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This seems to be the "big meccano" everyone uses, just bought a couple of lengths to play with https://www.mcmaster.com/t-slotted-framing/t-slotted-framing-rails/
This seems to be the "big meccano" everyone uses, just bought a couple of lengths to play with https://www.mcmaster.com/t-slotted-framing/t-slotted-framing-rails/