Have you contacted the seller first?

Of course there are different sellers, but I've had pretty good comms with the seller I bought from.
Gave me a partial refund,
Sent replacement PSU
Sent replacement motor cable.

If you are lucky, the seller sent the item insured.
You can ask the seller to make a claim against the courier to get a replacement printer that way.

A lot of chinese sellers want to keep good feedback on ebay, I would have contacted them before starting any case.
So before contacting Paypal, email the guy and either ask them to swap the printer with another, or make a claim against the courier.