Sample roasters, accessories, spare parts, and more › PCB Motherboard Image 1 of 1 PCB Motherboard €350.00 The brain of the ROEST sample roaster. Changing the PCB is easier than you might think! Here is the guide for replacing this part. Add To Cart Added! The brain of the ROEST sample roaster. Changing the PCB is easier than you might think! Here is the guide for replacing this part. You Might Also Like Quick View Conversion kit €120.00 Quick View BT sensor (Bean Temperature) €40.00 Quick View Metal filter - under bean cooler. €30.00 Quick View ET sensor / Air sensor €40.00 Quick View Hopper for 200g €110.00