That's great, I can imagine how much fun you have with it
I've used the commercial 3D print bureaus, so the design process is a bit different since you don't have to think too much about support material like you do in some cases with the smaller printers.
Back on topic, I can see browser-based programs like Shapesmith becoming a good alternative to downloadable software like Sketchup in the next few years. All the same benefits(and drawbacks, to be fair) as other programs that live in the cloud apply: no need to worry about program updates, installation issues, and so on.
Here's a short writeup about Shapesmith from Fabbaloo.
Tinkercad recently snagged a USD $1M investment, so the interest is definitely there, but for now, Sketchup and this community still makes the most sense for me.