Geoffs Nozzle Size Indicator

With several 3D printers, it's quite hard to remember nozzle sizes for each one - I've seen several on thingiverse, but I wanted one that was both easy to read and HARD to change accidentally.

I printed mine in 2 colors (layer change 22 with a 0.3mm Nozzle), although a texta Color would also do the trick. WhHen finished I ran a 3mm taper tap half way thru each hole - the indicator is a m3 screw, although pretty much any small screw should work Ok too.