Accessory grip maker Richard Franiec has created a custom grip for the Panasonic Lumix DMC-GM1. The grip is made from anodized aluminium alloy and should improve handling when using the GM1 with larger Micro Four Thirds lens. It weighs about 20g and leaves the battery/card door and tripod socket unobstructed. As usual, the grip attaches to the camera using high-strength 3M double-sided tape, but can be removed if necessary. It should be available later this month and cost $34.95 plus shipping.  

Franiec has also made similar custom grips for many popular cameras including the Sony Cyber-shot RX100, Nikon 1 V1, Canon Powershot S100 and Olympus PEN E-PL3/E-PM1. They're generally well-regarded by customers, and we've like the ones that we've tried.