I'm one of those who cannot stretch sprue consistently, plus I'm wary of the fumes associated with that.
I also endorse brass wire. It comes nice and straight. It doesn't rust like steel wire and it's easy to cut and bend. There's also all kinds of tubing available, including many sizes that nest well and are useful for things like masts and stacks.
Another way to make short rods is to buy a decent quality nylon house painting brush. I've got one that has bristles about 3" long. They are a mixture of black and clear. They are mostly not too round and they have tapered tips, but the brush probably has about 10,000 of them.
If I snip off a couple dozen at a time, I can sort through them and get some good round pieces an inch or longer.
They aren't strong, but make great whip antennas and short pieces of rigging like stack stays.
i cut brass wire wiith snips, and I cut tubing with a tubing cutter. Depending on the tension you put on the cutter, the cut can sometimes have a slightly rounded or "squished" end. That can be dressed with a file, or sometimes used to advantage. A trick when cutting tubing that you intend to nest, is to nest it first and the cut the larger diameter over the smaller one. Otherwise they may not slide together because of the slightly squished end on the bigger piece.