6mmm/s, a kinetic energy meter
thingiverse
A device for measuring kinetic energy in pea, foam dart, or airsoft toy ammunition is available. For ease of use, follow these steps: firstly, print all three components; secondly, construct the electronics using instructions found at [http://www.askrprojects.net/hardware/6mmms/index.html](http://www.askrprojects.net/hardware/6mmms/index.html); finally, enhance your Nerf toys and start firing away with "Feuer frei, goodbye" as a farewell salute.
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