Reading G-code for troubleshooting in 3D Printing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

3D Printing

G1 X[1] F1500

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

A50

B100

C0

D150

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value too large or too small for the printer's bed size.

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 200°C.

3D Printing

M104 S[1]

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

A180

B250

C220

D200

Attempts:

3 left

💡 Hint

Common Mistakes

Setting temperature too low or too high for the filament.

Confusing M104 with other temperature commands.

The command M104 S200 sets the extruder temperature to 200°C.

3fill in blank

hard

Fix the error in the code to home all axes.

3D Printing

[1]

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

AG1

BG28

CM104

DM140

Attempts:

3 left

💡 Hint

Common Mistakes

Using movement commands instead of homing.

Confusing temperature commands with homing.

The command G28 homes all axes to their origin positions.

4fill in blank

hard

Fill both blanks to set bed temperature to 60°C and wait until it reaches the temperature.

3D Printing

M140 S[1]
M190 S[2]

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

A60

B50

D70

Attempts:

3 left

💡 Hint

Common Mistakes

Using different temperatures for setting and waiting.

Confusing bed temperature commands with extruder temperature.

M140 S60 sets the bed temperature to 60°C without waiting.
M190 S60 waits until the bed reaches 60°C before continuing.

5fill in blank

hard

Fill all three blanks to create a dictionary of axis positions where keys are axis names in uppercase and values are their coordinates, but only include axes with coordinates greater than 0.

3D Printing

positions = { [1]: [2] for [3] in ['x', 'y', 'z'] if [2] > 0 }

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

Aaxis.upper()

Bcoords[axis]

Caxis

Dcoords

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase keys instead of uppercase.

Not filtering axes with coordinates greater than zero.

Mixing variable names incorrectly.

This dictionary comprehension creates keys as uppercase axis names and values as their coordinates from the coords dictionary, including only axes with positive coordinates.

Practice

1. What does the G-code command G1 X50 Y25 instruct the 3D printer to do?

easy

A. Move the print head to coordinates X=50 and Y=25

B. Set the temperature to 50°C and 25°C

C. Start the print job from layer 50 to 25

D. Pause the printer for 50 seconds and then 25 seconds

Solution

1. Step 1: Understand the G1 command

   The G1 command is used to move the print head to a specific position.

2. Step 2: Interpret the coordinates

   X50 and Y25 mean move the print head to X=50 units and Y=25 units on the print bed.

3. Final Answer:

   Move the print head to coordinates X=50 and Y=25 -> Option A

4. Quick Check:

   G1 moves print head = Move to X=50 Y=25 [OK]

Hint: G1 moves print head to given coordinates [OK]

Common Mistakes:

• Confusing G1 with temperature commands
• Thinking G1 pauses the printer
• Assuming G1 controls print speed only

2. Which of the following is the correct syntax to set the extruder temperature to 210°C in G-code?

easy

A. G1 T210

B. G28 S210

C. M104 S210

D. M109 X210

Solution

1. Step 1: Identify the temperature command

   M104 is the G-code command used to set the extruder temperature without waiting.

2. Step 2: Check the syntax

   S210 means set temperature to 210°C. So, M104 S210 sets extruder temperature to 210°C.

3. Final Answer:

   M104 S210 -> Option C

4. Quick Check:

   M104 sets temp with S value = M104 S210 [OK]

Hint: M104 sets extruder temp; S is temperature value [OK]

Common Mistakes:

• Using G28 which is for homing axes
• Confusing M109 which waits for temp
• Using wrong letter like X or T for temperature

3. Given this G-code snippet:

G28
M104 S200
G1 X100 Y100 E10 F1500
M109 S200

What does the command G1 X100 Y100 E10 F1500 do?

medium

A. Homes all axes and waits for temperature 200°C

B. Moves the print head to X=100, Y=100 while extruding 10 units of filament at speed 1500

C. Sets the extruder temperature to 100°C and moves at speed 1500

D. Pauses the print for 10 seconds at position X=100, Y=100

Solution

1. Step 1: Understand the G1 command with parameters

   G1 moves the print head. X100 Y100 sets position. E10 means extrude 10 units of filament. F1500 sets movement speed.

2. Step 2: Combine all parts

   The command moves the head to X=100, Y=100 while pushing 10 units of filament out at speed 1500 mm/min.

3. Final Answer:

   Moves the print head to X=100, Y=100 while extruding 10 units of filament at speed 1500 -> Option B

4. Quick Check:

   G1 with X,Y,E,F moves and extrudes at speed [OK]

Hint: G1 with E extrudes filament while moving [OK]

Common Mistakes:

• Thinking E means temperature
• Confusing F as filament amount
• Assuming G1 only moves without extruding

4. You see this G-code line causing a print error:
M104 S-10
What is the problem and how to fix it?

medium

A. Temperature cannot be negative; change S-10 to a positive value like S210

B. M104 cannot be used for temperature; replace with G1 command

C. The command is missing a wait; add M109 before M104

D. S-10 means wait 10 seconds; replace with S10 to fix

Solution

1. Step 1: Identify invalid temperature value

   Temperature values must be positive. S-10 is invalid because temperature cannot be negative.

2. Step 2: Correct the temperature value

   Change S-10 to a valid positive temperature like S210 to fix the error.

3. Final Answer:

   Temperature cannot be negative; change S-10 to a positive value like S210 -> Option A

4. Quick Check:

   Temperature must be positive = fix S-10 to S210 [OK]

Hint: Temperature values must be positive numbers [OK]

Common Mistakes:

• Thinking negative temperature means wait time
• Confusing M104 with movement commands
• Adding wrong commands instead of fixing value

5. You want to troubleshoot a print where the filament is not extruding properly. Which G-code command should you check first to verify the extrusion amount?

hard

A. M109 commands waiting for temperature

B. M104 commands setting temperature

C. G28 commands for homing axes

D. G1 commands with the E parameter

Solution

1. Step 1: Identify extrusion control in G-code

   The E parameter in G1 commands controls how much filament is pushed out (extruded).

2. Step 2: Focus on G1 commands with E values

   Checking these commands helps verify if the printer is instructed to extrude filament properly.

3. Final Answer:

   G1 commands with the E parameter -> Option D

4. Quick Check:

   Extrusion controlled by G1 E values = check G1 E commands [OK]

Hint: Extrusion amount is set by E in G1 commands [OK]

Common Mistakes:

• Checking temperature commands instead of extrusion
• Confusing homing commands with extrusion
• Assuming M109 controls extrusion amount