Printing Large Objects on 3D Printer without Warping

OK, so yep... the manufacturer recommends no bigger than 10cm cube for a part printed in ABS. Even at that size, you'll often get pretty bad warping. ...unless of course, you design your parts to not warp. Here's how I made some 20cm+ long parts. You don't have to make the holes nearly as big as I did. ....just big enough to break up the layers. I happen to also want to save material by having bigger holes. So... there ya go.