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Why marble runs are the coolest 3D prints

In this video, I share one of my favorite 3D printed gifts/toys - marble runs. I typically don't 3D print a lot of toys, but ...
Hackaday

3D Printed Marble Music Machine Looking Good Already

Inspired by the enormous marble music machines from the staggeringly talented [Wintergatan] and the marble run builds by [Daniel de Bruin], [Ivan Miranda] has been busy again building a largely 3D ...
GIGAZINE

Create an incredibly complex marble run 'Marble Fountain' with a 3D printer, where balls roll endlessly

Morrison's Marble Fountain is below. Morrison says the prototype for Marble Fountain was completed quickly. The process for creating Marble Fountain is very simple: first, randomly place points. Then, ...