This protective case for a Neo Trinkey features a built in USB shell to help stabilize the board.

The print-in-place button allow you to access the reset button. 

Translucent filament helps to soften and diffuse the NeoPixel LEDs .

The large ring allows you to use bigger keychains or lanyards!

Capacitive Touch 


The Neo Trinkey case is also compatible with these optional 3d printed conductive touch pads using Conductive PLA filament. These allow you to route the touch pads to the top of the case, in addition to the back and front. 

Keyboard Inputs


The touch pads can be used as keyboard buttons! You can set the two touchpads to be an HID (Human Interface Device), like a shutter button on mobile devices or a macro pad on a computer!


All of the 3D Printed case parts snap fit together and print with minimal supports.


Close-up of NeoTrinkey PCB inserted into a laptop. The LEDs emit rainbow colors.
It's half USB Key, half Adafruit's Neo Trinkey, the circuit board with a Trinket M0 heart and  four RGB NeoPixels for customizable...
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Parts List


STL files for 3D printing are oriented to print "as-is" on FDM style machines. Original design source may be downloaded using the links below.

  • trinkey-case.stl
  • trinkey-cover.stl
  • trinkey-pad.stl

Slicing Parts

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


  • Support Extrusion Width: .2
  • Support Density: 4%
  • Support Z Height: .21
  • Interface: Off
  • Support Roof: On
  • Support Pattern: Zig Zag
  • Support Roof Pattern: Zig Zag



Slide the Neo Trinkey into the bottom slot inside the case.

Align the touch pads to the edge of the case.

Press fit the cover tab into the slot on the PCB and align the cover to the edges on the case. 

Cap Touch Pads


Use conductive PLA filament for the capacitive touch pads. The optional cap touch pad are fitted over the PCB. Arrange the right and left pads to fit on the PCB.

This guide was first published on May 25, 2021. It was last updated on Mar 08, 2024.