Once We Were Stardust

Who printed the gun isn't an interesting mystery. Whether they also printed the assassin, however...

The technology to print any resource saved the future. Their material needs met, jobs are optional, and life is peaceful.
Until that peace is threatened by a series of shootings in a city where guns are illegal – by a killer who might have recycled themselves afterwards. To detective, Ceri, they offer more mystery than most crimes – and excuse her lack of diplomacy with idiots.
Distraction from the mundanity of life is less attractive as the danger grows, and by the time she realises the victims were killed because of what they might know, Ceri knows too much.
Can she outwit the assassin on her tail, and uncover a secret at the heart of printer technology?