This is a simple snap-fit case for the Original Khadas Toneboard. The top part inserts into the bottom part via ridges and holds down the board using the rivet guides that insert into the pegs holding the PCB.
 

Print Settings:

• 5-10% infill 
• no support needed
• you can use brim to avoid warping if you print with PETG, ABS or similar
• uses around 15g of filament for each part 
• since the board gets pretty warm at times in my experience, I suggest printing it with heat-resistant filament

This is my first design so if you print it let me know if you like it!