I just got a 2nd hand RX1 and developing a "bond" with the camera. I think it has some of the best usability after some configuration (I especially love the AF/MF switch which sadly my other Canon/Contax combo can't replicate).
Anyway, I love the form factor of RX1 and don't want to add extra dimension via a leather case or all-around grip. I saw this 3D print extra grip but have no idea how good quality it is in real life. Anyone tried it before?
Try addin a thumb grip as well. Often times the simple act of adding a thumb grip can make all the difference in the world. When I had the x100, it wasn't comfortable at all to hold but adding a thumb grip changed all that.