Mission Prototype Build

Overview

Grade Levels: 6-8
Duration: 120 minutes
Class Size: 25 students
Unit: Secret Agent STEM Mission (Lesson 11 of 20)
Topic: Printing and assembling 3D gadgets using Strawbees and troubleshooting design challenges
Standards Alignment: Next Generation Science Standards (NGSS)

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Learning Objectives

By the end of this lesson, students will be able to:

• Develop and refine a 3D prototype based on their prior designs.
• Use 3D printing technology to create components of their gadget.
• Collaboratively assemble their prototypes using Strawbees and additional materials.
• Apply troubleshooting strategies to resolve issues encountered in 3D printing and assembly processes.
• Communicate their design challenges and solutions effectively with peers.

NGSS Performance Expectations:

• MS-ETS1-2: Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem.
• MS-ETS1-3: Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.

Crosscutting Concepts:

• Influence of engineering, technology, and science on society and the natural world.
• Structure and function (how components fit and work together in design).

Science and Engineering Practices:

• Developing and using models
• Constructing explanations and designing solutions
• Engaging in argument from evidence
• Obtaining, evaluating, and communicating information

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Materials Needed

• Student 3D model files (from previous lessons)
• Access to 3D printers (recommend 2-3 machines for workflow efficiency)
• Strawbees kits (connectors and straws)
• Supplemental materials (tape, scissors, rubber bands, markers, cardboard, glue)
• Troubleshooting checklist handout (common 3D printing errors and solutions)
• Laptops/tablets for monitoring print progress and note-taking
• Stopwatch or timer (for timed assembly sessions)
• Projector or whiteboard for teacher instructions and group reflection

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Lesson Procedure

1. Introduction & Objectives (10 minutes)

• Begin with a brief recap of the "Secret Agent STEM Mission" progress so far. Emphasize how today’s focus is to transform their digital 3D designs into physical prototypes.
• Share lesson objectives clearly on the board.
• Show a short, engaging video or animation (teacher-led) demonstrating the relationship between digital modeling and physical assembly, highlighting troubleshooting possibilities.
• Establish expectations for collaboration, tool handling, and safety near the 3D printers.

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2. 3D Printing Preparation & Start (20 minutes)

• Students pair up in groups of 2 (12 groups total, one trio if needed). Each group will bring their 3D design file to the teacher or designated print manager for review.
• Teacher models how to prepare printer beds and load files using the slicing software. Discuss print settings relevant for their gadget parts (layer height, infill, support materials).
• While 3D prints start, students fill out a "print log" (time started, expected duration, material used) to build habits of tracking engineering processes.

Teacher Note: Monitor 3D printers closely for immediate troubleshooting. Encourage student inquiry if issues arise.

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3. Assembly Station Setup & Introduction (10 minutes)

• While printing progresses, allow students to visit the assembly station stocked with Strawbees and supplemental materials.
• Teacher demonstrates building basic geometric frameworks using Strawbees to create structural parts of a gadget.
• Highlight the importance of precision and adaptability in structure, linking it to their printed parts.

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4. Prototype Assembly & Troubleshooting (50 minutes)

• As prints finish, groups take turns retrieving their parts and begin assembling their gadgets using Strawbees and printed components.
• Encourage iterative testing: if parts do not fit or prints have defects, identify issues and brainstorm fixes (e.g., sanding down supports, adjusting assembly order, reinforcing with Strawbees).
• Teacher circulates actively, prompting metacognitive reflection: “What caused the print to fail?” “How can you redesign or adjust?” “What lessons will you apply next time?”
• Integrate peer-to-peer feedback—groups visit another team's assembly station for constructive critique.
• Use troubleshooting checklists collectively to guide problem-solving and documentation.

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5. Group Reflection & Sharing (20 minutes)

• Gather students for a structured reflection session:
  • Each group states one success and one challenge from the printing or assembly process.
  • Discuss troubleshooting strategies that worked best.
  • Highlight the engineering practice of iteration and problem-solving.
• Create a shared “Troubleshooting Wall” on the classroom board or chart paper to record common issues and solutions discovered during the lesson.

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6. Wrap-Up & Homework (10 minutes)

• Summarize how prototyping is a crucial stage in engineering design that requires flexibility and creativity.
• Preview the next lesson: Improving and testing the gadget’s performance.
• Assign a short reflective prompt: “Explain one thing you learned about 3D printing or assembly today and how you think it will help your design improve.”

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Assessment

Formative Assessment

• Observation of student collaboration and troubleshooting during printing and assembly phases.
• Completion and accuracy of the print log sheet documenting key printing info.
• Quality and completeness of assembly relative to design goals.
• Participation in peer feedback and reflection discussion.

Summative Assessment

• Exit ticket writing prompt on lessons learned about iteration and problem-solving during this session.
• Teacher evaluation rubric focused on:
  • Understanding and use of 3D printing technology
  • Ability to assemble and modify prototype structures
  • Application of troubleshooting strategies
  • Communication and teamwork skills

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Differentiation Strategies

• Provide step-by-step visual guides and simplified checklists for students needing additional support.
• Offer advanced students opportunities to modify print settings for better outcomes and experiment with design variations.
• Use peer mentors for students requiring help in assembly or troubleshooting tasks.
• Allow alternative assembly methods for students with fine motor challenges (e.g., larger straws or pre-cut pieces).

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Extensions and Enrichment

• Challenge students to design and print an additional gadget component that enhances functionality (mini sensor casing, handle, or mount).
• Introduce basic coding for printer settings customization or control if technology permits.
• Include a mini-competition where teams showcase their assembled gadgets and explain iterations made for problem-solving.

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Teacher Reflection Prompts

• How effectively did students engage with the iterative design process?
• Which troubleshooting challenges were most common, and what resources helped overcome them?
• How did collaboration influence students’ design success?
• How can future lessons integrate improved support for 3D printing technology?

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This detailed plan integrates NGSS-aligned engineering and technology practices that build critical STEM skills and foster creativity and perseverance among middle school students. It leverages hands-on learning and peer collaboration to make the prototype-building mission both immersive and educational.