You can print it all using some FLEX/TPU filament at 0.2 but I did a version using FLEX for base and PET for the buttons. Doing a extruder change on layer at 1.00 mm and with 0.1 layers.
If the base is too thick you can feel too hard to press the buttons so maybe you will require to reduce it's Z from 0.3 to 0.2
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