https://www.epo.org/en/service-support/faq/about-us/call-artists-paper-transformation/how-can-i-submit-physical-model-i

How can I submit the physical model that I have made to help explain my concept?

In addition to the email submission, any physical models, clearly labelled as a “Call for Artists” submission, can be sent by post or courier to:

Room 3523
PschorrHöfe 1-4
European Patent Office
Bayerstraße 34
80335 München
Deutschland

Or

Room S03N43
Shell Building
European Patent Office
Patentlaan 2
2288 EE Rijswijk
The Netherlands

A photo of the object should be included in the email submission with a note that the physical model has been sent by post. If possible, a tracking number should be included in the email submission.