One of several tealights I designed while I was at College and then worked on bit more as I do like candles and experimenting with new materials which is why I even casted them in concrete and resin. I aimed to make them simple and minimalist to fit in a modern environment why being practical having grooves for wax overspill and hole on the bottom for easy extraction of tealights themselves.
They can be used without "base pads" but it depends on where you want to put them and what will you print it in. In general, I use them without it and only make pads from if I'm giving them to someone either laser cut them or cut them with a scalpel from cork or print them from TPU.