Police seized a 3D-printed handgun, firearms parts, ammunition and a laptop computer from a home in Downer after the items were found in a shoebox by an occupant on Monday.

Police allege a 24-year-old man, who used to live in the home, used a 3D printer to print the firearm and other firearms parts.

The man was arrested in Gungahlin on Wednesday afternoon and charged with the unauthorised manufacture of firearms, possessing a prohibited firearm, failing to comply with firearms storage requirements and possessing ammunition.

The creation of firearms or firearm parts using 3D printers or any other equipment is illegal.