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diff --git a/docs/FAQ.md b/docs/FAQ.md index fb92b32f..83bc41a0 100644 --- a/docs/FAQ.md +++ b/docs/FAQ.md @@ -38,6 +38,14 @@ each motor driver pulse. It can also be calculated from the axis pitch, motor step angle, and driver microstepping. If unsure, do a web search for "calculate steps per mm" to find an online calculator. +Klipper uses step_distance instead of steps_per_mm in order to use +consistent units of measurement in the config file. (The config uses +millimeters for all distance measurements.) It is believed that +steps_per_mm originates from a micro-optimization on old 8-bit +micro-controllers (the desire to use a multiply instead of a divide in +some low-level code). Continuing to configure this one distance in +units of "inverse millimeters" is felt to be quirky and unnecessary. + ### Where's my serial port? The general way to find a USB serial port is to run `ls -l |