Rabbit Hole Vol.3: What Your Printer Actually Gets — G-code Explained

When you hit Print, your printer doesn't get a shape. It gets a list of moves: go here, this fast, push this much plastic, at this temperature. This episode starts from a single line of G-code and digs three layers down: reading the line, how the slicer writes it, and how firmware turns it into thousands of stepper pulses (acceleration, look-ahead, CoreXY, pressure advance). Plus: is G-code even code? Four quiz questions at the end. 0:00 Intro 0:35 What G-code is: what G and M stand for 2:04 Why it exists: punched tape, 1952 3:53 Layer 1: reading one line 5:52 Layer 2: how the slicer writes it 7:04 Layer 3: how firmware turns a line into motor steps 9:17 Interlude: is G-code really code? 10:15 What it means for you 11:00 Quiz Sources: Wikipedia · G-code https://en.wikipedia.org/wiki/G-code NIST RS274/NGC Interpreter, Version 3 (Kramer, Proctor, Messina, 2000) RepRap wiki · G-code https://reprap.org/wiki/G-code Klipper docs · Kinematics https://www.klipper3d.org/Kinematics.... Klipper docs · Pressure Advance https://www.klipper3d.org/Pressure_Ad... Klipper docs · Command Templates https://www.klipper3d.org/Command_Tem... LinuxCNC · O-codes https://linuxcnc.org/docs/html/gcode/... Duet3D · G-code meta commands https://docs.duet3d.com/User_manual/R... Marlin · M600 https://marlinfw.org/docs/gcode/M600....