I'm only seeing cutters down to 3mm there... do they grind them down to a smaller diameter too? I really need to be carving at 1mm.

The 1mm ball nose bit I got was doing a lovely job - I started slow and gradually stepped up the feed, but when I got too brave and ran it at 40mm per sec it snapped after a few minutes :(

I'm really keen to try something else though and am a bit more confident that I won't break it next time.