You can save yourself some plastic if you know the theory behind the I-Beam and the Real Engineering channel on YouTube explains why I beams are shaped like they are. It explains the second moment of area (sometimes refered to as the moment area of inertia).
The strongest material
Do you have a part that you are thinking about printing, but your are worried about the strength? MatterHackers has done some unscientific comparitive testing for you. You don’t need to be an engineer to understand the test. They printed some parts and tried to break them. Check it out.
link: http://www.matterhackers.com/news/filament-strength-testing
Furniture Arrangement
An engineer has used his 3D printing skills to model his future apartment. He printed the walls, floor and furniture so that he could try on different arrangements on is 1:25 scale model.
3D Modeling in Blender for 3D Printing
If you are familiar with modeling in Blender and are interetsted in 3D printing, then Sculpteo.com has an overview for you. It starts with the 3D Printing add-on, discusses some common mistakes and explains a simple model of a cat
ABS Juice, Glue and Slurry
MatterHackers has an DIY piece on how to mix and use ABS solutions: Use the ABS Juice for better bonding to the print surface, ABS Glue is a better alternative to super glue and hide those seams with ABS Slurry.
Update 4/24/2019 (WARNING): I got a part so stuck to the table that I damaged the coating on my Prusa I3 MK2 table.
Link: http://www.matterhackers.com/news/how-to-make-abs-juice-glue-and-slurry