Geometry:
Tricopter 9SD is similar to my Tricopter 9SS puzzle, but in this case the non-jumbling cuts have become deep cuts, passing through the origin. The puzzle has a total of nine axes, one at every edge. Moves on these axes can be combined in any order. This makes the puzzle extremely complex as it jumbles and shape shifts constantly. If you're interested in seeing how the puzzle is built, I made a video of the assembly.
Other Items Needed:
Dye: If you want the puzzle to be black, you can save money by dyeing the pieces yourself with a nylon dye such as RIT or Dylon. Or Shapeways can dye the parts for you at an additional cost.
Stickers: Template available in the instructions forum. If you want professionally cut stickers, I recommend Oliver’s Stickers. Use a heat gun or other heat source to get the curved stickers to conform to the spherical surfaces.
Screws: Nine 12mm M3 pan head screws required, available in hardware stores or on the web.
Springs: Nine springs needed, available in web puzzle shops. I get mine from HK Now Store.
Degree of Difficulty:
Assembly: Inside-out core requires moderate dexterity to assemble.
Solving: Extremely difficult to solve.
Playability:
Tricopter 9SD turns easily once broken in, and the mechanism is relatively stable.
Have fun!