Flex3Drive to Ultimaker Original motor mount slots adapter (inofficial)

**Disclaimer: I am in no way affiliated with Flex3Drive Ltd. or Mutely3D**
(just a random customer)
This is a free public domain model.
No warranties, no guarantees, the usual stuff.

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The Flex3Drive for Ultimaker Oringinal
https://flex3drive.com/flex3drive/f3d-umo/
comes with a motor mount that requires one to drill four holes at some unspecified place.

I wanted to continue using the old motor-mount-slots on the upper left of the back of the Ultimaker. So I made this adapte