I think that there should be an option to print without a base being printed first.
Actually there is: when at the build plate (in the Polar Cloud), go to the PRINT SETTINGS. Make sure that under PRINT SETTINGS, the "Basic" tab is selected. Then, at the very bottom, change the "Platform Adhesion Type" to "None (Skirt)". You will then get a print without a raft.
Indeed, that's the default for the Polar3D 2.0 printers. I don't recall offhand the default for the 1.0 printers.