Lazy Susan BBBearing (Open Center)
thingiverse
You can pivot around empty space by creating a bearing with an empty center. Simply choose how large you want the hole in the middle to be - it could be similar in size to ball bearings or smaller. You also have the option of selecting the size of bolts you want to use for assembly. This particular design is meant to be bolted together, and all the details are taken care of once you've selected your preferences. The STL provided features a 20mm center hole, M3 bolts, and .177 caliber BBs as the bearings by default.
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