For 3” speaker for driving bluetooh reciever in the photos, you can use 15w stereo amphi and suitable power supply i made it in that way and it works well you can take stronger sound than it size
i made my cover from wood plank you can for better performance but if you want you can use playwood aswell
ps: i added .par file for if you want to edit design, i used solidedge st10 for making this in metric form
Print Settings
Printer Brand:
Ultimaker
Printer:
Ultimaker 3
Rafts:
Doesn’t Matter
Supports:
Yes
Infill:
30
Credits:
acarugur