Well, I just wasted over an hour downloading and unzipping DesignSpark. When I went to, finally, open the program the first thing I got was a box telling me I had to first establish a new account with them.
I don't want to get involved with a program that requires me to be connected to the internet in order to use it. I spend my time between living on a small island, on a sailboat,o in a travel trailer. Not uncommon for me to go days at a time without internet.
I have no interest in storing my projects on some company's computer. Call it "cloud" or whatever, bottom line is someone else has control of your work, your processes, and your output. Gosh, how dumb is THAT?
Remember, if you're not paying for the product, you ARE the product.
So, while I appreciate the help,DesignSpark is a double fail for my particular use.
I just tried out the latest Sketchup, the 2013 "Make" version. Again, it's crummy. It won't accept any distance finer than a tenth of a mm. So when you input, for example 9.35 mm as measured on a project, it will just change that and tell you it's aprox. 9.3 mm. If you are trying to match that point up with another item that was a distance of, for example, 9.25 mm, it will tell you that it's been changed to aprox. 9.2mm. Well, aprox. 9.3 and aprox 9.2 do not equal the 18.6 that would be the correct distance when adding 9.35 and 8.25. It comes out to be 18.5 instead of 18.6 and a tenth of a mm IS something that sketchup recognizes, and you now have a gap in your model where two lines don't intersect. Do that a few hundred times and try to print it.
While rounding up numbers is probably okay if you're just printing keychains, it's really a bad practice to get into when you're actually designing something that has to fit something else in the real world.