This is a keycap with the lambda symbol, and another with a Cthulhu head (derived from the mini Cthulhu by Cymon) for cherry MX keys. Good for Cherry keyboards, or Kinesis, Filco, etc. These are "E" row keys, good for a variety of uses.
This should be printed with 0.1mm layers or thinner, and at REALLY slow speed, like 20mm/s or slower, to get good quality. Then just paint the inside of the lambda symbol.
This keycap was made with solidworks, and is fully parametric, so I'll be posting a full set of keys eventually. They just take a while to render and test print ;)
This is a standard row "E" key, but I'll be adding the other rows as well. Just about any unicode character can be encoded on the face of the key. I'm doing a "poo" symbol ( http://www.fileformat.info/info/unicode/char/1f4a9/index.htm ) next.