Scaled Z to 50%. Printed in PLA. Pause implemented by editing Slic3r gcode with OctoPrint plugin. Details here: https://gist.github.com/jewzaam/9f43dd0607ffb39a23967366121d1174
Note the gist has Z move on restart before XY. This ends up with a small amount of plastic wiped on edge of last layer. I will swap this eventually.