It happens. I don't know what constitutes notable though.
'Ghost guns' showing up in school shootings, experts fear trend will get worse
Four recent shootings involved a gun made from an online kit, police said.
abcnews.go.com
Use of 3D printed guns in German synagogue shooting must act as warning to security services, experts say
‘All you need is a weekend worth of time and $50 for the materials’, Balliet wrote in obscure online post about manufacturing weapons
www.independent.co.uk