Make sure you are printing your PDFs with Adobe Acrobat. Truly a Game changer.
Finally used Adobe Acrobat. WOW. I can't believe how good it is. It basically cured all the imperfections in quality, text...even 300 DPI scryfall images still look great.
If I had known it was free sooner (not sure why I had the impression it costs money) my prints would of been this high quality this entire time. Feel like a complete buffoon for not using it sooner. I'm sooo blown away at how clear and real close to looking like an actual mtg card they get now. I thought they looked real-ish enough before using Adobe, but using it now? It looks damn real now. Genuinely.
My main thing that kept puzzling me with printing on Firefox and the PDF file viewer the browser had was the prints would come out fine, but lose quality when my printer was not set to auto color settings. When I would play around with slider settings, and take it off the auto option, the sharpness would completely take a nose dive. Now with Adobe, I can't believe how crisp and detailed everything looks. I feel like without the white back you wouldn't be able to tell a difference now. Insane.
The main thing it fixed? Text. One thing that always bothered me about my proxies was the text. I could never get it as crisp as it looks on a real card and by God I finally have it. Just had to switch programs.
Do not skimp out on using Adobe Acrobat.