There are many ways to increase the printable size in XYZ axis.
1.Rising the gantry by remove the bottom tie bar;
2. Unscrew 4 screws of gantry and then re-fix the gantry with 2 screws. As a result, gantry and its Y-axis stepped motor will be risen by 32mm (Say 30 mm);
4. Recalibrate the X-axis carriage and its printer head to level and parallel to the heat bed by adjust two homing screws and 4 levelling screws for heat bed with a sheet of paper.
5. Use Marlin to compile and update firmware to printer for the change in Z-limit from 206 to 231 (i.e. from 205 to 230 mm.)