A custom made grip that after many iterations finaly feels right. The camera satisfyingly clicks into the printed grip and has little wiggle even without a connecting bolt. You can keep your camera strap connected and easily change batteries and cards. Also a locking bracket or pin is able to connect the main camera body directly to the handle for added strength.
The side handle may need a little sanding to get a good fit, otherwise it might be hard to remove.
I printed this on a zortrax m200 at 40% infill using ABS, with 0.29mm layer height.