I'm an avid Sketch-up user (printing primarily with the Replicator 2) but I've been super impressed by www.tinkercad.com lately. It's browser based (WebGL) but

I'm an avid Sketch-up user (printing primarily with the Replicator 2) but I've been super impressed by www.tinkercad.com lately. It's browser based (WebGL) but surprisingly powerful.