A 19-year-old Nagoya university student who has been arrested for alleged production of explosives and a 3D printed gun was served a fresh arrest warrant Thursday over stimulant drug possession, police said.The male student has told investigators that he produced the stimulants himself and the police seized chemicals he is believed to have used to make the drug. His name is being withheld because he is a minor.The police believe he synthesized about 0.6 gram of the stimulants found at his home on Aug. 20 out of curiosity about chemistry rather than for his own use -- the same motive they su…READ FULL ARTICLE