I wrote the BOM at the bottom of the description, there are formatting issues below. BOM: -2 each of the provided stl files -4 small binder clips 20mm wide -4 3mm bolts ~10mm long and nuts -6X6 printrbot heat bed PCB from http://printrbot.com/shop/6-6-heated-bed/ or http://3dpaftermarket.bigcartel.com/product/printrbot-metal-bundle (this one includes thermistor) -printrbot aluminum print bed 6x6 from http://printrbot.com/shop/printrbot-aluminum-6x6-build-platform/ -thermistor with cable http://printrbot.com/shop/thermistor-with-cable/ -ATX power supply or other 12 volt source capable of running the higher draw of a heat bed. -"Y" adapter for the ATX power supply from printrbot http://printrbot.com/shop/y-power-adapter/ If you are handy you can make the Y adapter part with the existing connectors that comes with the ATX power supply and jump the green wire so the box will power up http://help.printrbot.com/Guide/Power+Supply+Cabling/16 This video shows you pretty clearly what the connection looks like and how to connect adapter https://www.youtube.com/watch?v=bqF0m7xMMms -Optional: You may want a box for your ATX power supply, there are lots around. This one is a spool holder too http://printrbot.com/shop/power-tower-with-spool-rack/ -Finally you might want some cable wrap to keep the heat bed and thermistor wires neat and tidy. Instructions: Assemble as shown in photo, mounting holes in STL file are tight but allow for better self tapping into the plastic, you can also put a nut in the captured nut space. Using the aluminum heat bed from printrbot you you won't need to make any changes to your z sensor (I would use caution the first time to make sure you didn't move anything while installing this mod - go through the M212 calibration process). Once installed you can easily add or remove the bed without making calibration adjustments. Remember to do all of your z height calibration with the heat bed at temperature. I have included a PDF file that shows you where to plug in the heat bed, thermistor cable, and power supply. Finally, you will want to send the following code to your machine M211 X150 Y150 Z140 to compensate for the slight decrease in Z travel because of the heat bed thickness then M500 to save and M501 to check your work.