HPGL Export for Rhino 

HPGL Export for Rhino is a HPGL plot file export plug-in for Rhino. This plug-in gives Rhino the ability to export geometric data from Rhino to HPGL Plot (PLT) files.
hpgl export for rhino hpgl export hpgl export exporting save hpgl save as plt plot file rhino plug-in plugin