From the course: Designing a Replacement Part using 3D printing

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Design rules: Planning for thread width

Design rules: Planning for thread width - Tinkercad Tutorial

From the course: Designing a Replacement Part using 3D printing

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Design rules: Planning for thread width

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Let's examine ways to fix the gaps that we've found in the sleeve of our knob. Thread width or a single extrusion of plastic is the building block of our 3D print. The nozzle on a MakerBot Replicator is 0.4mm wide. And a single extrusion of plastic is about the same dimension. When we create think features like the sleeve on our knob, it's best to create walls that are multiples of 0.4 millimeters. It's not crucial, our 3D printer will print our object regardless. But if we want to create a part with good structural integrity, it's preferable that these thread widths are touching and fused together. Let's look at our sleeve measurements. The interior diameter is 7mm and the outside diameter is 9. That means we have a 1 mm Wall. In 1 mm we can fit two 2.4 mm of plastic, but that leaves us with a 0.2mm gap. 0.4 plus 0.4 plus 0.2 equals 1. Now that's pretty small, but it's enough to cause problems. It would be better if our overall wall thickness was a multiple of 0.4mm. In this case it…

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