I usually debur with the edge of a bit of HSS, or If I want agoo finish, a small file.

I thought I'd treat myself to a set of four proper deburrers (aluminium, brass/CI, steel, plastic). despite being small and incredibly cheap (4.10 for four with plastic handles from Arc Euro). The handles are abit naff, but actually have a clever twist lock and you can reoplace the inserts which are even cheaper.

What I hadn't appreciated is that each tool has a different geometry and swivels to cut at a suitable angle without digging in to the softer materials. In use, its a bit like peeling a potato. only you get a very neat, consistent very narrow bevel on the corner. You can also trim back any slight raised edge, as on where a bandsaw cut was made.

For such a simple item, i wish I had these years ago, they are also ideal for tidying up plastic kits, for example.

Neil