Here’s a description of my printer (and others): Real User 3d printer reviews - #11 by Cotty
The water tank geometry can be printed without problems without any support structure (it’s often amazing how well overhangs can be printed by such printers, if you don’t overdo it).
Generally, you export an STL file from SketchUp, then use a slicer program to convert it to G-code, which is the format used by most printers.