Metric Nutdrivers - Screwdrivers for nuts!
Plastic spanners are just fine for model building. I became frustrated trying to find the correct socket to fit a nut from my many sockets most of which I have never used.
Here are my Nutdrivers to fit nuts and bolts ranging from 4mm to 13mm across flats. Just print the ones that you need. I suggest the 5.5mm for M3 bolts, 7mm for M4 bolts, 8mm for M5 bolts and 10mm for M6 bolts.
You may also like to print the 1/4 inch Nutdriver from my Imperial Nutdriver set thing:3834312 to fit metal screwdriver heads. There is also a 1/4 inch key which fits quarter inch drive metal sockets.
Print my Nutdriver Stand to keep your Nutdrivers tidy thing:3834317.
Print in PLA or PETG for good layer adhesion. Do not use ABS which is likely to break up in use.
0.20 or 0.25 layer height
. PLA or PETG