Hi wgp,
I would like to offer a suggestion to help with the custom paper size not being available with this new HP Photosmart 7520. The steps below are lengthy, but I think this should help.
The 7520 printer should already be installed for the full features.
Step 1. Download the BASIC driver package for the Photosmart C310a and extract the driver package
Step 2. Close the installation window that comes up.
Go to ‘Devices and printers’ then ‘Printer properties’ and then the ‘ports’ tab.
Step 4. Next choose 'Add a printer' from the devices and printers folder.
Step 5. Choose 'Add a local printer'
Step 6. Choose 'Use an existing port' and in the dropdown list,
choose the one with the 7520
Step 7. On the next screen select 'Have Disk'.
Step 8. Open your temp folder (type %temp% into the start search bar and click enter) and then open the 7zxxxxx folder where the C310a software extracted to.
Copy the path and paste it into the box that popped up in step 7, and press 'Ok'.
Step 9. Choose the HP Photosmart Premium C310 series driver and click 'Next'.
Step 10. Name the printer. (You may want to call the printer something unique like 'Custom Sizes Printer' so you know how to identify it). Then click 'Next'.
Step 11. Choose not to share printer and click 'Next'. Then choose whether to set as default and click 'Finish'. (Do not print a test page at this point).
Step 12. Now open the file you were trying to print and choose the new 'Custom Sizes Printer' driver, then click 'Preferences' or 'Properties'.
Step 13. Go to the 'Features' tab and under 'Size' choose 'Custom'. A window will come up allowing you to name the size, choose the width and length, and save the paper size. Set your preferred settings and click 'Ok'.
Step 14. Press 'Ok' on the 'Properties' window and on the 'Print' window and your document should now print to your printer on a custom paper size.
Please, let me know how this works for you.
Thanks,