The usual HP toner printers that did to sided printing ca 2009 usually smudged the toner if you did two sided printing in card stock. But the big
How BIG does your printer have to be to reliably do two sided card stock?
Smudging means that the rubber feed rollers are slipping. Clean the rollers or stop using high gloss (slippery) cardstock.
I could answer that if you would offer a clue as to how many pound cardstock you need to print or what printer you are using. The maximum thickness paper should be in the printer paper handling specification.
What's critical for printing on cardboard is whether you have a straight or bent paper path. If the paper path is reasonably straight, it might work. If the paper path bends back onto itself in the form of a "U", you'll be lucky if you get anything over 24 lb to work.
Also, your printer driver has some settings which include the paper type and thickness. This setting needs to be set to something resembling the paper you are using.
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