Printed circuit boards (PCB) have long since been the gold standard for heated beds. The main advantage of a PCB heating source is the thermal distribution, keeping the temperature spread evenly across the entire surface. While these work great for small volume 3D Printers, larger sizes can take an excessive amount of time to reach temperature. This is where a Silicone Heater will shine, offering a much better heat output/power ratio and usually capable of reaching 60 °C in less than 90 seconds.
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