I’ve built lots of single axis, dual actuator “elevators” for industrial robotics. My gues is that the “table” has 4 contacts, v rollers or linear slides. Each leg likely has a 110v linear actuator. By using a self supporting acme screw, safety is redundant so you don’t need an additional ratchet and pawl type system. But I think when you look at the loads involved, and the strokes you’ll find that for 2 motors, drives, lead screws, rails, bearings, limit switches and the rest, $3k is hard to beat for a well done system of the size and load capacity shown. Sacrificing reliability or smoothness could get you cheaper (there are a lot of ways to lift and hold a pallet). But to copy the design shown I don’t think you’re going to come out to far ahead. None of these are necessarily reasons not to build it, but I don’t think cost savings are going to be significant.
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