I must be missing something because I can't imagine that Cura would remove this feature. I can no longer find the manual extrude and retract command in Cura 3.4.1. I'm using a Printrbot Simple Metal Extended. I've read that the these controls should be under the Printer Controls menu in the Monitor page, but they do not appear for me. I only see X, Y, and Z axis and Jog Distance controls. Without these controls I cannot use Cura to load and unload filament or clear jams.