Manual G-code modifications in 3D Printing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to move the print head to X=50.

3D Printing

G1 X[1] F1500

Drag options to blanks, or click blank then click option'

A100

B50

C0

D150

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value outside the printer's build area.

Confusing feed rate with position.

The command G1 X50 F1500 moves the print head to X=50 at a feed rate of 1500 mm/min.

2fill in blank

medium

Complete the code to set the extruder temperature to 210°C.

3D Printing

M104 S[1]

Drag options to blanks, or click blank then click option'

A190

B180

C230

D210

Attempts:

3 left

💡 Hint

Common Mistakes

Setting temperature too low or too high for the filament.

Confusing M104 with M109 (which waits for temperature).

The command M104 S210 sets the extruder temperature to 210°C without waiting.

3fill in blank

hard

Fix the error in the code to home all axes.

3D Printing

G28 [1]

Drag options to blanks, or click blank then click option'

AX Y Z

BX Y

CZ

DA B C

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid axis letters like A, B, C.

Forgetting to include all axes to home.

The command G28 X Y Z homes all three axes: X, Y, and Z.

4fill in blank

hard

Fill both blanks to create a command that moves the print head to Y=100 and sets feed rate to 1200.

3D Printing

G1 Y[1] F[2]

Drag options to blanks, or click blank then click option'

A100

B1200

C1500

D50

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up feed rate and position values.

Using feed rates too high for safe printing.

The command G1 Y100 F1200 moves the print head to Y=100 at a feed rate of 1200 mm/min.

5fill in blank

hard

Fill all three blanks to create a dictionary that maps axis names to their target positions if the position is greater than 0.

3D Printing

{'X': [1], 'Y': [2], 'Z': [3]

Drag options to blanks, or click blank then click option'

A50

B100

C0

D150

Attempts:

3 left

💡 Hint

Common Mistakes

Using negative or invalid position values.

Confusing axis names or values.

This dictionary sets X to 50, Y to 100, and Z to 0. Positions greater than 0 indicate movement targets.

Practice

1. What is the main purpose of manually editing G-code in 3D printing?

easy

A. To increase the printer's physical size

B. To change the filament color automatically

C. To customize printer actions beyond slicer settings

D. To update the printer's firmware

Solution

1. Step 1: Understand what G-code controls

   G-code commands tell the printer how to move, heat, and print.

2. Step 2: Identify the effect of manual edits

   Editing G-code manually lets you change these commands beyond what slicer software sets.

3. Final Answer:

   To customize printer actions beyond slicer settings -> Option C

4. Quick Check:

   Manual G-code editing = Customizing printer actions [OK]

Hint: Manual edits change printer commands directly [OK]

Common Mistakes:

• Thinking it changes physical printer parts
• Confusing G-code editing with firmware updates
• Assuming it changes filament color automatically

2. Which of the following is a correct G-code command to pause a print?

easy

A. M104 S0

B. G28

C. G1 X10 Y10

D. M25

Solution

1. Step 1: Identify pause commands in G-code

   M25 is commonly used to pause SD card printing.

2. Step 2: Check other commands

   M104 S0 sets temperature to 0, G28 homes axes, G1 moves the nozzle.

3. Final Answer:

   M25 -> Option D

4. Quick Check:

   Pause command = M25 [OK]

Hint: Pause print with M25 command [OK]

Common Mistakes:

• Confusing M104 (temperature) with pause
• Thinking G28 (home) pauses print
• Using movement commands to pause

3. Given this G-code snippet:

G1 X50 Y50 F1500
M104 S210
G4 P2000

What does the command G4 P2000 do?

medium

A. Moves the nozzle to X=2000

B. Pauses the print for 2 seconds

C. Sets the temperature to 2000°C

D. Homes all axes

Solution

1. Step 1: Understand G4 command

   G4 is a dwell command that pauses the printer for a set time.

2. Step 2: Interpret parameter P2000

   P2000 means pause for 2000 milliseconds, which equals 2 seconds.

3. Final Answer:

   Pauses the print for 2 seconds -> Option B

4. Quick Check:

   G4 P2000 = 2-second pause [OK]

Hint: G4 with P value pauses in milliseconds [OK]

Common Mistakes:

• Thinking G4 moves the nozzle
• Confusing temperature commands with G4
• Assuming G4 homes axes

4. You want to slow down the print speed by editing the G-code. Which line correctly changes the feedrate to 1200 mm/min?

medium

A. G1 F1200

B. M220 S1200

C. G28 F1200

D. M104 F1200

Solution

1. Step 1: Identify feedrate command

   G1 with F sets the feedrate (speed) for moves.

2. Step 2: Check other commands

   M220 changes speed multiplier, G28 homes axes (no feedrate), M104 sets temperature.

3. Final Answer:

   G1 F1200 -> Option A

4. Quick Check:

   Feedrate set by G1 F value [OK]

Hint: Use G1 F to set move speed directly [OK]

Common Mistakes:

• Using M220 which is a speed multiplier, not direct feedrate
• Trying to set feedrate with G28 or M104
• Confusing feedrate with temperature commands

5. You want to add a pause at layer 5 in your print by inserting a manual G-code command. Which approach is best?

hard

A. Insert M25 after the layer 5 start comment in the G-code file

B. Replace all G1 commands with M25 in layer 5

C. Add M104 S0 at the start of layer 5

D. Delete the commands for layer 5 to pause printing

Solution

1. Step 1: Identify how to pause at a specific layer

   Layer changes are usually marked by comments; inserting M25 pauses the print.

2. Step 2: Evaluate other options

   Replacing all G1 commands breaks movement, M104 S0 turns off temperature, deleting commands stops printing.

3. Final Answer:

   Insert M25 after the layer 5 start comment in the G-code file -> Option A

4. Quick Check:

   Pause at layer = Insert M25 at layer start [OK]

Hint: Insert M25 at layer start comment to pause [OK]

Common Mistakes:

• Replacing movement commands with pause command
• Turning off temperature instead of pausing
• Deleting commands which stops print instead of pausing