle!Helpful hint for sanding off the raft: Two pieces connected directly over top of eachother makes it a nice easy rectangle to hold while sanding!