3D-printing and finishing

When 3D-printing, you typically get visible layers. These irregularities is often desirable to hide.

In this post will show you a method you can use to conceal them and finish the part.

The Subject and the Plan

The model used here was a headphone stand grabbed from Thingiverse. It was printed with PLA, with high speed and pretty thick layers. The infill was 20%.

Yes, we changed filament mid-print.

The plan for making it more smooth (and hopefully increase the WAFwas as following:

  1. 3D-print it.
  2. Apply filler and let it dry.
  3. Rough-sand the filler down using a sanding-sponge.
  4. Apply more filler and let it dry.
  5. Fine-sand the filler by hand using 1200 sand paper.
  6. Apply spray primer and let it dry.
  7. Fine-sand it lightly.
  8. Apply some coats with spray paint.

Some of the steps can be read more about here as well.

Applying Filler and Sanding

After printing you can of course lightly sand the model, but we didn’t do that here. We just applied the filler. We used something called a “fine filler”.

Close up of applied filler
Letting it dry
After the first round of sanding was completed


After a couple of laps called “filler -> sanding” it was time to paint the model.

Spray primer applied and lightly sanded. Ready for another coat!

First we applied spray-primer and when it had dried we sanded it lightly. Thereafter, we added another coat of primer and repeated the sanding process.

After that we applied a couple of coats with a colour spray paint.

The painted model

The Finished Model

We are quite pleased with the finished result. Though remember that a process like this takes time. Not actual working-time, but “waiting on paint/filler to dry”-time.

The finished result!

If you are going to finish a 3D-printed part: Good Luck and don’t hesitate to share your experiences and/or pictures in the comment section below.

Happy making!

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