3D printers are very important machines; however, they can produce disturbing noise depending on the 3D printer you are using.
To get rid of groves in 3D printing, you need to optimize your 3D printing slicer settings and temperature, as well as replace the essential mechanical parts on your printer.
It depends. The printer bed area, the object’s size, slicing settings and the spacing between each model. You can 3D print multiple objects through sequential or single process printing.