While we don't yet have a dedicated case for the Maschine Controller Mk1, one of the cases in our UNISON line may be a good fit!
The dimensions we have on hand for the Maschine Controller Mk1 are: 12.6 x 11.6 x 2.6 . If that aligns with what you have, we would recommend looking at the UNISON Custom Edition: Compact: (15.1 x 13.7) x 4.7) inches.