I'm experimenting with casting some flaming bocce pallinos* and need some advice on the best way to sprue them up. They're 1.6" hollow spheres with a spindle inside around which I'm going to wrap a kevlar wick. I want advice because there's so much about these that is pushing the edge of what lost foam can do - they're small, with a large surface to volume ratio, and the path for the metal to flow around them is far from direct. A centrifugal casting setup would probably be best, but all I have is a bucket of fine sand. (BTW, they will also be coated with a thin layer of drywall compound.) My current plan is to make sure I have a long sprue to create more hydraulic pressure and to pour hot. Aside from wanting general advice, I have some specific questions: The ideal sprue for lost foam is straight down. But is there a way I could gang these up for a single pour without causing too much of a chance of defects? Regardless of if I gang them together or not, how far apart should they be? In the past, I think I've encountered some defects from hot gas from one pour messing with a nearby foam form in the same sand bucket. I'd prefer to avoid the extra work of setting these up in separate buckets of sand. How well will dry sand flow into them? Should I take the extra step of making some green sand to pack in and around them? I have a gut feeling that this would give the pattern some extra stability, but maybe at the cost of permeability. * A pallino is the little ball that's tossed out first during a game of bocce. Each person / team then alternates turns tossing their balls and trying to get them as close as possible to the pallino, or maybe to knock their competitors' balls away from it. I'm thinking it would be kinda fun for the pallino to be on fire, thus the hollow sphere with a wick on the inside. Thanks!