sound bar design I did up to make use out of an old pair of pc speakers that no longer worked

I added a picture of the set of speakers i used but you could substitute your own speakers and amplifier board from amazon. there is even plenty of room for a battery inside 

I did not include a back for the cabinet but you can do what i did and use a piece of acrylic or very easily design your own back!  

speaker dimensions 

tweeters(midrange) - 50mm diameter 

Woofer - 100mm diameter 

external DIM: W-300mm X H-120mm X D-100mm

broken down into 2 parts and re-connected using 3d pen.  also has a tong and grove to re-connect 2 parts but if you printer is not 100% accurate you'll probably just want to cut that off and glue together