Yep, you have to be very careful when printing with aluminium powder.

An unfortunate example: "Two Workers Killed and Two Injured in Explosion at 3D Printer Plant" https://dustsafetyscience.com/dust-collector-explosion-shang...

If you so much as LOOK at Titanium funny you may have a really, really fun time.

Some powders have been known to burn inside the collection receptacles for excess powder while a print is running.