I made this one the fall of 2018 for my granddaughter the same time I was working on the Lobster Push Toy. This was based on a version we saw in a toy store. I added one more shape (I’m not sure which but I think it’s the triangle).
The wood is cherry harvested from a local forest and a 1/8” plywood door. One trick was getting the shape and the opening sizes such that each piece would only fit in the correct hole. Once the holes were made a bit oversized there wasn’t a lot of room for error. The square and the circle were the trickiest if I recall correctly.
The shapes were cut on the table saw – except for the dowel which was a bit of lathe work. The “X” shape wasn’t that hard once I figured out the cut sequence. The triangle took a bit of thinking as well.
Openings were cut into the holding tray with a scroll saw and then a floor was glued on.
It was a fun toy to design and make. It turned out to be a bit of challenge to keep finding all the pieces though.
Update: I put together a plan view of the holder. The dimensions are for the openings. I put a small chamfer on the openings which creates the double lines. The blocks are 1/32" smaller per side or 1/16" smaller overall. Here are the dimensions of them: