Choice of lead for lead screw This video brought to my attention the 8 mm lead of the Ender 3's Z axis screw, which seems like an exceedingly bad choice from a standpoint of accuracy with respect to common grid alignments in the Z direction. In particular, with the stepper having 200 full steps per rotation, the 8 mm lead consumes all the powers of two out of 200, leaving 25 full steps per mm - and 25ths of a mm are not a typical unit that layer heights/feature heights are going to be in. It seems like a 5 mm lead would be ideal, giving you 40 steps per mm, evenly divisible by 3 powers of 2 and one power of 5, for exact tenths and exact eights.

Is there a motivation behind the choice of 8 mm lead? Is this common for other printers, and are there printers that use a 5 mm lead, or 5 mm replacements that work well?
I've not seen trapezoid lead screws with 5&nbsp;mm lead, you can get 5&nbsp;mm lead ball screws though.

On one printer I use 4&nbsp;mm lead screws to get native 0.02&nbsp;mm resolution (so 5 full steps for 0.1&nbsp;mm, 10 for 0.2&nbsp;mm, etc.). I also geared down 8&nbsp;mm lead screws with a 2:1 ratio (e.g. to use a single Z-stepper driving a belt that drives 2 lead screws), works fine.