Ultimaker Original Vibration Damping Foot
Discrete feet to fit an Ultimaker Original. Insert a piece of rubber for damping (you may need to change the original SW file to make it fit). Also, remember to mirror two feet when printing.
I'm still working on the right calibration for my Ultimaker, so the prints on the photos aren't perfect. You can probably do better yourself ;)
If you make one, please share the picture!