I’ll try putting both machines through a good cleaning, but I really don’t think that’s the issue. I’ve needed to pry parts off the mini starting with the first print of the rocktopus/octopus.
How are other people measuring the first layer thickness? Just print a single layer plastic sheet and measure it with a micrometer? I don’t actually have a micrometer, but I do have a decent digital ruler from Amazon that claims it can do 0.001 inches. I don’t know how much I trust that the accuracy of the ruler is that good though.
If it is a first layer height issue, I wonder if the issue isn’t simply that auto bed leveling works better on the mini then the TAZ 6. I can see how the much larger print surface would make it more difficult to make to make leveling work well.
BTW, I’ve found on the mini that the default gcode header doesn’t always wait for the bed to be completely heat before it starts printing. Sometimes the bed temp will be so low that I end up with a mess to cleanup. Lately, I’ve been manually setting the bed temp and waiting for it to completely heat before starting the print. It seems to make the auto level work a bit better.