I read an article in Engineering News Record (ENR June 2021) about a house in Arizona printed with concrete using a 3D printer. The house was done by equipment provided by PERI USA (a German based company) and was done in conjunction with Habitat for Humanity. The printer is made in Germany, so the specifications were listed in metric. For example, “the machine travels freely along thee axes and can travel at up to 1 m per second”. Aggregate sizes were listed as being below 8 mm. Kudos again to ENR as they often will use metric units on articles from Europe or other sources without editing or revision.
Howard Ressel
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