3D Print and Assemble the Case
To 3D print the case, grab the 3MF file below and load it into a compatible slicer such as Bambu Studio. Or you can grab the individual STL files.
3MF and STL files for 3D printing are oriented to print "as-is" on FDM style machines. Some of the parts are designed to 3D print with tree supports material using PLA filament.
If you'd like to edit the model then grab the STEP file.
3D Print Settings
Print the models in the orientation shown here. I printed at 0.16mm layer height with supports turned on for the base and lid with a threshold angle of 25º. This allows the slicer to support just the internal parts without messing with the angled lid.
You can see the supports here, set to red just for illustration purposes.
Remove the supports with a pair of pliers or ask your pet sloth to gnaw them off for you.
Battery Fit
Temporarily lift off the NeoKey BFF, then plug in the battery as shown. You can wrap some of the excess wire around the JST connector as shown, just make sure the power switch can still be accessed and flipped between positions.
Then re-connect the NeoKey BFF as before.
Case Fit
Press the stack into the base as shown with the USB C port aligned with the case cutout -- it should snap into place.
You can then tuck the wire and battery into their cozy little nook.
Magnets!
The case was designed to use two pairs of 6mm x 3mm magnets to keep it snapped closed. The posts on the opposing corners prevent it from shearing or rotating (these magnets are strongest on one axis), and in truth have tight enough tolerances that you may be able to skip the magnets. But magnets rule, so why would you want to!
Press Fit
Place two magnets in the lid, either north or south up is fine for these two, they don't need to agree with each other, since we'll set the other two magnets on them to set them properly on the base. That said it's good practice to have them aligned the same so we don't accidentally put the base magnets in backwards later.
With the magnets partly seated, press them in by pushing the lid down on your work surface, with even pressure, until they are flush with the lid's flat bottom.
Push Into Base
Now, set the lid over the base making sure the power switch cutout of the lid is on the opposite side of the USB cutout of the base!
Push the lid down evenly and firmly to seat the base magnets. You can either press them down fully or use a set of parallel jaw pliers or pliers wrench as shown below.
Power Switch
Extend the LiPoly BFF power switch using the 3D printed slide.
Align the cutout with the switch actuator as shown.
Keyswitch
With the top lid aligned with the base as shown, snap the keyswitch into the lid so the two legs will fit into the NeoKey BFF sockets.
Close It Up
Set the lid onto the base, being sure the two keyswitch legs are aligned with the BFF. You'll also need to align the power switch actuator with the groove.
Test Power
Check that the power switch actuator can be pressed in to turn on the One Key, and pulled out to turn it off.
If you want, make a few in different colors for different functions!
Page last edited April 15, 2026
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