A simple temperature control system (for 3D print or other constant temperature control purpose)

[Note: if you are using smartphone or portable device to browser this post, some math formula might not appear properly. To see the math in correct form, scroll down to the bottom and click "View web version"]   After finishing the mini CNC laser engraver, the next thing in my mind is 3D printer. One of the most important part of a 3D printer is the plastic filament extruder, composed by a cold end constant ...

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