I'd still like a candle mould the shape of the original household candle.
I've been avoiding this discussion as I've been a candle and lantern addict since childhood. I tend to avoid anything which may flare up my condition. But it's the best time of year for light and hard to avoid it, so here goes.
I have made silicone moulds of various candles which are hard to get hold of, including the classic Prices household candle. And Christmas tree candles, yes I do real candles on my Christmas tree.... And various obscure lengths and diameters to suit my lantern collection which runs from 18th century lanthorns to 1930s mass produced tinplate offerings. I also make candle lanterns in tinplate and brass, I enjoy making replicas of my historic examples. Mostly basic sheet metalwork but satisfying!
Silicone candle moulds are easy to make, but I usually incorporate a pouring funnel into the mould which I fill to the brim with each pour, like the runner in metal casting. This results in a large blob on the end of the candle. Easy to cut off and chuck in to the next melt. The advantage is that on cooling the hollowing occurs in the funnel and not in the candle. If the mould is simply the shape of the finished candle the hollowing can often end up running half the way doen the candle. You can top up, but the resulting candle is often unstable as it burns.
Silicone moulds are easy to make from a candle you want to replicate, or if you don't have an example, getting creative with suitable tube or pipe.