I have design and printed a 3 gear laydown box to my RB6
No new holes are needed in the chassie. And you can have the LIPO across or along the chassie.
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I printed the motor plate in SLS aswell, just to testr fit before i order one i aluminium.
On my prototype its only feasible to fit a 68 tooth spurgear but it is corrected in the CAD models.
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I printed a batteryholder i SLS aswell, but its designed for 2mm carbon fiber.
It has a movable stop depending on how you want the battery.
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I have not had the time to test it on the track yet. But the gears feels smooth in the box.
If there is an interest its available on
Shapeways