The price difference is based on the number of powder recycles, print layer settings and final polishing processes. according the video and pictures here
0.3€/g option: Use multiply recycled 316L powder, ordinary print layer thickness, simple mechanical polishing. This is the most economical option that meets general needs.
 0.4€/g option: Uses 1-3 recycled 316L powder, fine print layer thickness, mechanical polishing and short manual polishing. This option will achieve a finer and more uniform print effect and higher quality surface treatment. 
0.6€/g option: Uses 1-3 recycled 316L powder, ultra-fine print layer thickness, extensive manual polishing. This is our highest-end service that can achieve nearly ideal print accuracy and appearance quality. 
 
How much is your print parts how much you purchase.Files in STEP or IGS version，send to hello@3dpbs.com，we get you quotation in 24 hours.