Question

sls: printer characteristics use the information below to answer the question. layer height the layer height selected for sls is typically 0.1 millimeters thick. this is the same height used by desktop fused filament fabrication machines when printing parts on the highest resolution setting. powder size the other aspect that affects the surface quality of printed parts is the size of the powder. finer powder particles will create parts with a higher resolution and better surface quality. however, issues may occur with the spreading mechanism used during the re - coating. a coarser material could have a detrimental effect on the surface finish. bin size when planning an sls print, bin size and packing is an important consideration. the efficiency of the build will depend on the orientation of the forms and how well they are placed within the bin. each bin has a fixed size. however, the total print time will be determined by the height of your build. the print cycle will take the same length of time regardless of the number of items being created in the batch. what can have a detrimental effect on the surface finish of an sls print? a polymer powder a drier material a thermoplastic powder a coarser material

Explanation:

From the "Powder Size" section: "Thinner powder particles will create parts with a higher resolution and better surface quality. However, issues may occur with the spreading mechanism used during the re - coating. A coarser material could have a detrimental effect on the surface finish." So we analyze each option:

• Option "a polymer powder": Polymer powder is a common material for SLS, and the text doesn't say it has a detrimental effect on surface finish.
• Option "a drier material": The text doesn't mention drier material affecting surface finish.
• Option "a thermoplastic powder": Thermoplastic powder is also a common SLS material, and no detrimental effect on surface finish is stated.
• Option "a coarser material": As per the "Powder Size" section, coarser material can harm the surface finish.

Answer:

D. a coarser material (assuming the options are labeled A - D with D being "a coarser material")