Hi

We recently procured a Makerbot Replicator (5th gen) 3D printer and set it up as per the instructions in the manual. We loaded the filament in the extruder and a little bit of molten PLA came out. However, we couldnt print that time as we didnt have a model available in the correct format.
Subsequently whenever we try to print, nothing comes out of the extruder. We have unloaded and loaded the filament multiple times as suggested in the troubleshooting documents but it still doesnt work.
Havent been able to print anything at all! Please help!!!