@arstechnica > Only decent HP printer used for years, working with various companies, not related to each other but used same printer. At the time ONLY one could find reasonably priced for 'in the field' was the 5650 HP as we needed easy to use 'on board' banner printing for our logs to be given to 'higher ups' with our Daily Report. They eventually bought them 'pieces parts' on E bay ( repair-replacement) for a while till they finally got too outdated to use.

@arstechnica
Simplified mud log example on the 5650 HP printer. Everything is plotted against depth ( by hand) Gama (blue), ROP ( rate of penetration) at a given ( vertical) depth (green), shale and sand percentages at a given depth, yellow (SD) grey (shl) in lithology area. Total gas seen at given depth ( red) and chromatographic breakdown of the total gas ( far right) Methane, Ethane, Propane, iso Butane, Normal butane etc...