I have not personally checked the amp draw on the Bambu lab printer under full load @ 120 volts.
You also might want to look at the specs of your UPS to see how many watts it can handle if it is 1800 watts it would support a 15 amp load if your ac power source is 120 volts.
If this information posted on this link below is correct you can see it’s around a 9 amp at times if your voltage is @120 volts if your house voltage drops too much on the WiFi smart switch it can make the over current protection kick in and shut the power off to your printer.
Yes I would look for a 15 amp appliances smart switch it will have more over current room to work with with less fire risk.
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