I-beam made from PLA with 3D belt printer.[1] Can be looked at.

I-beam made from steel with rolling mill.[2] Can hold up large building.

[1] https://www.youtube.com/watch?v=PQ-h-ErqrEg

[2] https://www.youtube.com/watch?v=MfaqrVFnQBQ

Well, that is going at the problem from the wrong direction - you should use a 3D printer not to print everything, rather to print tools and fittings to manufacture what you need from local resources.

In this case for example a saw making tool & make the beam from local wood using 3D printed gauges.

	▲	t098i3 20 hours ago \| parent [-]
		Wood you harvest and cut yourself is not going to match an I beam on strength, you need engineered wood for that, which involves adhesives and composites. Not to mention, lots of places on earth don't have local wood suitable for construction...

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lstodd a day ago | parent | prev [-]

yup. haha.

imagine 3d-printing a TEU. Or a container hauler.