explaining on Instagram: "He set out thinking it would be a fun 3D-printing project — but what looked simple on paper turned into a months-long engineering battle. This creator tried to build a fully mechanical marble clock made entirely from 3D-printed parts — with no electronics, just gravity, gears, and precision timing. As he dove in, tiny design flaws quickly became huge headaches. Tracks kept jamming, lift mechanisms kept failing, and entire sections had to be reprinted and hand-finished j

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