What nozzle size does the MP10 have?

The size of the nozzle is 0.4 mm. 

It uses the same nozzle as the MP Select Mini V2/Pro & the MP Mini Delta.

You can find replacement nozzles in our shops, at Gigidigit.com or in other web shops. Here a few:

https://gigdigit.com/nozzle-0-4mm-select-mini-v2-pro-v3-mini-delta-mp10s-and-m320-qty-2/

https://www.3djake.de/brozzl/duese-messing-fuer-monoprice?sai=6246&gclid=CjwKCAiAnfjyBRBxEiwA-EECLM-9lcOTF5JkqyKrLVVADA1cUnVpp72E1fJkqm9EYLgSbxeN-3O17BoCUXMQAvD_BwE

https://www.amazon.de/gp/product/B0824RJ24L/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1

https://www.amazon.co.uk/Printer-Nozzle-0-4mm-Extruder-Brass/dp/B07H4HMXN5/ref=sr_1_fkmr0_1?keywords=nozzle+monoprice+mini+v2&qid=1584022091&sr=8-1-fkmr0