FreeShuriken 3.5 inches
Thingiverse
7 model
Free
FreeGrille adapter for Golf 3 door speakers 6.5 inches (16.5 cm)
Printables
FreeAcoustic Panel Wall Spacer - 3 Inches
Printables
FreeElegoo Jupiter/Saturn air evacuation funnel 75/100mm (3/4 inches)
Thingiverse
FreeCase for Raspberry pi 4/5 - Hoysond 5 inches touch display / optional camera rev 1.3
Thingiverse
Free3 Inch Speaker Cover
Printables
FreeHivi M3N tuned bookshelf speakers
Printables