This puzzle is a regular six-piece burr completly enclosed into a cube. The design is not yet finished, as I am still calculating through all possibilites using notched pieces to come up with a good high level burr to insert.
PDF file with solution:
The following pictures show a version with a larger bevel on
the cage as well as the pices.
Here you can see Karin and Jürg at IPP20 in Los Angeles, with their Burr in a Cube #1
puzzle on the table.