/diy/ - Do It Yourself

>>2595645
You'd generally have to connect the printer to a computer with a USB cable and send the command from a terminal or printer controller.
It retrieves your firmware settings, all of them.
picrel is an example of an M503 result from one of my shitbox printers.
Unfortunately it doesn't save to the SD card or anything like that, just spits it out over the serial connection.

Yes, it sounds like your Jerk, Acceleration, or Junction Deviation got messed with.
It's also possible your Max Acceleration was changed.
Some printers support "silent" or "stealth" mode, it's just firmware shit so it's possible the Super Racer has such a thing, I wouldn't know. Worth knowing for sure.

It's possible your "fast" profile isn't actually putting the right commands to set your accel/jerk/etc in your gcode. You might share a sliced gcode file, that'd show me your Cura settings at least.

Ideally, I'd highly recommend just not using Cura. That's always the best solution for Cura related issues.