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Thanks Dan, that makes perfect sense. I bought the UCB, just haven't gotten around to building it.. it did inspire the 4x4 carrier :)

Thanks everyone for your input!

I was trying to decide on whether I would add three more blocks in length, as the whole thing felt pretty heavy and was concerned about the x drive wear.

The...

I made a sled that was about 12 inches longer than my project side rails. Incase I need to modify the design I wanted some flexibility.

The sensor measures the width just fine, but when the...