Zebra zt411 printer prints one label each minute from spooled file.

Are you using wifi, same as the original poster?

I honestly do not know the for sure answer here, but I know a couple of things:
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[li]Zebra Label printers are built like tanks, and oftentimes never seem to die. However, they can be VERY VERY finnicky sometimes and can have seemingly the oddest configuration requirements. I don't think this would be your issue, but I would want to verify that the correct Thermal settings are selected. For instance, if you're using a ribbon and using sticky labels, then MAKE SURE the printer preference is set to "Thermal Transfer" and not "Direct Thermal". Otherwise, it'll give you all sorts of bad issues. For instance, we've had it lock up the host PC's print spooler because one connecting computer had print preferences set to "Direct Thermal" when should have been "Thermal Transfer". That one setting is now burned into my mind. [/li]
[li]Wi-Fi connections can be horrendous for some situations. If possible, test without Wi-fi to see if the issue goes away. Some applications and devices are VERY picky on not losing network signals. Whether Wi-fi or not, it would be good to triple-check the network connecting everything if possible.[/li]
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"But thanks be to God, which giveth us the victory through our Lord Jesus Christ." 1 Corinthians 15:57

Down load different drivers, sometimes older drivers work better. Test with a wired connection first

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Popular Mechanics, 1949