explain_eduverse_ on Instagram: "This creator spent months building a fully working mechanical marble clock using only 3D printed parts. . . What looked simple at first turned into a serious challenge as tracks jammed, lifts failed, and entire sections needed reprinting and hand finishing to fix timing issues. After many revisions, the lift system and gravity circuit finally worked as planned. . . He is now focused on the marble selector, the most complex part of the build, aiming to complete th