A common issue with shipping label printers is low ink or toner levels, which can affect the quality and readability of the labels, resulting in errors and customer complaints. To prevent this, you should monitor the ink or toner levels regularly and replace the cartridges or drums when they are low. Additionally, use genuine and compatible ink or toner products for your printer model, avoiding shaking or tilting the cartridges or drums as this can cause leaks or clogs. You should also store the ink or toner products in a cool and dry place, away from direct sunlight and heat sources. If a low ink or toner warning appears, check the actual levels on the printer display or software, replace the cartridges or drums as soon as possible following the manufacturer's instructions, perform a test print to ensure quality and alignment of the labels, and dispose of the used cartridges or drums properly following environmental and safety guidelines.