Rotary Sprinklers by Supermange
If you’re using Google Sketchup for designing 3D printable models, you may have noticed that exporting to STL’s using some of the various plugins can be very hit-or-miss. After checking out Supermange’s rotary sprinklers I was reminded of this quick fix for a very common design problem in Google Sketchup – the “flipped face.”
Looking at the screenshot above, you’ll notice that the facets of the object are either a white-and-light-gray tone or a dark-gray-and-darker-gray tone. As a surface modeler, Google Sketchup doesn’t much pay much attention to whether a surface is on the outside or inside of a model. However, once you turn it into an STL, this can create problems.
Fortunately, this is an easy problem to fix. All you need to do is right click on the darker face (such as much of the top right flange of the model above) and select “Reverse face” from the menu. While you can select multiple faces at once and flip all of them simultaneously, this still leaves a minor, and somewhat tedious, problem of detecting the flipped faces in the first place. If they are too numerous or tiny to locate, you might be better off using some STL correction software to fix the flipped faces.