The number of layers is one of the most significant factors influencing Manufacturing Cost. More layers in a PCB Design mean more processing steps, longer production times, and higher technical requirements. In PCB Design, we aim to minimize layers while ensuring EMC and signal integrity. Whenever possible, 2-layer PCB Designs are prioritized to reduce Manufacturing Cost. https://www.pcbhamal.com/how-to-check-pcb-design-decisions-impact-manufacturing-cost/