Manual G-code modifications in 3D Printing - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is G-code in 3D printing?

G-code is a set of instructions that tells a 3D printer how to move, where to move, and how fast to move. It controls the printing process step-by-step.

beginner

Why would you manually modify G-code?

You might change G-code manually to fix printing errors, adjust print speed, change temperatures, or customize specific movements for better print quality.

beginner

What does the G1 command do in G-code?

G1 tells the printer to move in a straight line to a specified position at a set speed. It is used for controlled movements during printing.

intermediate

How can you safely edit G-code without causing print failures?

Always back up the original file, make small changes, understand what each command does, and test the modified code on a small print before a full print.

intermediate

What is the effect of changing the temperature commands (M104, M109) in G-code?

M104 sets the extruder temperature without waiting, while M109 sets the temperature and waits until it is reached before continuing. Changing these affects how the filament melts and prints.

What does the G28 command do in G-code?

A Moves the print head to a specific coordinate

B Starts the print

C Sets the extruder temperature

D Homes all axes to their origin

G28 moves all printer axes to their home position, usually the origin point.

Which command sets the extruder temperature and waits until it is reached?

A M104

B M140

C M109

D G1

M109 sets the extruder temperature and pauses the print until the temperature is reached.

Why should you back up your original G-code file before editing?

A To prevent losing the original if edits cause errors

B To share it with friends

C To speed up printing

D To reduce file size

Backing up ensures you can restore the original if your changes cause problems.

What is a common reason to manually edit G-code?

A To adjust print speed or fix errors

B To change the color of the filament

C To change the printer brand

D To increase the file size

Manual edits often fix errors or customize print speed and movements.

What does the G1 command control?

A Temperature settings

B Straight line movement

C Fan speed

D Pause the print

G1 commands the printer to move in a straight line to a specified position.

Explain why and how you would manually modify a G-code file for a 3D print.

Think about improving print quality or fixing issues.

Describe the difference between M104 and M109 commands in G-code.

Focus on how the printer handles temperature changes.