FFXIV Machinist Stone
thingiverse
As Titor hasn't acquired an MCH Stone for his impressive collection yet, I had to create one myself ^^. It's actually quite basic and simple, but the second model is a larger version with a hole underneath that allows you to add a small electronic component: a CR232 battery holder, a mini LED, a resistor & a hall effect sensor. This setup will get it to light up when you hold it in your hand (with a magnet on a band around your hand !). It may require some effort to fit everything inside, but it worked for me.
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