![]() As you’re inputting measurements you will notice changes to the model in the Preview Window. We choose the **Left** arm option and input our **measurements** in the **Parameter window**. Let’s assume we’ll be making a **left** handed device and our measurements are: TAKE NOTE thats the AFFECTED arm you are building a device for not the NON-AFFECTED arm the other measurements are taken from. > The circumference of the AFFECTED upper arm, measured from the middle of the upper arm Shown in the Diagram as **measurement A**. Shown in the Diagram as **measurement B**. ![]() > The length of the NON-AFFECTED forarm as measured from the inside fold of the elbow to the wrist. Shown in the Diagram as **measurement C**. > The length of the NON-AFFECTED hand as measured from the wrist to the end of the longest finger. The instructions show us to measure these 3 areas of the recipient. For this example we’ll be using the (wiki:#). Make sure to follow instructions for the device you’ll be manufacturing as measurements and parameters will be different. OpenSCAD can be intimidating for first time users, however we only need to focus on a few key areas, specifically **Model/Device Parameters**, **Preview Window** and **Shortcuts**. You can download OpenSCAD from their homepage () This allows a few user provided **parameters** (in this case measurements taken from a recipient) to be used to **automatically** and **intelligently scale parts** to match the recipient ready for printing, instead of ***manually*** scaling and adjusting parts using photo references in 3D software. OpenSCAD is a powerful, free and open source modelling tool that allows making adaptable, **parametric** models.
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