While we don't yet have a dedicated case for the Arturia Microbrute SE, one of the cases in our PULSE line may be a good fit!
The dimensions we have on hand for the Arturia Microbrute SE are: (12.8 x 8.7 x 2.36) inches. If that aligns with what you have, we would recommend looking at the PULSE Case for the Elektron Octatrack: (14 x 9 x 2.5) Inches.