PLA, stainless steal and the nightmare it has caused me (3 replies)

This may not look like much, but it took me over a year, countless drill bits, and copious amounts of cutting fluid to produce a completely polished, 2mm ID in a stainless steel M6 rod for better PLA extrusion. I found the secret is a #48 parabolic flute drill bit, from both ends followed by a 2mm straight flute drill bit, kind of like a reaming bit, all the way through to get rid of the parting line. Then, a .094" spiral wire brush coated with wet Ajax in to polish it. This ought to get you PLA loving ecohippies off my back.