You should be able to print any Accredible certificate yourself.
First, you need to go to your certificate. It will be at a URL like credential.net/10000123.
On the sidebar for your certificate, click 'Download PDF'. This may take a moment, but once it is done, a PDF copy of your certificate will open up in a new browser window.
Once you are on the PDF, you can print the certificate by going to File > Print in your browser window. You can also save a copy of the PDF and print at your convenience in the future.