3 mm Spanner for Bed Levelling Screws

thingiverse

For bed levelling on my Prusa Mendel, I designed a spanner with an open end at one end and a hex ring at the other using Alibre Design PE. The M3 nuts measured 5.4 mm across flats and 2.3 mm thick, so I increased the gap by 0.5mm for easy fitting. After exporting an STL file, I printed a pair of spanners, although they may not look clean due to my new machine's calibration. As my own design, I am proud of it and have uploaded the Alibre model file for anyone with Alibre PE to modify or download the STL file for printing two spanners to hold both bolt head and nut.