# Gear Ratios Subject Area: Technology, Engineering, Math Learning Objectives: Students will be able to create a drivetrain and calculate the gear ratio. Materials Needed: One computer, one Micro or Micro+ 3D printer, and one 250ft PLA 3D Ink filament spool per 2-5 students. Brief Description: Students will print a platform, a crank, and a variety of gears. The gears are each labeled with their diameter. The Students can create a unique drivetrain and calculate the gear ratio. 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 250ft spool of PLA 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\. Students will go online to: and download the gear ratio models.\ 2\. Students will open the M3D Software on a computer, upload the models, and print: 2 of each of the 4 gear sizes, 8 pegs, a crank, and the gear box board. \ 3\. Once the models have printed, students should create a drivetrain by putting the gears onto the gear box. \ 4\. After they have their drivetrain, students should measure the RPM of the last gear, the torque of the system, and the gear ratio. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://education.printm3d.com/lesson-plans/3-5/gear-ratios.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.