These printed great. With a pause in the middle to switch colors these look wonderful. I added some felt pads on the bottom so they don't slide as much on the table.
Rostock MAX v2
Looks nice! One suggestion, though: if a wall is a certain thinness, the extruder will leave a gap in the middle of it, which I'm seeing in these prints. This is because the printer knows that with its nozzle diameter (usually around 0.4mm), it can't fit a third line in between the two sides of the wall: there's not enough space to fit a third 0.4mm line.
To fix this, and fill in the walls, you might try telling your printer that its nozzle size is just a bit smaller than it actually is, encouraging it to fill in those walls because "hey, you can fit now!"
And you may need to alter your extrusion rate if you change the nozzle diameter setting.