This resin is available by the mL, and the FreeForm slicer says how many mLs of resin are used in a print. The cost per mL also includes the cost for the isopropyl alcohol bath.
This allows specific amounts to the penny, helpful for Markforged printer costs which display as $21.16 for example, you can enter 2,116 credits to get that exact amount.
Glass etching cream. *THIS IS A DANGEROUS CHEMICAL. YOU MUST WEAR GLOVES! IMMEDIATELY WASH SKIN IF EXPOSURE OCCURS* Info here: https://hpd.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=1029001