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jaguarking11
This is what I used for my printer. You don't have to be 100% acurate on the rod lengths, however you do have to be very accurate to match the rods to each other as close as possible. I have roughly .1-.2mm difference in mine, its as close as I could get. I am also using solid alu drilled and tapped. I recommend CF tubes instead. Not as expensive as you think. If you need some pointers, my printer is a one of, and it is printing properly as of last night. Check out my blog in my sign it may help you on your adventures.
I forgot to put the link. Sorry, thinkyhead is what I was going to post as well. Awesome calculator.