It's heavy and stable but cheap (low material cost), fast and easy to print. Uses original foot as ballast for weight (look @ picture)
You need two long M3 screws to hold the weight/foot in place (also works without ballast but it's less stable). When you print in 0.3mm layer height, screws fit good enough so that you don't need any additional nuts.
It's optimized for printing in 0,3mm layer height and without supports!
Easily customizable with Microsoft 3D Builder (look at the heart version for example!)
I've uploaded the original files for Sketch-Up aswell, if you want to modify it seriously ;)