My spouse found a pair of wall mounted holders for her eye glasses from some online source (sadly, AFTER I became a 3d printer enthusiast). She needed more but couldn't find the same design. So I printed out another pair (though I printed them at 5 glasses each instead of 6). You can see the comparison in the photo of 4 holders, the purchased ones are on top and mine are on bottom.

I designed this item so you can modify any of the parameters you like but you probably only want to change “num_holders” if you want each printed piece to have more/less than 5 glasses.