For this one I created a model that would trick the slicer into using internal ribs along the length, and it has stayed in tune. I have made two - one as a 2.5kg body and one as a 3kg body (prefer the lighter one). It has a lot of sustain - 25-30 seconds on open E using La Bella low-tension flats, compared to 15 seconds for our Fender Player JB with stock strings. This can be build for about $120.
Printables
Printables