...even though I did not modify any of the pieces...
Meaning? I'm guessing that you had 3D printed this as well? Assuming, that you also created the pieces to fit that particular configuration...
So, in a sense you bypassed that adding/cutting of the pieces so it could fit? And just made the piece as a whole instead - from the ground up?
I did not modify the parts that came with the DIY kit. They are still in the bag-o-parts on my workbench. Instead, I modeled an edge and corner in SolidWorks, and split them with a revolved surface. The parts were 3D printed, and sanded smooth. The resulting puzzle is very stable and smooth turning.
Because I was only making one, I used all 3D printed parts instead of a set of master parts. This saved me the time and material involved in making molds, but required more parts and sanding time.
I made up a couple of additional designs based on the 3x3x5 Cube...
Enjoy the pictures!
p.s. Master part sets and full puzzle sets are available. Check the Marketplace for details.