@stuWalker,
Welcome to HP Forums, this is a great place to get support, find answers and tips.
Thank you for posting your query, I'll be more than glad to help you out.
I understand that you are unable to print from your HP PSC 1315 All-in-One Printer.
Don't worry as I have a few steps that should help fix this issue.
And here's the step by step guide for you in the link: Troubleshooting Print-Quality Issues
Let me know how that works.
I hope you have a good day ahead.
Rainbow23 - HP Support.