Hey :)

i designed a little key holder for internal room doors. So the key doesn't fall out of the lock.

It also reduces the noise coming from the other side of the door.

I printed it in TPU 95A.

My keyholes have this size:
widht: 8.5mm
high: 15.5mm

I added a Keyholeholder with a little hole to see if there is light or not on the opposite of the door. And i added a Keyholecloser to close the Keyhole on the opposite of the door. With and without hole.

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TPU or TPE is not easy to print for beginners. Use the right settings in your slicer or use the preconfigured 3mf file ;)

Also very important is:

Release the pressure from the retraction of the filament (bondtech gears)
Increase the nozzle temp if you encounter issues (235C is just perfect)
No retractions!
Print with slow speed! 20-40mm/s
If you have problems with the filament sensor, deactivate it.