Calibrate your printer x,y,z and e quickly and easily.

UPDATED V3 added - same as V2 except I have included a pair of towers and a bridge, this should test retraction settings as strings will form between the towers if your retraction is insufficient, bridge is a test of part cooling fan's ability to cool the filament enough to keep it horizontal.

UPDATED V2 added. So a few tweaks, I've made the 50mm x50mm part a little taller as use of brims, and the spread of filament on the first layer make measuring without a little extra height more difficul