FarmBot comes with rail mounting brackets that are intended to be secured horizontally. I wanted to have a decorative trim to the top of my raised garden bed which prevented me from using the stock mounting plates. Its also really important that the farmbot tracks are parallel which is why the design also has pill cus outs for the surface mounting screws. This allows the track distance a fine tune adjustment. These brackets can be used for any T-Slot linear rail.
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