Nút bịt container (plug) có tùy chọn khe cho filament

I don't know what to put here — it's a plug with two options: one that just blocks everything off, and one with a slot for filament, letting it stick out a little so you don't accidentally drop it and have the filament spin like a Beyblade. I'd suggest TPU, but feel free to use whatever you like. I reckon brass plug would look pretty, but it likely wouldn't work all that well :)

Filament should not move if plugged in, if it does there be some issues.