I'm thinking to DIY a ND filter using cokin resin filters (cut to size) and using 3D printer to print a holder and attach to the front of the camera. Would like to know what's the maximum weight the gimbal can hold or can I put a counterweight at the back of the camera to reduce stress to the motor.

I'm thinking to DIY a ND filter using cokin resin filters (cut to size) and using 3D printer to print a holder and attach to the front of the camera. Would like to know what's the maximum weight the gimbal can hold or can I put a counterweight at the back of the camera to reduce stress to the motor.