3D printing on a rotating cylindrical surface

A device configured to make a solid object, the device comprising:

• a cylinder centered on an axis of rotation and being rotatable around the axis of rotation, the cylinder having a surface;
• an applicator that in use applies over at least one portion of the surface a material used to make the solid object, at least one of the applicator and the surface being displaceable in a direction transverse to the axis;
• a controller that in use receives instructions for making the solid object, the instructions being in the form of data indicative of a plurality of individually determined curved layers of material to be applied sequentially by the device, at least two of the layers having boundaries of different shape, and the controller in use coordinates rotation of the surface, displacement of the applicator relative to the surface, and the application of the material by the applicator, such that the plurality of layers of material are applied sequentially to form a stack of the plurality of layers on the at least one portion of the surface in accordance with the received instructions;
• and
• a shaper that in use shapes the material after application thereof;
• wherein the device in use is oriented such that the applicator ejects the material horizontally and rotates the surface in a single direction during the formation of at least a significant fraction of the solid object.