Dads Puzzle is a sliding block puzzle similar to the popular "Fifteen Puzzle".

Dad's Puzzle is also related to an older puzzle called Klotski. Wikipedia has a good article under the heading of "Klotski". 

The files here are designed to print using a standard Fused Filament Fabrication 3D printer and were tested on a Lulzbot Mini printer.

The size variable can be set to any value your printer can handle. The Lulzbot Mini can print the "Size 25" components and is a very comfortable size at approximately 130mm by 50mm. The "Size 15" makes a good pocket size version of the puzzle.

Helpful information:
https://en.wikipedia.org/wiki/Klotski
http://www.cs.brandeis.edu/~storer/JimPuzzles/ZPAGES/zzzDadsPuzzler.html
https://www.publicknowledge.org/files/What%27s%20the%20Deal%20with%20Copyright_%20Final%20version2.pdf

Files included:

dadspuzzle.scad - includes sections for printing the movable parts, the base and the cover.
dadspuzzle-15-base-move.stl - at this size, the Lulzbot Mini print bed can hold the base and moving parts at the same time (this file)
dadspuzzle-15-cover.stl - prints the cover by itself
dadspuzzle-25-base.stl - prints the base at a near-maximum size for the Lulzbot Mini
dadspuzzle-25-cover.stl - prints the cover for the large puzzle version.
dadspuzzle-25-move.stl - prints the movable puzzle pieces
dadspuzzle-directions.pdf - a short description and the puzzle solution intended to print back to back
dadspuzzle.zip - easy to download if you want the whole package of files

