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This is a Futaba 3UCP Field Force 3 Radio Control Transmitter Battery Cover.
The 3UCP transmitter is a 2-stick 3-channel computerized FM/PCM radio control system with 6 model memory manufactured by Futaba of Japan in the early 1990's. Long out of production and rare, finding an original spare battery cover is impossible. This cover was made in Blender using an original 3UCP cover for initial measurements. It has been successfully 3D printed and revised to improve fit and finish. It snaps into place just like the original battery cover.
Please note: This battery cover is unique to the 3UCP transmitter and does not fit any other Futaba transmitter model.