When i was building stuff out of timber i would typically only work in mm (or metres for longer lengths (timber is sold in full lenths of 6 metres or shorter bi

When i was building stuff out of timber i would typically only work in mm (or metres for longer lengths (timber is sold in full lenths of 6 metres or shorter bits at various lengths (at least in .au)) and don't need any further precision. a 334 mm length will quite happily go in a 333mm gap. though again i'm not a professional carpenter i just worked with my father a lot.