Hi it looks like a Prusa Wades Bowden extruder - see link below to the thingiverse for a printable one.
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www.thingiverse.com]
The hot end looks like a J-head - easily available on Amazon as are other versions of extruder Just search J-head hot end and also Prusa extruder and it will give several Metal Bowden extruder. Or try eBay.
I have the joy of 2 printers, so I can always print parts if one fails and needs something printing. I fact I printed my whole 2nd printer to my own design (Baring nuts, bolts screws & electronics), my 1st printer is a home brew mendelmax style printer.
If you do a search on this site for a Wades Bowden extruder it will get you to the section on Wades and give you all of the versions etc.
Regards Rich