3 – 3D Printed Plastic Enclosure

To be honest: Planning, designing and printing the enclosure took some evenings. And then a few more… and nights…. and days and then evenings again.

I’ve never designed anything as complex as the Marta housing in CAD. The enclosure is not even that elaborate but the level of difficulty was perfect for me. All components had to fit inside the housing in a space consuming way. Actually, the design process influenced the choice of electronic components and vice versa.

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3.1 – Main Body and PCB Holder

I totally forgot the holes for the general purpose aviation plug connectors.

The main body is by far the largest 3D printed part. It’s essentially an octagon with walls. These walls have some cavities for the speakers as well as for the four arcade buttons. The same applies to the bottom side of the enclosure where we have holes for screws, buttons and lights.

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3.3 – RFID Reader Holder and Top Plate

The main user interface is a simple small orange plate.

It’s not the buttons but the RFID reader that makes the device special in terms of user interaction.

In the top plate’s center there is a little orange piece of plastic holding the RFID reader’s antenna. The thickness is reduced where the antenna operates so that tags may be detected reliably. Magnets arranged in the corner of the antenna will hold the tags in position. Magnets with a diameter of 8mm will fit in perfectly. The number of magnets can be changed without printing a new part as they are held by screws.

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