Nuki smart lock modification part for APECS thumb knob cylinder

Note/Update 2: I do not use this Nuki lock anymore and I don't recommend it. I replaced it with an Aqara U200 lock, which is better in every way. It supports Apple Home Keys, it's faster and stronger, and it has many more features and opening options. The Nuki also has terrible battery life, and its USB-C charging implementation on the battery pack is horribly broken.

I designed a new model for the APECS cylinder knob for the Aqara U200 here: https://www.printables.com/model/968599-aqara-u200-smart-lock-modification-part-for-apecs.

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Note/Update 1: It was brought to my attention that covering up the thumb knob as shown here is problematic because when the lock's snap protection has been triggered, access to the little button on the knob is required to unlock the door, so covering it up is not a good idea for safety reasons. I'm leaving the model here for educational purposes about how to model a replacement part for the Nuki knob for other lock types.

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This part lets you use a Nuki Pro v3 smart lock with an APECS Euro cylinder that has a thumb knob on the inside end. This is not needed if your cylinder has a key hole on the inside end, instead of a thumb knob.

You'll have to disassemble the APECS lock in order to be able to slide it through the opening in the Nuki mounting plate. That disassembly is not trivial.

This was printed with PETG without supports. The two parts are held together by two 2-56 thread machine screws and matching 2-56 square nuts. 

Designed in Fusion 360, the model is available here: https://a360.co/3CnWsBw