Just thought I'd share:

Parts are printed, but are rotating on pressed in plain bearings.

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That is pretty cool! How do you handle the shut off on reverse rotation?

Do I understand correctly...a roller contact not a sliding wiper?

Genius. No friction or parts that wear out.

Love it when members continue to ONE UP the factory part and make it simple

The roller contact is Mill-Max 0945-0-15-20-09-14-11-0.

Like OEM, the primary means of preventing reverse rotation contact is gravity and inertia.

Between the 2 arms are magnets placed same polarity facing each other. This provides opposing force for roller contact and are offset to prevent any contact during reverse rotation.

I wish I could publish some fancy calculation to determine the optimum magnet offset, but it was trial and error until I could get something that worked reliably. Not to hard with inexpensive rapid prototyping of a home 3D printer.

I'm testing this on a '73 TB, so it's also nice to have the built-in backup return spring in the TPS.

Very cool.