Spray can trigger handle
Pressing an aerosol nozzle for long paint sessions cramps your finger and gives uneven coverage. A trigger handle clips around the top rim of a standard 65 mm spray can and converts a squeeze of the whole hand into a smooth nozzle press. The body has a 66 mm ring 12 mm tall with a snap gap, a 100 mm pistol grip and a pivoting trigger on a 4 mm pin that pushes a pad onto the nozzle. Print the grip upright in PETG and the trigger on its side for pin strength.
Can rims vary by a millimetre or two between brands, and SpeakCAD adapts the ring to the cans you actually use. Ask for a wider trigger pad or a finger guard and see the change immediately. Trying the design in the browser is free.
Design a spray can trigger handle for a 65 mm can: a 66 mm inner ring 12 mm tall with a 6 mm snap gap, a 100 x 30 x 25 mm pistol grip with finger grooves, and a hinged trigger on a 4 mm pin pressing the nozzle.