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Step 1: 3D-print the case

Time to complete: 10-30 minutes for print setup, plus about 2 hours of print time.

For this project, we'll print the housing (or case) out of PLA plastic. The garage typically stock 10-15 different colors of this material, so you can pick a style that compliments or contrasts with the other parts of the project. Begin by downloading the case 3D model and loading it into your preferred slicing software:

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Step 2: laser-cut the plate

Time to complete: 10-45 minutes for setup and cutting.

This design uses an acrylic plate to hold the electrical components inside the case. We'll cut it out of 1/16" (1.59 mm) cast acrylic sheet.

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Step 3: Soldering and assembly

Time to complete: 20 minutes to 1 hour, depending on your soldering experience.

At this point, you should have a case and an acrylic plate. Let's get it all assembled! First, press the switches through their matching holes in the acrylic plate. The holes are square, so you'll need to get each switch in the correct orientation.

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Step 4: Programming the board

Time to complete: 15-30 minutes.

Connect a USB type-C cable to the MCU. Then. press and hold the small Boot button on the board, while simultaneously plugging in the other end of the USB cable to your computer.

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