What application are you printing from?
Does the document appear ok in preview?
Do you get any error messages?
Ok, you will need to install the latest OS X 10.11.x print driver for your printer from the Epson website:
Avant Garde is still supported; however the Epson font name for it is "Geometric 711 SWA":
Hi, just checking in on your question, do you need any further assistance?