Please tip as all the tips go to a charitable cause!
Just designed this. Might be a bit over engineered, but here we have:
Moss Shelf for Aquariums or Terrariums.
Slots and Holes primarily for flow and dirt to fall through.
Some design details:
Large rectangular slots for flow
Small rectangular slots for thread loops
Side slots (half circle) for thread adhesion as well
Small holes (3mm) next to feet for stacking (as per attached picture)
Print with a raft if need be.
Print in clear/natural PLA at 100% infill
Do not place in marine tanks or areas of flow like filters or sumps as the PLA will degrade faster.