Six-piece burr puzzles have been around since at least the 18th century, and they continue to be a source of fascination. The starter set includes 15 burr pieces (or 24 with an optional expansion) that can collectively make 90 different challenges. It's an essential cornerstone of any puzzle collection.
If 24 burr pieces aren't enough, the Extensible Burr Set has several options for printing larger sets - including a 125-piece "comprehensive" set - and code for generating models of any of the 837 theoretically possible pieces. With it you can print any six-piece burr! It is fully compatible with the Starter Burr Set.
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