How to Sand, Prime, Paint, and Smooth 3D Prints for a Pro Finish
Quick Answer: Start with a clean print at 0.12 mm layer height. Remove supports and defects, then sand with 120 to 400 grit. Apply filler primer, wet sand, and paint in thin coats. For glossy resin-like finishes, use solvent vapor or epoxy coating. Always wear a respirator when sanding or painting. Most 3D prints do not look finished straight off the build plate. Layer lines, support scars, and tiny gaps are normal. You can hide them with a careful post-processing routine. The process includes sanding, priming, painting, and smoothing. Each step trades time for a cleaner result. If you want a professional finish, you need to plan for post-processing before you print. Check how layer height and filament choice affect your results in our PLA vs PETG vs ABS guide. A lower layer height, around 0.12 mm, creates finer lines that are easier to sand. PLA prints at a nozzle temperature of 200 to 210 degrees Celsius and a bed temperature of 50 to 60 degrees Celsius. Those settings give you a stable, smooth base. ...