3D dental printers can work continuously for days. However, there are a few steps to follow to ensure that your printer is ready for a huge printing job. Ensure that the print surface is perfectly clean and dust-free. Make sure the bed leveling is correct to ensure first layer adhesion to the print bed. Cheaper printers can take between 6 and 7 hours to print a model. More expensive models can do the printing in 20 minutes.