Recently, we discovered that the dust collection vacuum unit for our LPKF Protomat C30/S was leaking powdered fibreglass dust all over the under-desk cabinet in which it lives. This of course being unacceptable from a safety perspective (powdered fibreglass is not a carcinogen, but is a major irritant in general) and from a cleanliness perspective, we took it upon ourselves to figure out what went wrong.
It turns out that the machine had been operated for an indeterminate amount of time without pre-filter bags, and the filter had failed under the load of nearly 3mm of caked-up fibreglass and copper dust. D’oh.
So, a quick Google search yielded exactly zero sources for filters (but LPKF will sell you the bags, $35/5).
In true hacker spirit, this did not phase us at all. After all, how hard can it be to build a dust collection system from scratch?