HAL-e doesn’t always go in perfectly straight lines. She’s still usable, but we’d like to improve her further. We’ve started another prototype, using paper caps on the wheel and new sensors. Aesthetically, it’s definitely going to be much less nice looking than the original design, thanks to the wires sticking out.
Additionally, the construction might be out of reach for elementary schoolers given the extra wires. I’ll keep on working on it, but I doubt that having HAL-e move in a perfectly straight line will be worth the trade-offs.