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PRINTING. This should be a pretty simple print. Ideally set line width to 0.5 mm (walls are 1 and 1.5 mm). Preferably use low vertical resolution for faster print. Print the lid in your favorite transparent filament and print upside down. Infill does not matter. No supports needed. I use some cheap epoxy resin for sealing my prints (i.e. making them waterproof, in this case I used it for the trays only).

FILAMENT. Use PLA for biocompatible kits or PETG if you want them to withstand higher temperatures. I use some cheap and easy to print CF PLA for the seed starters and trays, transparent for the lids.