That tiny microcontroller sitting bare on your desk deserves better than a tangle of exposed pins. A maker known as Eric just shared a clean, no-frills case for the Adafruit QT PY ESP32-C3, and it is one of the most satisfying first prints you can make: fast, useful, and forgiving.
The QT PY ESP32-C3 is one of Adafruit's smallest wireless boards, and it shows up in everything from tucked-away sensors to permanent STEMMA QT gadgets. Because it is so small, a printed enclosure keeps it protected without adding bulk. This particular design skips button cutouts on purpose and instead adds wire passthrough openings, so cables can run in and out cleanly for a project you plan to leave running for a long time.
What makes an enclosure like this a great learning print is that it teaches you two skills at once: printing parts that need to fit together, and printing parts that have to fit around real hardware. There is even an optional solid lid variant if you would rather seal the board away completely instead of leaving the top open. It is a small object with a lot of practical payoff.
To make one yourself, download the STL files, drop them into your slicer, and print in PLA at a normal 0.2 mm layer height. Orient the box with its open side facing down so the walls print cleanly without supports, and do a quick test fit before gluing or clipping anything. If the board sits too tight or too loose, adjust your slicer horizontal expansion by a tenth of a millimeter and reprint. That single setting is the secret to enclosures that click together perfectly.
Ready to give it a go? Load up your printer, pick your filament, and turn a bare board into a finished little device. If you are still choosing a machine, filament, or the right nozzle for detailed functional prints, browse the gear and guides at Flarelab to get set up for your next build.
Frequently asked questions
Do I need support material to print an electronics case?
Usually no. Most enclosures like this one are designed to print flat with the open side down, so overhangs stay shallow. Slice it first and check the preview, and if you only see supports under a lid lip you can often skip them and clean up later.
What filament should I use for a project box?
PLA is perfect for indoor electronics enclosures because it is easy to print and dimensionally accurate. If the case will sit near heat or live outdoors, step up to PETG, which handles warmth and sunlight far better.
How do I make sure the board actually fits?
Print a quick test of just the base or one corner before committing to the whole box. If the board is tight, bump your slicer horizontal expansion down by 0.1 mm; if it rattles, nudge it up. Small tweaks solve almost every fit problem.
Can I print this on a small or entry-level printer?
Yes. The QT PY is a tiny form factor board, so the case fits comfortably on any bed, including compact printers. It is an ideal first functional print because it is fast, uses little filament, and gives you a useful result.
Inspired by a community project shared via Adafruit's #3DThursday, featuring a design by Eric on Printables. Rewritten and expanded by Flarelab. View the original post.
