3D Printed Shafts

With the lathe out of order I set to 3D print PLA shafts for my next robotics project. How would my MP Select Mini V2 hold up against tight tolerances and high accuracy?

The verdict: quite well!

Colson and Bushing on 3D Printed Shaft

A modeled .500" diameter came in 6 thou undersized, a good sliding fit for the bushing it rides in. However, the first few layers off the print bed came in right on size. Perhaps this effect was induced by a nozzle too close to the build platform, from build-plate heating, or from natural material contraction. I hope to test this in Nylon 910 and carbon fiber Nylon 960 soon.

The Colson required a wider diameter of .507" to firmly press fit on. This dimension came in right on size at .5075" (measured with cheap calipers: be wary). An MXL 36T pulley was printed which turned out quite well.

Overall I'm quite pleased with my newfound shaft technique. The parts are accurate enough for most work I do. Depending on the job, a stronger filament may be required. I'm quite tempted to avoid the lathe from here on in, perhaps only for final concepts.