How to print a voxel object?
Magicavoxel supports export as .obj, natively or with the right plugin.

While .stl is the standard for 3d-printing exchanges, as it contains a "1-unit" length,(typically that corresponds to 1 mm), .obj is also accepted by most slicers.

To get to MagicaVoxel's native export, look in the lower right corner, click export and see this pop up:



Press the top-left OBJ option and you get a save position window where you can store it. Then open it with your slicer and choose a scale - most .obj files do not contain a scale as the format does not contain a unit measure by default like .stl and has to be given one.