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Definitely don't blow through the coolant tubes to make sure they're not blocked! I did this and contracted a really nasty stomach bug. I can't remember what it was, but my wife's a GP and said they...

I was thinking of things like Delrin, acrylic, nylon. There are a few different engineering plastics that might fit the bill. I didn't really specify one as I don't know your other criteria like...

Of course.

Check the whole machine over carefully. There could well be far worse things than that needing attention. Mine had the HT lead to the laser (20kV) flapping around against the metal...

Mine arrived too. Thanks.