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Using self tapping screws is quick, cheap and requires minimal design efforts. This is a great technique for a quick and dirty prototype. Fasteners – using hardware with your 3D printed parts But when you do need to scale a model with connecting parts, it will require you to readjust your tolerances. It is always best to model your parts at the right scale. Try to avoid printing your snaps in the Z direction (built up from the print bed vertically), they are much weaker than parts printed in the x/y direction. Building up snaps in the Z-layer has the least amount of strength To avoid wasting time and material, print only the parts you are trying to test instead of the entire model.ģ. It’s good to test your connections to find the right tolerance. This clearance can vary anywhere from 0.1mm – 0.3mm depending on the printer resolution, material, speed, and more. Usually when fitting two parts together and printing on a desktop FDM printer, the male and female parts of the joint must have a certain clearance between to account for material tolerance. Tips for designing snapping and fitted joints: Once the piece is through the hole, pressure is released and the ball expands again to hold the piece in place.
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When the component is being inserted, this gap allows the two halves to deflect and squeeze together. One component uses a protruding annular ball joint. Hinges - Snap fit pivots - A good way to print a hinged pivot point. One piece is more flexible than the other – in this case when you’re using the same material, that means one piece is thinner and therefore more flexible. As the hook passes the edge of the hole, the cantilever beam returns to its original shape.Īnnular snap joints – Great for circular applications – Classic examples of ASJs include ballpoint pens with snap-on caps, and the child-resistant cap on Tylenol bottles. They have such a precise tolerance that pieces can snap and come apart with no problems.Ĭantilever Snap joints – are the most common – Typically, a semi-flexible cantilevering hook is deflected slightly as it is inserted into a hole or past a latch plate. Press-Fit Assembly – Using the friction between two components to hold something in place. Sliding Fit Assembly – Applying traditional woodworking joinery to 3D printed parts.