Hole and tolerance design in 3D Printing - Mini Project: Build & Apply

Hole and Tolerance Design for 3D Printing

📖 Scenario: You are designing a simple part with holes for screws using 3D printing. Holes in 3D printed parts often need to be slightly larger than the screw size to fit properly because of printing accuracy and material expansion.Understanding how to set hole sizes and tolerances is important to ensure your screws fit well without being too loose or too tight.

🎯 Goal: Build a step-by-step hole and tolerance design guide for a 3D printed part. You will create a list of hole sizes, define a tolerance value, calculate adjusted hole sizes, and finalize the design with recommended hole diameters.

📋 What You'll Learn

Create a list of exact hole diameters in millimeters

Define a tolerance value in millimeters

Calculate adjusted hole sizes by adding tolerance to each hole diameter

Present the final recommended hole sizes for printing

💡 Why This Matters

🌍 Real World

3D printed parts often require holes that fit screws or pins. Designing holes with proper tolerance ensures parts fit together well without forcing or looseness.

💼 Career

Mechanical designers and engineers use hole and tolerance design to create functional 3D printed parts that assemble correctly and perform reliably.

1

Create the list of hole diameters

Create a list called hole_diameters with these exact values in millimeters: 3.0, 4.5, 6.0, 8.0.

3D Printing

# Create the list hole_diameters with the exact values
# Your code here

Need a hint?

Use square brackets to create a list and separate values with commas.

2

Define the tolerance value

Create a variable called tolerance and set it to 0.2 millimeters to represent the extra size added to each hole for fitting.

3D Printing

hole_diameters = [3.0, 4.5, 6.0, 8.0]
# Define the tolerance variable
# Your code here

Need a hint?

Use a simple assignment to create the tolerance variable.

3

Calculate adjusted hole sizes

Create a new list called adjusted_holes that adds the tolerance to each value in hole_diameters. Use a list comprehension with for diameter in hole_diameters.

3D Printing

hole_diameters = [3.0, 4.5, 6.0, 8.0]
tolerance = 0.2
# Create adjusted_holes list adding tolerance to each diameter
# Your code here

Need a hint?

Use a list comprehension to add tolerance to each hole diameter.

4

Finalize the recommended hole sizes

Create a dictionary called recommended_holes that maps each original hole diameter (key) to its adjusted hole size (value) using a dictionary comprehension with for diameter, adjusted in zip(hole_diameters, adjusted_holes).

3D Printing

hole_diameters = [3.0, 4.5, 6.0, 8.0]
tolerance = 0.2
adjusted_holes = [diameter + tolerance for diameter in hole_diameters]
# Create recommended_holes dictionary mapping original to adjusted sizes
# Your code here

Need a hint?

Use dictionary comprehension with zip to pair original and adjusted sizes.