While we don't yet have a dedicated case for the MFB Tanzbar, one of the cases in our UNISON line may be a good fit!
The dimensions we have on hand for the MFB Tanzbar are: (13 x 6.69 x 2.36) inches. If that aligns with what you have, we would recommend looking at the UNISON Case for the Elektron Octatrack: (13.4 x 7.3 x 3.5) inches.