Why can’t we just 3d print human-sized legos and build working structures/vehicles with them?

Question

What would go wrong with upscaling legos?

In: Engineering

Answer 1

In some ways you can. I’ve seen precast concrete pieces that work in a similar way to connect to each other, but with grout or some sort of sealant in the joint as well to hold everything in place and prevent water from getting in the cracks.