Use whatever material you want. My prints are from Ender 3v2 with 0.4 nozzle.
- 2 perimeters
- layer height 0.28
- without supports

UPDATE: I made some changes - now the honeycomb grid is part of the model in the stl files. No need to set anything via modifiers! The older version is now in its own folder called Solid bottom (OLD VERSION).

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OLD VERSION print instructions:

• If you want a honeycomb bottom, you need to set the infill 15% with the honeycomb pattern with top and bottom solid layers set to 0.
• For tray 4xsmall you need to set the modifier of the top platform where you add at least 1 bottom and 1 top solid layer!