Session 6: “Hands-On Experience: Evaluating Our Prints”
Architect:
Syed Shayaan Haider - Markhor3D
Session Overview
In this session, Grade 5 students will engage in evaluating their 3D printed objects to understand the quality and accuracy of their designs. They will learn to identify key features such as layer lines, top and bottom layers, and wall thickness. Additionally, students will inspect their prints for any leftover artifacts from supports and practice measuring their printed objects to ensure they match the intended dimensions. This hands-on experience will help students recognize the importance of precision in 3D printing and improve their future designs.
Learning Objectives
By the end of the session, Grade 5 students will:
- Identify Layer Lines: Understand what layer lines are and how they appear on printed objects.
- Examine Top and Bottom Layers: Learn to recognize the top and bottom layers of their prints and assess their quality.
- Assess Wall Thickness: Evaluate the walls of their models to ensure they are sturdy and meet design specifications.
- Detect Artifacts from Supports: Identify any leftover pieces or marks from supports used during printing.
- Measure Printed Objects: Use measuring tools to check the dimensional accuracy of their prints against their original designs.
- Provide Constructive Feedback: Share observations and suggestions for improving future prints.
Teaching Aids
Visual Aids:
- Printed Examples: Showcase various printed objects highlighting layer lines, top/bottom layers, walls, and support artifacts.
- Demonstration Videos: Short clips demonstrating how to inspect and measure printed objects.
- Step-by-Step Guides: Simple slides or handouts outlining the evaluation process.
- Infographics: Visual guides explaining common printing artifacts and measurement techniques.
Required Equipment:
- Printed Objects:
- Each student’s 3D printed model.
- Additional samples with common printing issues for comparison.
- Measuring Tools:
- Rulers or digital calipers suitable for measuring small dimensions.
- Computers or Tablets:
- For accessing demonstration videos and digital guides.
- Interactive Whiteboard or Projector:
- For live demonstrations and displaying examples.
- Notebooks and Pens:
- For students to take notes on their observations and measurements.
- Assistants or Volunteers:
- Additional adults to help guide students through the evaluation process.
Structure and Lesson Plan (Total Time: 60 minutes)
1. Introduction and Linking to Previous Sessions (5 minutes)
- Greet the Students:
- “Good morning, Grade 5! Today, we’re going to take a closer look at the objects you 3D printed and learn how to evaluate their quality and accuracy.”
- Recap Previous Sessions:
- “Last time, you finalized your designs and prepared them for printing. Now, you have your printed objects, and it’s time to see how well your designs turned out.”
- Present the Session Overview:
- “We’ll learn how to identify layer lines, examine the top and bottom layers, check the wall thickness, look for any leftover support pieces, and measure your prints to ensure they match your designs.”
2. Identifying and Understanding Layer Lines (10 minutes)
- Explain Layer Lines:
- “Layer lines are the lines you see on your printed object where each new layer of plastic was added. They show how the printer built your model from the bottom up.”
- Show Example Models:
- “Look at these printed objects. Notice the horizontal lines running across them. These are the layer lines.”
- Discussion:
- “Why do you think layer lines appear on 3D printed objects? How do they affect the look and feel of your model?”
- Hands-On Activity:
- “Examine your printed object and identify the layer lines. Discuss with a partner how visible they are and what you can do to make them less noticeable in future prints.”
3. Examining Top and Bottom Layers (10 minutes)
- Explain Top and Bottom Layers:
- “The top layer is the very last layer printed, and the bottom layer is the first one that touches the print bed. These layers are important for the overall finish of your object.”
- Show Example Models:
- “Here is a model with smooth top and bottom layers. Compare it to one with rough or uneven layers.”
- Discussion:
- “How do the top and bottom layers affect the appearance and functionality of your object?”
- Hands-On Activity:
- “Look closely at the top and bottom of your printed object. Are they smooth or rough? What might have caused any imperfections?”
4. Assessing Wall Thickness (10 minutes)
- Explain Wall Thickness:
- “Wall thickness refers to how thick the walls of your model are. Thicker walls make your object stronger and more durable.”
- Show Example Models:
- “Compare these two boxes. Notice how the one with thicker walls feels sturdier than the one with thin walls.”
- Discussion:
- “Why is it important to have the right wall thickness in your designs?”
- Hands-On Activity:
- “Measure the walls of your printed object using a ruler or caliper. Check if they match the thickness you set in your design.”
5. Detecting Artifacts from Supports (10 minutes)
- Explain Support Artifacts:
- “Supports are structures added during printing to hold up parts of your model that hang in the air. Sometimes, small pieces of supports are left on your printed object.”
- Show Example Models:
- “Here is a model with some leftover support pieces. These can be cleaned off to make your object look better.”
- Discussion:
- “What can you do to minimize or remove support artifacts from your prints?”
- Hands-On Activity:
- “Inspect your printed object for any leftover support pieces. If you find any, carefully remove them using tweezers or pliers.”
6. Measuring Printed Objects for Dimensional Accuracy (10 minutes)
- Explain Dimensional Accuracy:
- “Dimensional accuracy means how closely your printed object matches the size and shape you designed in TinkerCad.”
- Show Example Models:
- “Compare the dimensions of your design sketch with the printed object. Are they the same?”
- Hands-On Activity:
- “Use a ruler or caliper to measure different parts of your printed object. Compare these measurements to the dimensions you set in your paper design and TinkerCad model.”
- Discussion:
- “Did your printed object match your design? What differences did you notice, and why might they have occurred?”
7. Sharing Observations and Feedback (5 minutes)
- Invite Students to Share:
- “Would anyone like to share what they observed about their prints? Did you find any layer lines, support artifacts, or differences in dimensions?”
- Provide Positive Feedback:
- “Great job identifying the layer lines on your phone holder! Your measurements are very accurate.”
- “I love how you cleaned off the support pieces from your desk organizer. It looks much neater now.”
- Encourage Peer Feedback:
- “Listen to your classmates’ observations and think about what you learned from their experiences. How can you apply this to improve your future prints?”
8. Conclusion and Next Steps (5 minutes)
- Summarize the Session:
- “Today, you learned how to evaluate your printed objects by looking at layer lines, top and bottom layers, wall thickness, and support artifacts. You also practiced measuring your prints to ensure they match your designs.”
- Preview Next Session:
- “In our next class, we’ll dive into post-processing techniques to make your prints even better, like sanding and painting your objects.”
- Closing Encouragement:
- “Keep observing and taking notes on your prints. Understanding these details will help you create even more accurate and functional designs in the future. Great work today!”
Glossary
- Layer Lines: The visible lines on a 3D printed object that show where each new layer of plastic was added.
- Top Layer: The very last layer printed on an object, which can affect its finish and appearance.
- Bottom Layer: The first layer printed that adheres to the print bed, important for the object’s stability.
- Wall Thickness: The measurement of how thick the walls of a printed object are, impacting its strength.
- Artifacts from Supports: Leftover pieces or marks from support structures used during printing.
- Dimensional Accuracy: How closely a printed object matches the size and shape of its digital design.
- DFAM (Design for Additive Manufacturing): Guidelines to design 3D models that print successfully and are functional.
- Extrusion: The process of adding height to a 2D sketch to create a 3D object.
- Precision: The quality of being exact and accurate in measurements and design.
- Pivot Point: The fixed point around which a part rotates or moves.
- Rotational Motion: Movement in which an object rotates around an axis or pivot point.
- Slicing: The process of dividing a 3D model into thin layers so the printer knows how to build it.
- G-code: The set of instructions that tells the 3D printer how to move and build each layer of the model.
For suggestions, improvements, and corrections, feel free to reach out at shayaanhaider@gmail.com