I should probably add that this is an unresponsive design, since I normally don’t do those so I figured I should give people a heads up.
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Printed some TPU rimmed responsive throws this weekend. Very surprised at the variability in stiffness between different colors of the same brand TPU. The white is actually GITD (from CCTREE), and is very stiff, which I think is to be expected for a filled filament. The brown is Hatchbox, advertised as 95A. The rest are all Overture standard TPU, also advertised as 95A. Same design and same print settings on all of these, with the outermost ~6mm having two walls and 12% gyroid infill. The red, purple, and brown all have enough flex that I can indent the outer rims pretty easily with a single thumb. The others I couldn’t indent even using both thumbs and pressing as hard as I can. There’s also variability between the flexible ones, with the red being the least stiff. I’ve always known that the dyes/pigments influence the material properties to some extent, but I did not expect the differences to be this significant. Just thought I’d throw this out here, especially for others playing with TPU.
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Spaceballs the Yo-Yo printed!
Build notes: The threads were not very easy to get to work - had to sand things down a bit, taking far longer than I thought it would. Maybe there was some arcane step with an industrial sized hair dryer I missed. Also, the MegaMaid Schwartz rings didn’t translate to Bambu Studio, so I had to add my own modifier to set the material type for the SS infused filament. I used 85% gyroid infill to give it some weight. It’s not what I’d call stable or long spinning,but it works!
God willing there will be a second one - Spaceballs the Yo-Yo: The Search for More Filament.
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With Yogurt! 
Good to know about the issues with the threads. On my prints they came together pretty easily with no resistance, but I might be able to make a looser tolerance version with more accommodating threads.
You might also try lowering your print temp by ~10 degrees and find the threads work better as well, but that’s only assuming the issue is a little over extrusion preventing easy threading.
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The kids love this one 