Objects created with a 3D printer do not always look as good as they should. While the rendering of 3D printed parts is generally acceptable, this may not be sufficient if the object is intended for sale or display. Some people simply want a perfectly smooth, shiny surface for their 3D print. Fortunately, it is possible to achieve this level of perfection with the right tools. This tutorial explains how to smooth your ABS and PLA 3D prints for optimal results.

An FDM 3D printer offers endless possibilities for creating PLA 3D prints. However, parts can be printed with unfortunate layers that need to be removed. If you want to give a shinier look to your parts printed via a 3D printer, know that there are more or less simple methods to smooth a PLA 3D print.

Use spray paint and polyurethane

The sanding method using sandpaper was previously the most common technique used to smooth a PLA 3D print. Today, new alternatives have emerged. You can use spray paint mixed with polyurethane to smooth your 3D printed PLA parts. To do this, you will need the right tools:

• spray paint,
• polyurethane,
• a fan to dry the part.

The smoothing process is one of the simplest. The first thing to do is to clean your piece to prevent dust or other dirt from getting trapped on the surface of the object. With your spray can, cover the 3D print with a layer of paint. You can then apply a layer of polyurethane to the part. Being very careful, place your freshly coated 3D print under a fan to accelerate drying.

After a few minutes, you’ll find that the polyurethane/paint mixture begins to fill in unwanted holes and imperfections on your PLA 3D print. Once the part has dried completely, you can coat it with the mixture again to remove any lingering defects on the surface. This method is less tedious than sanding with sandpaper.