Heatbed protection cap / Bed leveling spring cap
thingiverse
These springs from [Aliexpress](http://s.click.aliexpress.com/e/bAubiA2) fit perfectly for adjusting bed leveling screws. But watch out, some of them have sharp edges that could easily damage the sensitive electronics on your PCB or heated bed. Metal is a great conductor, so if these sharp edges come into contact with any circuitry, it can cause a short circuit and wreak havoc on your 3D printer.
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