Thirteen Tiling Puzzles

Each puzzle is composed of 6 different pieces, all hexominos. The pieces are to fill a square box sized to hold 6 hexominos.

Eight different hexominos are provided; a set of 6 hexominos, "set_six.stl" and a set of 2 hexomnos, "set_two.stl".

The hexominos in set_two.stl are referred in this text as X and Y and it is best if they are colored differently than the hexominos in set_six.stl which are called A, B, C, D, E, and F in the answers below.
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Puzzle 1 is composed of the hexominos in set_six.stl; they are to tile the square box,"target_6x6.stl"

Puzzles 2 through 7 are made by combining hexomines from set_six.stl and heptomino X from set_two.stl. Heptomino X is made of 6 squares joined so as to form a rectangle 6 times as long as it is wide. Substitute each of the hexominos in set_six.stl, one at a time, with heptomino X, to make 6 puzzles.

Puzzles 8 through 13 are made by combining hexomines from set_six.stl and heptomino Y from set_two.stl. Substitute each of t