Fifteen Tiling Puzzles - A Surfeit of Seven

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Puzzle 1 is composed of a set of seven heptominos, "set_seven.stl" and a target, "target_7x7.stl". The heptominos are all different; each is made of 7 squares joined together by their edges. The target is a square sized to hold 49 of the smaller squares that make the heptominos. A second target, "target_6x7.stl" is a rectangle sized to hold 42 of the squares that make the heptominos. Puzzles 2 through 8, seven in all, are made by discarding single heptominos, one at a time, from those in "set_seven.stl". Each of the seven sets of six heptominos tiles "target_6x7.stl". Seven more puzzles, Puzzles 9 through 15, can be made with heptominos from "set_seven.stl" and an eighth heptomino, "heptomino_X.stl". Replace each of the heptominos in "set_seven_stl" , one at a time with "heptomino_X.stl" to make seven sets of seven heptominos. Each set tiles "target_7x7.stl". The 7 heptomino puzzles are difficult, the six heptomino puzzles a bit easier. Print just "set_seven.stl" and "target_6x7.stl" to make a set of seven easier problems.