Cube-Octahedron Dual

This 7-piece puzzle assembles into a cube-octahedron dual solid.  I borrowed the original wood version from the collection of Stan Issacs.  We do not know the original designer or maker.  Please contact me if you know who designed or made the original wood puzzle.

Modeling this puzzle was a challenge until I realized it fits into BurrTools.  The plastic version is an exact copy of the wood version, the pieces can even be mixed together.

Printing the pieces is difficult, even in one color.  Ideally, you want to print it in two contrasting colors, as shown in the photos. Three of the pieces (2, 3 and 4) are difficult to print, because in the most obvious orientation only an edge rests on the build plate.  If you print with default settings, even using supports, the piece may become detached from the build plate.

I was able to successfully print the pieces by modifying the support settings to "Type: normal (auto)", "threshold angle 45" and "On build plate only Yes". The Bambu Studio MDF file uses these settings. This generates a lot of unnecessary supports, but resulted in a piece that did not detach most of the time.  The pieces are not perfect, they tend to be deformed along the bottom edge. Please add a comment if you find a better way to print these pieces.

The tricky pieces could be made like the wood pieces: make three separate parts and glue them together. But the connection is small, they might break. You can also try printing them at a 45 degree angle but they will have floating edges. After I printed this I realized that only piece1 must be printed in two colors.  The interior parts of pieces 2, 3 and 4 aren't visible so these pieces can be printed all in one color.

Assembly is not simple, but most experienced burr solvers will have no problem with it.