The file 'Printed Cross Stitch Aida Cloth By Billie Ruben 3D Printer Model' is (stl) file type, size is 52.4KB.
More discussion on reddit, here:https://www.reddit.com/r/3Dprinting/comments/bbzjfd/i_3d_printed_a_crossstitch_test_piece_for_a/
And here:https://www.reddit.com/r/StardewValley/comments/bc5og7/ive_been_working_on_a_3d_printing_cross_stitch/