This work presents the electromagnetic design of a 3D-printed winding for a coreless linear motor. The key geometric parameters are optimized with motor constant as the objective. The optimization is applied to two types of coil layouts. An increase of the motor constant up to +26% is observed for the optimized coils compared with the original ones. Several units of the two types of coils are 3D-printed in aluminum alloy and electrically characterized. A glider prototype is assembled and ready for additional tests evaluating experimentally the motor constant in order to be compared to simulations.