Welcome, all RC enthusiasts!
One of the reasons the TT-01 is a great beginner chassis is the absolute lack of suspension adjustability - you can't mess up the setup this way. However, the chassis is rather nervous and tend to oversteer, especially with a truck body.
With this 3D-printable wheel hex, you can adjust the handling of the chassis.
Recommended printing settings:
The stock Tamiya wheels hexes are 6mm / 10mm wide. I personally use the 8mm option in the rear and the stock 6mm hex in the front.
If you want to play with different widths, I'm sharing the Fusion360 source file.
If you want to further modify your chassis with 3D prints, I suggest using:
Front diff locker for carpet racing: https://thingiverse.com/thing:2831297.
Rear uprights with custom angles: https://www.printables.com/model/119961
With those two simple modifications and the right tire combination, I was able to find great success.
Happy racing!
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The author remixed this model.