Someone was using a Post-It note to remind them to not lock their keys in the office. The designers at TPM Technologies came up with a 3D printed part that looks a little nicer than the dog-eared, barely-hanging-on note. The unit fits snuggly around the door knob cap. 3D printing is bringing all kinds of new applications to products of all kinds. You can see the projects list over at TPM Technologies by clicking here. One fascinating story in 2013 for 3D printing is Robohand. The Robohand is an open source prosthetic developed using 3D printing technology. Makers from all over the world are donating their capability to help people that need fingers. You can visit the site where they have a blog and see what is happening.