Custom Blocks: Press Fit Parts

When I was a child, I really wanted to play with LEGO. However, I could not get LEGO.
I still don't have LEGO, but I still would like to have it and play it.

Therefore, at this time, I'm going to create custom blocks to making shapes.

As the strategy to making press-fit blocks, I changed only the size of the holes.

I made a slider to change the tolerances of the holes.

I printed four variations of the tolerances in holes (1, 2, 3, 4 mm)

In the first design, I found the following things.

1. The bottom hole disappears. Thus it needs to change the design of the top connect parts shape and bottom hole.
2. The tolerances should be under 1mm

I designed the 2nd design. I printed 5 variations of the tolerances in holes (0.95, 0.9, 0.8, 0.7 mm)

From actual printed parts, I found the tolerances of the hole should be 0.7mm

And top sides connecting parts should be the wrong equation.

Therefore I fixed the program and printed it out with the tolerances of 0.7mm.

I printed two of them first. Then I confirmed it is press-fitting blocks.

Using these blocks, I can make various shapes.

I use one of the designs as a cat lock of the cabinet door under the sink.