You mean for the rows/columns? I think I choose capital letters because most board I saw online had capital letters.
Correct. The proper notation is 1.e4, not 1.E4. Some boards may use uppercase, probably for legibility. Some people probably don't care or the manufacturer doesn't know. I see alot of marketing photos with dark square in the bottom right too so I assume manufacturer doesn't know (not a CAD error like yours ) I think the boards are very fun and the storage is a great idea.
Ok good to know, I'll keep it in mind for future projects
Game notation uses lowercase letters, but board notation tends to use capital letters, as can also be seen in the images of the two Polish boards shared between our posts. The electronic boards made by Millenium also use uppercase letters on each square. So there is nothing particularly troubling about using uppercase letters on a board.
Here is a nice set with lower case letters.
I know there are such sets too. It's just that I came across more sets that use uppercase letters - just look on this page: it includes 4 sets (I'm not counting the 2 homemade ones) with uppercase letters and they weren't even posted for this reason. That's why I said that "board notation tends to use capital letters". I personally own at least 4 sets with uppercase letters, probably more.
Let's leave at a point of preference.
On one side of the manufacture and on the other side the buyer.
But if anyone ever wants a board of mine in lower case, you can just contact me for it 
It's not a big change to do.
You mean for the rows/columns? I think I choose capital letters because most board I saw online had capital letters.
Correct. The proper notation is 1.e4, not 1.E4. Some boards may use uppercase, probably for legibility. Some people probably don't care or the manufacturer doesn't know. I see alot of marketing photos with dark square in the bottom right too so I assume manufacturer doesn't know (not a CAD error like yours ) I think the boards are very fun and the storage is a great idea.
Ok good to know, I'll keep it in mind for future projects
Game notation uses lowercase letters, but board notation tends to use capital letters, as can also be seen in the images of the two Polish boards shared between our posts. The electronic boards made by Millenium also use uppercase letters on each square. So there is nothing particularly troubling about using uppercase letters on a board.
Here is a nice set with lower case letters.
I know there are such sets too. It's just that I came across more sets that use uppercase letters - just look on this page: it includes 4 sets (I'm not counting the 2 homemade ones) with uppercase letters and they weren't even posted for this reason. That's why I said that "board notation tends to use capital letters". I personally own at least 4 sets with uppercase letters, probably more.