I mostly use my printers to build these. 3d printed nerf blasters. most of these files are on thingiverse. except the pistol. You'll have to buy the stl files for that one.
Tempest - New 3D printed blaster release : r/Nerf
FTEC1 Gen1 Blaster Custom 3D Printed Parts kit – Foam Technician
A-180 Sci-fi Blaster 3D Printed Replica - Etsy UK
Worker Esper 3D-Printed Blaster Kit B - Blaster-Time
Starling 3d Printed Blaster by pocnic | Download free STL model | Printables.com
Full-Auto 3D-Printed Brushless Nerf Blaster Arduino Control - Hackster.io
3D Printed Star Wars: Han Solo's DL-44 Blaster - YouTube
Mandalorian Blaster 3d Printed - Etsy UK
Star Wars 101 Blasters Collection – 3Demon - 3D print models download
3d printed Rival blaster, work in progress. Shooting video in comments : r/Nerf