Design Challenge: Make a 3D printed irregular object with a specific volume.

ASK [30 min] How can we measure the volume of an irregular object with a ruler? Can we use water?

Show students how to use the displacement method to measure volume and have them complete the Worksheet.

Show students how to use the grid or ruler in TinkerCAD to measure the length and width of an object.

IMAGINE/PLAN [20 min] The Instructor reviews the answers from the worksheet to ensure all groups understand volume. Ask students to start sketching an object they want to make in TinkerCAD that has a volume between 10 cm3 and 20 cm3. Ask participants to design an object that combines multiple simple shapes. Think crazy! Have a few teams briefly share.

PROTOTYPE [50 min] Students print objects on a 3D printer. Show students how to export their design from TinkerCad into a slicer program. Suggest appropriate bed adhesion and support materials. **The most important measurement to check is the object’s width, be sure it will fit into the diameter of the graduated cylinder so students can measure the volume in the next step.

REFLECTION [20 – 40 min] As each team gets their 3D printed design back, have them test the volume using a graduated cylinder and water displacement.

Then each group can share successes and obstacles while completing the challenge.

ITERATION [20-40 min] Have students redesign in TinkerCAD and print a more accurate volume.