Thumper - Harmonica Clip - Quick Release

Allows quicker movement of the cam arm
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updated September 14, 2025

Description

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Quite like the Thumper indexing mechanism, except when I'm trying to reset it back to the start. Didn't like having the clip drop away either, so I split the cam arm into two pieces and added dovetail joints to them. 

It flexes using a bit of slingshot elastic or bungee cord (tied really really tight) and has a lever so you can easily activate it.

With this remix you can disengage the cam arm from the harmonica clips, allowing it to freely move (back to the start location) without having to move along the index grooves.

Print with at least 5 walls, 25% infill

Check out my other parts for the Thumper - https://www.printables.com/@JoonChor/collections/2652758

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Model origin

The author remixed this model.

Differences of the remix compared to the original

Splits cam arm into two parts, so that it can swing slightly open

License