Optical Runout Sensor for Micro Swiss Direct Drive (Ender 3/Pro)

[Update Feb 28, 2022]
#IMPORTANT NOTICE:
New download link : https://www.prusaprinters.org/prints/117031-optical-runout-sensor-for-micro-swiss-direct-drive

Since the user experience on thingiverse.com decreased constantly and new obstacles were setup in the last few weeks (e.g. imposing wait prompts for each single download, deprecated batch downloads, requirement to disable ad-blocker, slow performance, etc.), I decided to move all my prints over to prusaprinters.org where such issues do not exist. That means further, I won't update my print here any more and update and new print will be available on prusaprinters.org. I'll leave my account here active for reference.
Please consider to join me on prusaprinters.org and leave a "Like" if you love my prints.
Thank you for your attention!

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I was looking around for a runout sensor since I upgraded my Ender 3 Pro with a Micro Swiss Direct Drive and found the design by Sulfu, which is quite smart.

It utilizes an optical sensor and is compatible with transparent filament by implementing the reliable and simple shutter mechanism, which is magnetically levitated. Further it is rather small and lightweight. A fantastic design!

I remixed it and added a flexible square mount that snaps around the extruder stepper. Further, I adjusted a few tolerances and made some esthetical adjustments, so that it fits better my overall design.The small ball bearing is held in place by a 3mm printed shaft.

I put my personal logo on the front, but the stl I provide has no logo in case you want it without or design something yourself.

Components:
1 x optical sensor
4 x magnets 3mm (diameter) x2mm
1 x ball bearing MR63
2 x screws M3 x 8mm
ca. 6cm PTFE tube 4mm in diameter