DIY Spray Paint Pump from Disinfectant Sprayer - Free STL

Turn a cheap disinfectant sprayer into a fully functional spray paint pump for under $1! This DIY project uses a 370 dual-head air pump and a 3D-printed housing (PETG recommended; PLA may soften with heat). Perfect for makers, hobbyists, and anyone looking to upcycle old sprayers into a budget-friendly spray painting tool.

How It Works:Check out the full build guide on my YouTube video: https://youtu.be/t4KN7turQJU It covers assembly, newbie tips, and fixes for issues like paint bottle spills.

Tips:

Verify pump dimensions before printing.Feel free to remix the STL for your setup!Got ideas to improve this design? Drop a comment here or on the YouTube video! If you like this project, please give it a like and check out my channel for more DIY builds. Happy printing and painting!

What’s Included:

STL file for the pump housingAlternative housing STL without the switchDesigned to fit a 370 dual-head air pump (~$1 online)You may need a Chinese name for online shopping370 雙頭氣泵Assembly Notes:

Use five M3x8 screws for assembly and one M3 screw to secure the neck.Soft rubber tube: 7mm outer diameter, 4mm inner diameter.Optional: KCD1 switch and JST connector for easy assembly.Add a 104 ceramic capacitor for motor durability.