If you install non OEM ink cartridges you void the warranty. If you install a CISS you void the warranty. If you clean or replace the sponge you void the warranty. If you empty the waste collection tank you void the warranty. I have had a Canon and an Epson printer for years. The Canon has a CISS, the Epson has non OEM refillable cartridges.
I have sent stock of various thicknesses through both of them for years. I have yet to encounter any problems with the thickness of the paper or card stock I have sent through each of them thousands of times over the years.
Canon MG 5220 printer paper weight specs:
Paper Weight
"17 to 28 lb / 64 to 105 g/m2 (except for Canon genuine paper)
Do not use heavier or lighter paper (except for Canon genuine paper), as it could jam in the machine."
67 to 110 lb /176 to 199 gsm used regularly for all of these years. No jams or problems due to paper weight/thickness.
Epson WF 7610 printer paper weight specs:
Paper Weight
"17 lb (64 g/m2) to 24 lb (90 g/m2)"
67 to 110 lb /176 to 199 gsm used regularly for all of these years. No jams or problems due to paper weight/thickness.
Both user manuals state you can print photos, greeting cards, and business cards all of which use paper stock that is in most cases at least the same thickness as 67 lb/ 176 gsm stock.
The Canon printer has been in use for over 10 years. The Epson printer has been in use for 4 years. Both were purchased as new machines.
This has been my experience with printers that do not specify that 110 lb / 199 gsm card stock can be used.