Perfectly clear ice spheres are nifty but can be a bit tricky to make without an apparatus ... and in this case we get to see 3d printing, sand casting, lost PLA casting, lathe turning, milling ...

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From there, a sand casting mold is built around the pattern using sodium silicate in a 3-4% mix by weight with fine masonry sand. Once ready, the pattern is removed, and the mold is assembled ...