Replacement Extruder for UP mini 1

Hi Folks,
I have an UP mini 1. The extruder has stopped working. Nozzle is not blocked but the filament just wont go through. I’ve cleaned it out and cleared the nozzle and the gear etc, all to no avail. Is it possible to get a replacement unit anywhere? I’ve tried amazon and ebay. All I can see are parts for UP mini 2. Any advice? Thanks