3D Printed Parts

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 using PLA filament. Original design source may be downloaded using the links below.

Build Volume

The parts require a 3D printer with a minimum build volume.

• 66mm (X) x 66mm (Y) x 35mm (Z)

CAD Assembly

The QT Py RP2040 press fits into the built-in holder on the bottom cover. The case snap fits over the bottom cover. The NeoPixel LED strip fits into the top channel on the case. The STEMMA QT rotary encoder is secured to the built-in standoffs on the bottom cover. The knob press fits onto the shaft of the rotary encoder.

Multi-Color Knob

The knob is printed in multiple colors using the change filament technique. In CURA slicer, open the post processing plugin window by going to the top file menu:

Extensions > Post Processing > Modify GCode

Click, Add a script and choose Filament Change.

Enter 5 in the layer input box for the first change. Then, add another filament change and enter 15 in the layer input box.

Filament Swap

Use a dark colored filament for the first six layers. When layer 6 finishes, the printer will pause to allow the filament to be swapped.

Use a white or clear colored filament for layers 6 through 15. When the printer pauses the second time, change the filament back to the dark colored filament.

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 boards, displays, connectors and more can be downloaded from the Adafruit CAD parts GitHub Repo.