Can I replace 16 teeth timing pulley with 20 teeth

[JKStewart (Jonathan K Stewart)]

Just realized the “Solution” didn’t get copied. Here it is, hopefully:

Newb needs help w/changing configuration.h

You can send M92 X80 Y80, which will change the setting until Marlin restarts. You can send M500 to save any settings you’ve changed to EEPROM, which will make it persistent across restarts. You can do all of that from Repetier Host, or any other console (octoprint, cncjs, pronterface, etc.). Some settings can’t be changed through GCode like that, but there are a lot of settings that can. I think the most common things people might change are: Max feedrates, Max accelerations, Stepper driver…