> Of course, the simultaneous operation of all printers is intolerable.Why? Server was written to allow them to operate in parallel without interference.If you have a pi 3 or higher you can easily run 4 or 5 printers without webcam. With webcam you can if resolution is not too high and they support hardware mjpg. But you need to check power usage on pi - that is critical especially with many printers any electronic problem can get problems on other components as well. See the bolt menu to see if you e.g. had undervoltage. In general I'd not allow printers to draw current from the pi, seehttps://www.repetier-server.com/knowledgebase/undervoltage-and-throtteling-of-pi/on how to prevent that. Then only webcams and display draw current.Also use fast sd card to not get small pauses when you upload bigger files.