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You can reuse the leftover, the only waste is what you rinse off which is minimum. You can dump it back in the bottle or just leave it in the bath, as long as you keep the UV protection box over it.
The resin in the states is $40 for 1kg. The software keeps track of how much each miniature costs. A small warhammer size mini is like $0.40, the large KDM pillars I posts a few posts back were $3 ish in material.
It’s hard to think about when you don’t have one but it’s fairly simple. Photo resin cures with UV light. The vat with liquid in it has a clear plastic bottom. There is a screen under that emits UV light and cures the liquid in a certain shape. It’s sticky and once cures it sticks to both the build plate and the clear plastic. The build plate is stickier than the clear film, so the bed raises up once that layer is cured and takes the cured piece up with it, unsticking it from the plastic bottom. It then lowers itself back down (but minus the height of the layer on it) and repeats the process, layer after layer.
If you ever have parts or layers that do not stick to the build plate or previous layer, it stays on the bottom film. That’s when you have a failed print. Your print will be missing the parts that got stuck, and you’ll have cured plastic on the bottom film you need to peel off before your print again. Your printer doesn’t know that so you need you lightly scrape your bath before each print if not starting fresh. You can leave your bath for days at a time as long as you have it covered with the UV protected box that’s on the printer all the time.
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