Inspired by a recent trip to Rome, this device came in handy many a time near a crystal-blue Italian stream. To assemble, you'll need:
1x AAA battery
2x contacts of the 9.5mmx9mm spring plate variety
1x Push Button Switch of the 12x8mm DC30V 1.5A Small ON-OFF 2-pin variety
1x Motor with vibration weight attached (15mmx12mmx10mm; total length 23.6mm)
Here're some Amazon links to the motor: https://a.co/d/9gCJUez and https://a.co/d/aNOH6sO
Solder the bits together with wire and assemble.
The cap is added for convenient transport without risking the button being activated in your bag (just use masking tape to attach it to the end)
Happy Valentines Day!
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... include a note to the effect of "Hi Julius3E8, thanks for the [insert name of thing]... my life has improved five-fold on account of it and please accept this paltry amount in gratitude".
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Also, feel free to peruse my other submissions which are almost as varied as they are many:
https://www.printables.com/social/320993-julius3e8/models
http://www.thingiverse.com/Julius3E8/designs
Enjoy!
The author marked this model as their own original creation.