Motor spin indicator for the Filastruder

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This little indicator attaches to the end of the motor shaft on the Filastruder, allowing you to see how fast the shaft is spinning at any given time. It's especially helpful when the shaft starts to slow down and you're working in a noisy environment. To attach it, start by fitting the tachometer onto the motor shaft. The hole for the shaft is actually slightly larger than the motor shaft itself on the Filastruder, but when printed, it tends to be too small. In my experience, I had to drill out the hole so that it would fit securely on the shaft.