Print bed leveling (manual and auto) in 3D Printing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start manual bed leveling on a 3D printer.

3D Printing

G28 ; Home all axes
G29 [1] ; Start manual bed leveling

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

AM0

BS0

CP1

DZ1

Attempts:

3 left

💡 Hint

Common Mistakes

Using G29 without parameters starts automatic leveling, not manual.

Confusing G28 (homing) with leveling commands.

The command G29 P1 starts manual bed leveling on many 3D printers, prompting the user to adjust the bed at specific points.

2fill in blank

medium

Complete the code to run automatic bed leveling on a 3D printer.

3D Printing

G28 ; Home all axes
[1] ; Run automatic bed leveling

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

AG29

BM104 S200

CG1 Z0.2

DM106 S255

Attempts:

3 left

💡 Hint

Common Mistakes

Using temperature commands like M104 instead of leveling commands.

Confusing fan control commands with leveling.

The command G29 runs automatic bed leveling, where the printer probes multiple points on the bed to adjust leveling automatically.

3fill in blank

hard

Fix the error in the manual leveling command to correctly start the process.

3D Printing

G28 ; Home all axes
G29 [1] ; Start manual bed leveling

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

AP0

BZ0

CS1

DP1

Attempts:

3 left

💡 Hint

Common Mistakes

Using P0 which may disable leveling.

Using parameters unrelated to leveling.

The correct parameter to start manual bed leveling is P1. Using P0 or others will not initiate manual leveling.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps bed points to their Z-offsets during leveling.

3D Printing

bed_offsets = { [1]: probe_data[[2]] for [1] in points if probe_data[[2]] != 0 }

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

Apoint

Bz_offset

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for key and index causing errors.

Using variables not defined in the comprehension.

The dictionary comprehension uses point as the key and accesses probe_data[point] as the value to map bed points to their Z-offsets.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that stores adjusted Z values for points with positive offsets.

3D Printing

adjusted_offsets = { [1]: [2] - [3] for [1], [2] in probe_points.items() if [2] > 0 }

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

Apoint

Boffset

Cbed_level_offset

Dprobe_points

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing variable names for keys and values.

Using the wrong variable for subtraction.

The comprehension iterates over probe_points items, using point as key and offset as value, subtracting bed_level_offset for positive offsets.

Practice

1. What is the main purpose of print bed leveling in 3D printing?

easy

A. To ensure the nozzle is the correct distance from the bed for good adhesion

B. To change the filament color automatically

C. To speed up the printing process

D. To cool down the printer after printing

Solution

1. Step 1: Understand print bed leveling purpose

   Print bed leveling adjusts the distance between the nozzle and the bed to ensure the first layer sticks well.

2. Step 2: Eliminate unrelated options

   Changing filament color, speeding printing, or cooling are unrelated to bed leveling.

3. Final Answer:

   To ensure the nozzle is the correct distance from the bed for good adhesion -> Option A

4. Quick Check:

   Bed leveling = correct nozzle distance [OK]

Hint: Bed leveling = nozzle distance for good first layer [OK]

Common Mistakes:

• Confusing bed leveling with filament change
• Thinking it controls print speed
• Assuming it cools the printer

2. Which tool is commonly used during manual print bed leveling?

easy

A. A ruler to measure bed thickness

B. A hammer to tap the bed

C. A screwdriver to adjust screws and a piece of paper to check nozzle distance

D. A paintbrush to clean the bed

Solution

1. Step 1: Identify manual leveling tools

   Manual leveling uses screws under the bed adjusted with a screwdriver and paper to feel the nozzle gap.

2. Step 2: Remove incorrect tools

   Hammer, ruler, and paintbrush are not used for leveling adjustments.

3. Final Answer:

   A screwdriver to adjust screws and a piece of paper to check nozzle distance -> Option C

4. Quick Check:

   Manual leveling = screwdriver + paper [OK]

Hint: Manual leveling uses screws and paper to check gap [OK]

Common Mistakes:

• Using a hammer instead of screwdriver
• Measuring bed thickness instead of nozzle gap
• Confusing cleaning tools with leveling tools

3. Consider this pseudo-code for auto bed leveling:

for each point in bed_points:
  sensor_value = probe_bed(point)
  store(sensor_value)
calculate_bed_mesh()
apply_mesh_compensation()

What is the main output of this process?

medium

A. A map of bed height variations to adjust nozzle during printing

B. A list of filament colors used

C. The print speed settings

D. The temperature of the print bed

Solution

1. Step 1: Understand auto leveling steps

   The code probes multiple points on the bed to measure height differences and stores these values.

2. Step 2: Identify output use

   The stored values create a mesh that compensates nozzle height during printing for a level first layer.

3. Final Answer:

   A map of bed height variations to adjust nozzle during printing -> Option A

4. Quick Check:

   Auto leveling output = bed height map [OK]

Hint: Auto leveling creates height map for nozzle adjustment [OK]

Common Mistakes:

• Confusing bed mesh with filament or speed settings
• Thinking sensor measures temperature
• Ignoring mesh compensation purpose

4. A user runs auto bed leveling but notices the first layer is still uneven. Which is the most likely cause?

medium

A. The print speed is too slow

B. The filament is the wrong color

C. The printer is overheating

D. The sensor was not properly calibrated before probing

Solution

1. Step 1: Analyze auto leveling failure reasons

   If the first layer is uneven despite auto leveling, the sensor calibration is often the cause.

2. Step 2: Exclude unrelated factors

   Filament color, print speed, and overheating do not directly affect bed leveling accuracy.

3. Final Answer:

   The sensor was not properly calibrated before probing -> Option D

4. Quick Check:

   Uneven first layer = sensor calibration issue [OK]

Hint: Check sensor calibration if auto leveling fails [OK]

Common Mistakes:

• Blaming filament color for leveling issues
• Assuming print speed affects leveling
• Ignoring sensor calibration step

5. A 3D printer has a slightly warped bed causing uneven print adhesion. Which approach best solves this problem?

hard

A. Only manually level the bed once before every print

B. Use auto bed leveling with mesh compensation to adjust nozzle height dynamically

C. Increase print speed to reduce adhesion time

D. Change filament type to a more adhesive one

Solution

1. Step 1: Understand warped bed issue

   A warped bed has uneven height that manual leveling alone may not fully fix.

2. Step 2: Identify best leveling method

   Auto leveling with mesh compensation adjusts nozzle height dynamically during printing to match bed shape.

3. Step 3: Exclude ineffective options

   Manual leveling once is insufficient; print speed and filament type do not fix bed warping.

4. Final Answer:

   Use auto bed leveling with mesh compensation to adjust nozzle height dynamically -> Option B

5. Quick Check:

   Warped bed = auto leveling mesh compensation [OK]

Hint: Warped bed? Use auto leveling mesh compensation [OK]

Common Mistakes:

• Relying only on manual leveling for warped beds
• Thinking print speed fixes adhesion
• Changing filament instead of leveling