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I reprinted many parts and remade the entire set again, this is probably my final attempt.

Each part is tested individually to ensure the track can drop naturally with gravity so they are all running smooth like butter.

I printed many extra part because with different layer height. Some part are even printed with 0.1 but sadly some are warp so I mix and match a bit at end between 0. 1 and 0.15 parts to find the right combination.

I am pretty sure they will work with rigid material but the real test is those tpu filament. I really hope the previous problems I encounter will not persist otherwise I ready to throw he white towel. I really tried. Lol