Cool design, but not great in practice...

You should be able to get replacements sent if you contact customer support and send the pics.

They are a very tight fit for sure and in a stiff kind of plastic, I was afraid I would snap something trying to put them together. I wasnt as unfortunate as you though jocke, mine didnt break.

The range rules also fits together very snug, whenever im to pull a piece off I feel like something is gonna break.

It would have been awesome if they were a recess and socket so we could magnetise them

Yeah they are a hard fit

Surprisingly enough, trying to ease them together seemed to cause issues. I had much better luck placing it flat on the table and hitting it with my palm squarely with some force.

They are a pain to be sure.

Hopefully I can get some replacements. Would have been better to recieve them assembeld.

Yeah I was trying to put mine together and started seeing the plastic turn white where you could see it's being stressed. Luckily I managed to get them built without breaking anything.

Same happened to mine, not a clean break though so will glue it in place.

They seemed to fit better when pressed together while at 90 degrees as shown in the book.