By default cylinders are drawn with their principal axis measured along the z coordinate. The bushing was very easy to make because the piece is made of two cylinders. The photograph shows one of these on the left. I decided to 3D print bushings to fit in the slot. It was an elegant solution, but unfortunately no such screws were on hand when it was time to add another drive. The hard drives in an old computer were mounted with custom-made screws that had a head which slid in slots. Let's look at a simple illustrative example. It is possible to export a 3D model built with OpenSCAD to many different formats including STL which "slicer" programs such as Ultimaker Cura can transform in G-Code which can be viewed as the machine language of 3D printers. A 3D model is a script describing the object which is then "compiled" to render the object. All these operations are implemented as functions ( union, difference, scale, translate and rotate). The basic geometric shapes, or any combination of their union or their difference no matter how complex, can be scaled, translated and rotated as in vector drawing programs such as Inkscape. It is also possible to subtract a shape from another. The geometric shapes are joined in an additive process to build up a 3D object. spheres, polyhedrons which will not be used here.cylinderswhich can be modified to produce cones,.cubes although technically they are rectangular cuboids,.Objects in OpenSCAD are created from elementary solid geometric shapes: It looks this will be the case for my 3D models. I also know that it is possible to really mess up when "improving" a program. From long experience, I know that it will always be possible to improve any program that I write. Invariably, there is no single, obviously correct, way of proceeding. Furthermore, and no matter how that goal is defined, there are many, many ways to achieve it. Something that is "fit for purpose" must be attained, but just what that means is rather nebulous. I felt at ease with that particular open source CAD program which can be described as the conflation of high school geometry and a C-like scripting language.Ĭreating 3D models resembles writing programs. The generated image on the right shows what I came up with using OpenSCAD. The objects were relatively small so it would not take too long to print, which is not negligible when starting out printing 3D objects and anticipating many problems. The design looked simple enough since it’s basically just three slabs of plastic arranged in a triangle. Two three-dimensional A's with curly hooks at the end seemed like a reasonable tablet stand. After printing a few objects created by others with my new 3D printer (see First 3D Prints with an ANYCUBIC Mega Zero), I wanted to try my hand at creating a practical 3D object.
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