![]() ![]() When two parts are designed keeping very little clearance between them it is called Press fit. It must be kept in mind that the tongue must not be too thick sinceit has to bend for the joint to go together. This can be in the form of a ramp in the geometry which will force the tongue backward as you try to pull on the jointor it can through an access point that lets you release the tongue manually. If you wishto keep your snap fitting re-openable then please make sure that you provide a way for the tongue using which it can disengage from the capture. In cases where the snap fittings are printed in the Z direction which is perpendicular to the platform it will lead to the break off. It is always advisable to position snap fittings so they print horizontal to the 3D printer’s build platform. You must keep in mind to include a clearance of between 0.2mm and 0.5mm which will depend on how tight you want the joint to be. Make sure thatyou leave enough space for the tongue so that it can bend backward as it slides into place. Then you have to create a matching capture point on the opposing part. You have to create the tongue with the Line and Push/Pull tools. If your part is not just a visual model then it is advisable to use other methods for attachment. Under stress or pressure the glue joints in plastic will tend to break, even when it comes to its response to change in temperature. Using Glue in SketchUpĮven though glue is the most common way by using which one thing can stick to another thing but it is also one of the weakest and unreliable method. The more you do design in SketchUp for 3D printing the more you will understand about these details. For example, a spinning shaft will require more clearance than a simple snap fitting. ![]() The amount of space you keep for the clearance depends on the kind of movement that is required. A small amount of space needs to be added which is called clearance which will allow the two parts to slide past one another. Due to the friction that is present on the surface of the peg and that of the hole the peg will not be able to fit in the hole. Even though in SketchUp it was possible its real life that is not possible. In real life if you try to fit a 10mm peg in a 10mm hole then you will notice how the peg won’t go into the hole. To help the parts slide past one another extra space is required which is known as the clearance. This helps you to be aware of the difference you are dealing with. The manufacturer of the 3D printer provides a number for the machine’s tolerance to consider as a plus or minus value which is usually around 0.005mm. Even though this difference is very small, around a few tenths of a millimeter more or less, it might be a problem if you intend to use the printed part to connect with parts that are already present in real life. ![]() In case you decide to 3D print a 10mm cube you drew in SketchUp, the printed version will not have the exact 10mm measurements. The difference in measurement between your part in SketchUp and the measurement of the part printed by your 3D printer is called tolerance. Prior to understanding the mechanical connections, it is important to understand two of the realities that often crop up when you decide to move out of the idealized SketchUp environment- one is tolerance, and the other is clearance. Given below are the ways using which youcan join the parts of the models you have already made using SketchUp: Tolerance and clearance in SketchUp ![]()
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