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When designing products, prototypes, or parts you might want to consider these things during the design process.

FDM generally needs to support areas where steep angles or overhangs are to be printed. The area that has been in contact with the support material can look slightly unfinished in comparison to the rest of the model.

SLS has no need to use any supports and the nylon powder the parts are made from supports the object through the printing process.

Resin printing can leave scars when the supports are removed. This printing process uses supports differently and has a minimal contact area on the parts.