Missing Jigsaw Puzzle Pieces

My wife's family has been into jigsaw puzzles for quite some time. So we not only have puzzles from my wife's childhood, but we also have vintage wooden puzzles that belonged to her grandmother and even another family before that. As you might expect, several are missing pieces. "Finishing" a puzzle with missing pieces just isn't as satisfying.

Some people glue together pieces of cardboard, trace out the missing piece on paper, and then cut, test, adjust, shave, test, adjust until it fits. If you have enough skill, you can do this without much patience. Without sufficient skill, a lot of patience is required. In our house, the needed combination of skill and/or patience does not exist.

 So, we turned to modern technology.  The Instructable features the Prusa Mini+ along with Procreate on an iPad.