Under-extrusion and over-extrusion in 3D Printing - Mini Project: Build & Apply

Understanding Under-extrusion and Over-extrusion in 3D Printing

📖 Scenario: You are learning how to identify and fix common 3D printing problems related to extrusion. Extrusion means how much plastic the printer pushes out to make the object. Sometimes the printer pushes out too little plastic (under-extrusion) or too much plastic (over-extrusion), which affects the print quality.

🎯 Goal: Build a simple checklist that helps you understand and spot under-extrusion and over-extrusion issues in 3D prints. You will create a list of symptoms, causes, and fixes for each problem.

📋 What You'll Learn

Create a dictionary with keys 'under_extrusion' and 'over_extrusion' each holding a list of symptoms

Add a variable for the common cause of extrusion problems

Write nested loops to iterate over each problem type and its symptoms

Add a final summary statement about extrusion issues

💡 Why This Matters

🌍 Real World

3D printing hobbyists and professionals often face extrusion problems that affect print quality. Understanding symptoms helps in troubleshooting and improving prints.

💼 Career

Technicians and engineers working with 3D printers need to identify extrusion issues quickly to maintain efficient production and reduce material waste.

1

Create the extrusion problems dictionary

Create a dictionary called extrusion_problems with two keys: 'under_extrusion' and 'over_extrusion'. Assign to 'under_extrusion' the list ['gaps in layers', 'thin or missing lines', 'weak prints'] and to 'over_extrusion' the list ['blobs on surface', 'stringing', 'thick lines'].

3D Printing

# Create the extrusion_problems dictionary with symptoms lists
# Your code here

Need a hint?

Use curly braces {} to create a dictionary. Use square brackets [] for the lists of symptoms.

2

Add the common cause variable

Create a variable called common_cause and set it to the string 'incorrect extrusion multiplier', which is a frequent reason for both under-extrusion and over-extrusion.

3D Printing

extrusion_problems = {
    'under_extrusion': ['gaps in layers', 'thin or missing lines', 'weak prints'],
    'over_extrusion': ['blobs on surface', 'stringing', 'thick lines']
}
# Create the common_cause variable
# Your code here

Need a hint?

Assign the exact string to the variable common_cause.

3

Loop through problems and symptoms

Write a for loop using variables problem and symptoms to iterate over extrusion_problems.items(). Inside the loop, write another for loop with variable symptom to go through each symptom in symptoms. (You do not need to print or return anything.)

3D Printing

extrusion_problems = {
    'under_extrusion': ['gaps in layers', 'thin or missing lines', 'weak prints'],
    'over_extrusion': ['blobs on surface', 'stringing', 'thick lines']
}
common_cause = 'incorrect extrusion multiplier'

# Loop through extrusion_problems and symptoms
# Your code here

Need a hint?

Use extrusion_problems.items() to get both keys and values. Then loop over each symptom in the list.

4

Add the final summary statement

Add a variable called summary and set it to the string 'Adjusting the extrusion multiplier helps fix both under-extrusion and over-extrusion issues.' to complete the checklist.

3D Printing

extrusion_problems = {
    'under_extrusion': ['gaps in layers', 'thin or missing lines', 'weak prints'],
    'over_extrusion': ['blobs on surface', 'stringing', 'thick lines']
}
common_cause = 'incorrect extrusion multiplier'

for problem, symptoms in extrusion_problems.items():
    for symptom in symptoms:
        pass

# Add the summary variable
# Your code here

Need a hint?

Use the exact string and variable name summary.