Translate an isometric sketch into accurate CAD geometry. Create and manage multiple bodies inside one Fusion design. Use any appropriate modeling method while maintaining exact 20 mm unit geometry.
Materials
For the online work: a browser and your engineering notebook. Follow the activity’s materials list for any physical build, and get teacher approval before using equipment.
Plan your time
Suggested work block: 45–60 minutes. Physical builds and projects may span several classes; follow your teacher’s schedule.
Lesson Overview
What You Are Learning
Learning Targets
Translate an isometric sketch into accurate CAD geometry.
Create and manage multiple bodies inside one Fusion design.
Use any appropriate modeling method while maintaining exact 20 mm unit geometry.
Verify an assembled multi-body model using Fusion measurement tools.
Modeling Freedom
You may use any Fusion modeling method you already know. The grade is based on the accuracy and organization of the final model, not on using one required feature sequence.
BuildSeparate BodiesColorAssembleVerify
Puzzle Cube Challenge
Project Requirements
These requirements apply throughout Lessons 2.10–2.13.
Finished Cube
3 × 3 × 3 Unit Cube
27 total unit cubes.
Each unit cube is exactly 20 mm × 20 mm × 20 mm.
The assembled puzzle must be 60 mm × 60 mm × 60 mm.
The final puzzle contains exactly 5 pieces.
Piece Geometry
Five Connected Pieces
Each piece contains at least 3 unit cubes.
Every piece must be one continuous solid with cubes connected face-to-face.
At least 1 of the 5 pieces must span at least 2 unit cubes in X, Y, and Z.
Pieces may repeat the same shape.
Color & Printing
Plan for Manufacturing
Use five different colors consistently in the sketch, Fusion model, and final printed puzzle.
Each piece must have a practical flat-face orientation that can print without support material.
No additional clearance is required; use the exact 20 mm unit geometry.
Assignment
Model the Puzzle Cube in Fusion
Use your approved Lesson 2.10 sketches to build the five puzzle pieces. All five pieces must remain as separate bodies inside one Fusion design file.
Step-by-Step Instructions
Create and name the design: Start one new Fusion design and save it immediately using the required filename.
Use a 20 mm unit: Every small cube in the design must measure exactly 20 mm × 20 mm × 20 mm. Build from sketches, extrusions, patterns, combined cube features, or another method you understand.
Model Piece A: Reproduce the first piece from your sketch. Keep it as its own body and rename the body Piece A.
Model Pieces B–E: Repeat the process until the Browser contains exactly five puzzle-piece bodies. Do not Join the five final pieces into one body.
Match the sketch colors: Apply a different appearance color to each body. Use the same color assignment from Lesson 2.10.
Check each piece: Confirm every piece contains at least three unit cubes and remains one continuous face-connected solid.
Check the 3D-piece rule: Verify that at least one piece spans at least 40 mm in X, Y, and Z, corresponding to at least two unit cubes in every dimension.
Assemble the cube: Position the five bodies so they form one complete 3 × 3 × 3 cube with no missing unit spaces and no overlapping bodies.
Verify the finished size: Use Inspect/Measure to confirm the assembled cube is exactly 60 mm × 60 mm × 60 mm.
Verify all 27 units: Compare the finished CAD model with your sketches and confirm the five pieces collectively represent exactly 27 unit cubes.
Prepare for Lesson 2.12: Save the model with all five bodies assembled in the final cube position. Do not combine the bodies.
Before You Submit
The Browser shows exactly five named puzzle-piece bodies.
Each unit cube is exactly 20 mm.
The five bodies assemble into a 60 mm × 60 mm × 60 mm cube.
No gaps or overlapping bodies are present.
Each body matches its Lesson 2.10 sketch and color.
All geometry requirements are satisfied.
Submission
What You Will Submit
Fusion archive: one design containing five separate bodies, exported as LastName_FirstName_2_11_PuzzleCube.f3d.
Assembled model screenshot: color-coded isometric view of the completed 60 mm cube with the Browser visible. Save as LastName_FirstName_2_11_Assembled.png.
Important: Keep all five bodies separate. You will use this same design in Lesson 2.12 to create the technical drawing and exploded view.
Grading
20-Point Lesson Rubric
Criteria
Points
Five separate, named bodies accurately match the approved Lesson 2.10 sketches
5
20 mm unit geometry, 27 total units, and 60 mm assembled cube are accurate
5
All piece rules are satisfied: minimum 3 cubes, face-connected geometry, and 3D-span requirement
4
Five bodies are assembled correctly and use consistent color coding
3
Fusion file is organized, editable, and free of unnecessary or conflicting geometry
3
Total
20
LockwoodSTEM Tutorial
Lesson Video
IED 2.11 — Puzzle Cube CAD Modeling Tutorial
Use this video to review the Fusion modeling workflow for building, organizing, and verifying your five-piece puzzle cube.
Check calculations, units, labels, and measurements against the activity requirements.
Record what actually happened, including unexpected results.
Explain what you changed and why; attach required drawings, photos, CAD, or code in your classroom assignment.
Fusion archive: one design containing five separate bodies, exported as LastName_FirstName_2_11_PuzzleCube.f3d. Assembled model screenshot: color-coded isometric view of the completed 60 mm cube with the Browser visible. Save as LastName_FirstName_2_11_Assembled.png. Important: Keep all five bodies separate. You will use this same design in Lesson 2.12 to create the technical drawing and exploded view.
A PDF download is not a submission. Review it, then upload it and any required attachments through your classroom assignment system.
