I created this so I could stack 12in vinyls with an airgap to dry after cleaning with my spincleaner.  It should fit any standard 12in, though I have only tested it on a few.  I suspect it should stack at least half a dozen high, but you'd maybe want to widen it to go higher than 10.  The records in the photo are pre-wash I promise.

Printed with PLA+.  I'm sure would work with any filament but may need to tweak tolerances for stacking.

Created in Fusion 360.