Inserting names for OP is a pain. I have these functions which recursively finds all FETs, insert the OP save commands and checks everything is where you want it https://github.com/yrrapt/spice_interface/blob/main/SpiceInterface.py#L274 https://github.com/yrrapt/spice_interface/blob/main/SpiceInterface.py#L287 https://github.com/yrrapt/spice_interface/blob/main/SpiceInterface.py#L403