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You can adjust the size of what you are printing by following these steps:
1. Open the item you wish to print.
2. Click on File and then Print. If File is not visible, please press the <ALT> key on your keyboard.
3. Click Preferences. If this is not available, click Properties.
4. Click on the Page Setup tab.
5. Under Page Layout, select "Scaled".
6. Next to Scaling, increase the percentage to 150 or 200.
7. Click Apply and then OK.
Print the item.
I was experiencing a similar problem. There are several posts in various forums on the internet asking the same question. The problems are not related to printer setup in the applications your are printing from, or in the print settings on the computer. In the process of copying a document on my all in one, I accidentally pressed the Stop and Start buttons simultaneously, this resulted in my printer scaling down the print size by 50%. I tried downloading the manual but there was no information contained therein to resolve the issue. What I ended up doing was the following.
The document then printed 100% to scale. No other settings changes I made in both the printer settings and/or application print settings made any difference. Only after attempting the above procedure did print scaling return to default.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM