QT Py Case

3D print yourself a snap fit case to house a QT Py and a STEMMA QT breakout board. The bottom cover has built-in holder for the QT Py that can be secured without any screws!

Modular Design

The top cover has several vents that can be used as mounting holes so you can secure the board in different orientations.

The bottom cover features similar slots so you can mount it to either the top or bottom.

QT Accessories

The case features two mounting tabs for attaching to surfaces. Just snap fit the covers over the framing with the opening lined up for the USB-C Port.


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CAD Parts List

STL files for 3D printing are oriented to print "as-is" on FDM style machines. Parts are designed to 3D print without any support material. Original design source may be downloaded using the links below:

  • QTPy-Case-Top
  • QTPy-Case-Bottom
  • QTPy-Case-Frame

Slicing Parts

No supports are required. Slice with setting for PLA material. 

The parts were sliced using CURA using the slice settings below.

  • PLA filament 220c extruder
  • 0.2 layer height
  • 10% gyroid infill
  • 60mm/s print speed
  • 60c heated bed

CAD Assembly

The QT Py is press fitted into the bottom cover. A Stemma QT breakout is mounted to the top or bottom cover using M2.5 hardware. The case frame is fitted over the top and bottom covers and snap fit together.

Design Source Files

The project assembly was designed in Fusion 360. This can be downloaded in different formats like STEP, STL and more. Electronic components like Adafruit's board, displays, connectors and more can be downloaded from the Adafruit CAD parts GitHub Repo.

This guide was first published on Jan 11, 2022. It was last updated on May 03, 2024.