How to Sand Resin 3D Prints for a Smooth Finish

Sanding resin 3D prints is an essential step in achieving a smooth and polished finish for your creations. While resin prints often come out with better detail than their filament counterparts, they can still exhibit a rough texture or visible layer lines, which can detract from their overall appearance. Below is a guide on how to effectively sand your resin 3D prints.

1. Preparation

Before you begin sanding, it’s crucial to prepare your workspace. Ensure that you have a clean, well-ventilated area to work in, as resin dust can be harmful when inhaled. Gather the necessary supplies, including sandpaper of varying grits (generally ranging from 120 to 2000), a sanding block or sponge, safety goggles, and a dust mask. Having a small brush or a can of compressed air handy will also help remove dust as you work.

2. Initial Sanding

Start with a coarse grit sandpaper, such as 120 or 220 grit, to remove any major imperfections and surface roughness. Attach the sandpaper to a sanding block to provide a stable surface. Gently sand the print in a circular motion, applying light pressure to avoid damaging the model. Be patient—depending on the complexity of your print, this initial sanding can take some time. Pay close attention to any support marks or areas where resin pooled, as these often require extra attention.

3. Progress Through Grits

Once you have smoothed out the rough spots, it’s time to gradually progress to finer grits. Move to 400 grit sandpaper and continue sanding in circular motions. As you refine the surface, switch to 800 grit and then 1000 grit. This step-wise approach helps to eliminate scratches left by the coarser grits, leading to a more polished appearance.

4. Final Sanding and Polishing

After reaching 1000 grit, you can opt for even finer grits, such as 1500 or 2000. At this stage, the print should feel smooth to the touch. To achieve an even higher level of polish, consider using a hand polishing compound designed for plastics. Apply a small amount of compound to a soft cloth and buff the print gently. This method enhances the sheen and can bring out the colors of the resin.

5. Cleaning

Once you finish sanding and polishing, ensure the print is clean. Use a soft brush or compressed air to remove any dust particles, and consider rinsing the print with water to remove any remaining debris. Dry it thoroughly before applying any finishes, such as paints or clear coats.

Conclusion

Sanding resin 3D prints is a straightforward process that, when done correctly, can significantly enhance the aesthetic appeal of your models. With proper preparation and technique, you can achieve a professional-quality finish that showcases the fine details of your 3D prints. Always prioritize safety while sanding and consider wearing protective gear to keep yourself safe from resin dust. Happy printing!