For my first time, on a tight schedule I picked up some plastic burlap mesh from michaels because it was local, and twist tied it to the wine racks .. it did the job - but very awkwardly and it wasn't pretty at all, even in pink.
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www.michaels.com
Would love to do perforated stainless sheet steel, but proper shelves would be twice what the cooler cost, before even getting into whether it allows enough ventilation.
After some experimentation I found some cheap stainless mesh that is thin enough for good airflow
and some molding to frame it
Back ClarityGlass Like (Clear with No Distortion, High Gloss)Custom AdhesiveWe can apply adhesive to this Aluminum Cap Moulding. Please request a quote by using the button above.Custom Cutting InformationAll custom cutting options are available. Please see our Product Cutting Options, posted...
www.outwater.com
In my mind, I was thinking I could use those slide on plastic report binders, which would have been even cheaper, but I couldn't find any longer than 10" and I didn't want to deal with trying to splice them. Took me awhile and a lot of searching but ended up on the molding above. Not dirt cheap, but still able to keep the shelf under $20ea. Something could probably be 3d printed but I don't have a printer
Also required a miter box for the corners and a good diagonal cutter to size the mesh
End result has plenty of airflow and is more flexy than desired, but sturdy enough that it's not going to collapse