How accurate is an online PCB quote? The accuracy of an online PCB quote can vary greatly depending on a number of factors that include the complexity of the design, information provided, and details in the manufacturer's quoting system. For example, a quote obtained from an online tool can be quite accurate for uncomplicated designs, where you enter parameters like the size of the PCB, layer count, and quantity. However, in projects with more complex processes, such as projects involving special materials or advanced specifications like high-frequency PCBs and flex PCBs, the quotation given may just serve as an estimate, and the actual price may be quite different by up to 10-20%.
A study by PCBWay shows that 70% of the online quotes for simple PCBs that are up to 2 layers with a standard FR4 material match the final cost if the design is within the basic parameters specified in the quote request. In the case of advanced designs requiring specialized needs, like multi-layer boards, the accuracy goes to around 60%. A report from PCB manufacturers like NextPCB points out that materials can differ up to 30% in cost for Rogers or Teflon, depending on their availability and lead time.
Online quotation tools often quote based on a standard configuration, so if the configuration of a design differs from the norm, prices may be off. For example, adding extra layers in a PCB could be expensive, advance components such as BGAs may be required, or the specification of high-temperature materials may increase the quote significantly. Most vendors encourage customers to provide detailed Gerber files and other specifications to derive an accurate quotation. According to an expert from JLCPCB, "The more details you provide, the more accurate the quote it will be."
Another factor that affects the accuracy of online PCB quotes is the volume of the order. Many suppliers apply tiered pricing models, in which the cost per unit is lower when the quantity ordered is higher. For instance, the cost per unit for a small batch of 10 PCBs could be $5 each, while ordering 1,000 units may lower the cost to $1.50 per unit. However, this kind of discount structure might only be reflected after the manufacturer has gone through the order in full detail.
For an immediate and relatively decent pcb quote, investment in accurate and complete data will find a better match with the last price of the standard design. In any case, it is always important to take online quotes as estimates, especially when dealing with complex or customized PCB projects.