NUKI Fob Keyholder

This is a keyholder with integrated Nuki Fob.

Warning: For this keyholder you have to disassemble a Nuki Fob - all warranty will be lost! I am not responsible for any damages!
At the moment you will also loose the water protection - keep that in mind!

To get the needed electronics, you have to open your Nuki Fob. Mine was already broken, but I think you can open seperate the top and bottom case when you remove the battery holder (don't blame on me, if this doesn't work - I didn't try that on my own).
Then you have to take the PCB, the battery and the button and put that in the printed "Nuki_Keyholder_Front.stl". Put some M3 screws in screw holes and close the front with "Nuki_Keyholder_Front-Lid.stl".
You may have to sand down the pole in the middle, depending on your key thickness.
Place the keys with "Nuki_Keyholder_Key-Adaptor.stl" (the big ring is intended to be pointing to the back) an the M3 screws.
Last but not least put some M3 square nuts on the back part and screw everything together.

Update: Added .step file with slightly optimized measurements and space for a more commonly available (and higher capacity) CR2032.