EDIT 7-24-2016
So I've gotten a lot of emails over the last two years from people who suffer from hand tremors or know close friends/family that do and would like to see updates for this design. I have news... sorta, in an engineering course I worked with a group of several students to improve this design and make it manufacturable. the improved design is more stable from a physics standpoint but doesn't use any 3D printed parts. I am working to adapt the design to a printable form factor and publish it online for all to use.

So these were created for a science fair project I did with the objective to try to develop several different types of drinking cups for people with parkinsons or suffer from a severe intention tremor.

My grandfather, who has a severe intention tremor, burned himself trying to drink coffee one day and thats what inspired me to create these cups.

I only had my printer for a month before the fair, so I did not get to develop these as much as I had hoped to. In a later version there may be a better handle, better fluid containment, less of a pressure difference upon pivot, increased degrees of freedom.

Heres the catch, If I hear that any one of you makermen and women think that this is a great idea, and say so in the comments, then I will complete my designs for these cups more proactively.

In the fluid series I have developed a unique mug that is intended to use a non-newtonian (shear-thinning) to simulate a slosh tank (what they use to counter earthquake vibrations in tall buildings) within a large outer apparatus. As a result the inner cup pivots in the opposite direction to counter the effect of some minor translational and rotational oscillations due to hand tremors.

My axis series: http://www.thingiverse.com/thing:277956