At this point, I discovered an error in machining, and realized that each triangle part was 0.13 mm too thin. The difference is very small, but the error stacks up.

Luckily, nylon washers were available at this thickness, so I used one between each triangle part.

Here you can see the spacing washers. If this had not worked, I would have had to start over.

Most of the parts slide onto the screw freely. Only the last 4 actually thread.

With the spacers, the triangles and pentagons line up as they should. What a relief!

Here, the first few triangle shards have been completed.

A week later, more were finished.

The pentagon stacks were assembled in the same way.

Pentultimate pieces can also be used to play Towers of Hanoi. Two puzzles in one.

Only one more pentagon to go!

Each pentagon gets male tabs inserted at one level.

They all must slide in at the same time as shown in this picture.

This pentagon is #2, with tabs at the second level.