Extra mount plate for the typical Shark battery mount for better fitting on 35mm diameter frame (like Salsa Fargo or such).
There are three different models. Complete mount with controller box. Only mount. Only controller box.
See pic below of all pieces (I had to split them because of printer bed limitations). On top is the original mount for the Shark battery.
Original thought was to use the original mounts base, with the new mount and controller box bottom part. But the print turned out bad so I used only mount myself.
Print instructions: Well, for a FDM printer. I don't know, split it in two pieces and print with support I guess. Personally I printed with a SLS printer and the pieces was very warped but still good for use.

Additional material needed: Two M5 screws, two tie straps. You also need to drill a hole in controller box if you use the original one like I did. See pic. You could also use some self adhesive tape to secure the mount even better.
Actually I also drilled two holes and used two small wooden screws in the front of the plate to secure it even better for rough riding. And some helicopter tape on the frame as well.

I have also a model for the Jumbo Shark battery and mount. No mount plate yet though. Will come later.
https://www.printables.com/model/1272761-ebike-battery-with-holder
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The author marked this model as their own original creation.