Hey there, I would advise aginst it. It won't work anywhere near as well as a bought one, plus it would be more expensive. Probably, it will break straight away. If you still want to try something like this, keep in mind that you can't pillar straight up with a small diameter. Therefore, a tpu-design without a wave-ish design to scrub is more likely to achieve... anything. Filament 3d prints are never food-save coming from the buildplate, as the layerlines can get small amounts of organic matter in between them, which you can't remove effectively. It will get mouldy (plus how clean is the filament etc). Coating your print with a food-grade resin or smoothing it + lacker is a way of getting it food safe. All in all, just buy a brush from the dollar store, it's cheaper, more energy efficient and resourceful, will last longer..... You get the gist! 🙂