Designing in SketchUp to Avoid Support Material for 3D Printing
Think about your parts orientation.
Orient the part so that it prints with the smallest number of overhangs. This may mean printing your object upside down or on its side. The capital T could be printed standing upright, but laying it on its back allows it to print much faster — without support material.
Try rethinking your angle.
Most printers can print a slope between 45 and 60 degrees from vertical without using support material. Keep this limit in mind as you design. Chamfers and fillets are great for supporting features and smoothing out rough transitions. Here, a chamfer turns a part with an unsupported overhang into an easily printable part. As an added bonus, fillets and chamfers make your part stronger by eliminating stress points.
Consider breaking your object into multiple prints.
The sphere could be printed using support material, but it will print faster and with less cleanup if you split it in half and attach it back together afterwards.