> For the complete documentation index, see [llms.txt](https://education.printm3d.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://education.printm3d.com/lesson-plans/9-12/stiffness.md).

# Stiffness

Subject Area: Engineering

Learning Objectives: Students will learn about the stiffness of different types of materials. 

Materials Needed: One computer, one Micro or Micro+ 3D printer, at least three spools of 3D Ink in different materials and weights per 2-5 students. 

Brief Description: Students will print out test models in different materials and measure their stiffness. 

To Prepare: Students will need a computer that has the M3D software on it. We recommend one printer per every 2-5 students. The Micro or Micro+ 3D printer will need to be plugged into both the wall and the computer. Each printer will need to have a spool of 3D Ink feeding into the external port. A spool holder is also recommended. 

If you need assistance with any of the above please see our guides at support.printm3d.com. 

Lesson Plan: 

1\. Divide students into small groups. \
2\. Students will go online to <https://support.printm3d.com/145216-3D-Models> and download the stiffness test models. \
3\. Each group should print one stiffness model in at least three different types of materials. \
4\. Once they have their models printed, students should clamp the flat end to a surface, and then add weights to the other end. \
5\. Students should measure how much weight it takes to move the model 1mm, 2mm, & 3mm.&#x20;