3/23/2023 0 Comments Print to scale sketchupIt will matter however when printing in high resolution materials such as VeroWhite, where the tessellations are something you should be aware of! Issue #3: Scaling When printing in lower resolution FDM, the surfacing issues might not be as apparent and thus might not matter as much. To do so, draw the curve, then type “24s” for 24 segments, or “20s” for 20 segments. In SketchUp, you will need to change the number of segments on a surface before any extruding or push/pull. The cylinder on the left has 12 segments, while that on the right has 24. Going back to SketchUp, we can see how these cylinders were designed: Change the number of segments on the curved surface to better approximate the contours. Solution: In SketchUp, if you select then check, you can see the approximation occurring for the curve. These two files are combined just for side-by-side comparison!) (Note that for actual printing, make sure to separate the parts into different files. The cylinder on the right is much smoother. The cylinder on the left has some tessellation, so during print the surface might not appear as smooth. Let’s compare two designs side by side in netfabb: While a contour may appear smooth in the CAD, depending on approximation settings, the surface might actually be approximated. And even if the surfaces appear closed and you are still having issues, go back through the design flow to double check! Issue #2: Tessellation The key takeaway here is to make sure all the surfaces are closed. Then follow the steps to repair.įor more detailed instructions, here’s a video that goes through the common watertightness issues and shows you how to fix them: You can also do this automatically in netfabb by clicking on the red plus-sign at the top to extend some ends for you. It’s best to go back to your CAD model and remove any free ends or extend it so that it connects with another free end. Also make sure the edges of each surface are connected-each edge should have 2 adjacent surfaces, no more, no less. Solution: Make sure every surface is enclosed so that the part is “watertight,” meaning the part won’t leak if theoretically filled with water. While they appear in the digital rendering, they can’t actually be printed and would not be present in the physical model. With surface modeling, parts sometimes have walls that are infinitesimally thin. 3 Common Issues + Solutions Issue #1: Zero Wall Thickness In netfabb, you can identify watertightness issues, spot surface tessellation, and apply auto-repair, so this is an excellent tool to help you check your models for any errors. How to Check Your Modelsįirst download netfabb Basic, a free program you can use to quickly verify designs. If you’re using a program like SketchUp that uses surface modeling, it can be tricky to make your 3D model printable, so I’m going to walk you through a few of the most common errors and show you how to fix them. Many of the errors we see stem from how the digital model was created and often the main problems come down to whether the design was modeled using solid bodies or surfaces. However, you get your part back to find out that it’s not printable! You’ve created a seamless design-structurally sound, sufficiently thick, and mindful of overhangs.
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