this post was submitted on 27 Oct 2023
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3DPrinting

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[–] [email protected] 14 points 1 year ago (2 children)

Put a motion sensor in the pipe wired to a speaker that makes the warp noise each time it's triggered.

[–] [email protected] 9 points 1 year ago

Even simpler, an IR opto switch

[–] [email protected] 1 points 1 year ago

Pressure switch in the bottom maybe?