Fence Camera Mount Battery Holding Accessories

These accessories work with a QM-1 “Quick Mount” Fence Camera Mount to support an external USB battery for extended runtime. Three designs are provided. These are commonly used for recording Tennis matches.

The first design is the cable tie model which attaches to the pole with four cable ties. Some 3M VHB tape applied between the pole and the mount keeps it from sliding, and four cable ties clamp it to the top section of the pole. This design is simple but it does prevent the top section from fully collapsing for travel. This may make it difficult for the system to fit in a tennis bag due to the extra overall length.

The second design replaces the plastic top block of the QM1 with a printed unit which adds a screw mounting feature  for the battery holder which is attached with two M3x8 button head screws. An aftermarket metal GoPro type mount is screwed to the top with two M3x8 flathead screws, or an adhesive type mount could be used. Four Voron style M3x5x4 brass heatsets are used in the printed top block to accept the screws. This design approach reduces the overall length of the system by several inches to more easily fit into a tennis bag. The original QM1 pole, fence brackets and screws are removed from the factory top block and installed in the 3d printed replacement top block. 

The third Alternate Top Block for QM1 Cam Bracket and Battery Mounting works with the supplied camera mounting bracket and bolt also providing the screw mounting feature for the battery holder. It uses just two of the aforementioned Voron type heatsets. This block also replaces the standard QM1 top block and uses the supplied pole, screws and fence brackets as before. This has the same overall length as the standard QM1 system.

A thread test nut is provided to verify that the printed threads are compatible with your extension pole before committing to print the full top block. We had some difficulty matching the threads of the provided QM1 extension pole, several libraries and other models failed to fit so a custom thread design was made (photo shows some of our testing). Check it first to see if this test nut fits your pole.

The battery pocket is designed for a USB battery 16x67x140mm 37 watt hours Miady AS-TPB21 from Amazon. This compares to about 7 watt hours on a standard battery so a total of about six times the runtime of the camera battery alone should be available. A DJI Action 4 camera is shown in the photos.

The QM-1 is a product from My Tennis Tools. We are not associated with this company, aside from having purchased a unit some years ago.

All components designed in OpenSCAD. 

Print these parts with filament that will hold up to direct sun and heat, we used PETG. Plastic that shrinks (such as ASA) on cooling might have to be adjusted prior to printing to compensate for the threads to fit properly.