What you really need to do is take the chip out of the empty HP carts and try to install them in the universal carts. Wow really. Sorry, I've never put them in a car. So I can't say anything about reliability and durability. I bit the bullet and spent nearly $1,000 on 4 XL cars, which guarantees 7,000 copies per car. For 7000 copies I need at least 10 years. So spend your money and get HP wagons.
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