Download the files for this case using the buttons below. If downloading from the zip file, note that the models inside the STL_files folder and 3MF_files folder are the same. There is also a .f3z file included in case you wanted to modify or adjust parameters on the model itself.

The case is made up of 3 pieces:

  • case
  • cover - snap fits onto the case.
  • switch extender - fits on top of the onboard switch so it can be reachable from outside the case.

Print out all three, using 0.2mm layers and no supports. Choose your favorite color PLA filament.

The case has a "shelf" that the board sits on so that it doesn't crush the battery. It also has a pair of slots that you can thread some velcro through to secure it to an armband or a bike pedal arm.

Cut about 17cm length of velcro, and reduce the strip width to around 11mm. Thread it through the slots before placing the board inside as shown below.

Depending on where you will mount it, you can also opt to add a rubber or silicone piece under the case, to add a bit more stability. The clear silicone piece shown here was from a local dollar store, but a couple of the more common small circular rubber feet might just do the trick as well.

Attach the battery to the BLE sensor board, and align the USB-C port to the biggest hole on the case. Push the board down so that it is sitting on the shelf. The battery wire will stick out a little. Then, place the switch extender on top of the board switch, you should feel the switch slot into the hole. 

Finally, align the switch extender to the switch port on the cover, and snap fit into place. Voila! You should still have access to the right-angle button and the STEMMA QT connector.

This guide was first published on Feb 14, 2022. It was last updated on Jul 21, 2024.

This page (3D printing and assembly) was last updated on Mar 08, 2024.

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