EasySDI Map needs very last addings to the Mapfish Print project to print efficiently all kinds of maps.
Specifically, the support of the WMTS KVP request encoding was added recently (https://github.com/mapfish/mapfish-print/commits/master/src/main/java/org/mapfish/print/map/readers/WMTSMapReader.java). These addings are not yet packaged in an official release.
For this reason, a build of the project trunk was made available in the Files section of EasySDI V3 Forge http://forge.easysdi.org/attachments/download/545/print-servlet.war.
For any information concerning this service, please see the offical documentation : http://www.mapfish.org/doc/print/index.html