Marble machine 6mm

thingiverse

This is a revised edition of the motorized spiral marble machine (https://www.thingiverse.com/thing:987441). The machine utilizes 6mm ball bearings or 6mm airsoft bb. The slide and primary gear were merely scaled down to 70%. All other components were redesigned to perfectly fit the 6mm size. A custom motor holder was created, enabling users to adjust the small gear distance from the main gear. This machine can be paired with an n20 geared motor like this (https://www.sigmanortec.ro/Motor-DC-mini-angrenaje-metal-N20-p125711198). RPM is not a critical factor; I successfully used it with both 50RPM and 500RPM settings. To prevent marbles from jumping off the track, smooth out the slide surface at the top, where marbles reach their highest speed and encounter sharp corners. A 2AA battery holder with a switch (https://www.sigmanortec.ro/Suport-2-baterii-AA-cu-capac-si-intrerupator-p126400264) and two rechargeable NiMh AA batteries can be used to power the machine.