What I found to be even more useful about RPi and OctoPrint is that you can run multiple instances of the OP daemon and control more printers, each in another browser tab/instance. If you connect a regular 4-port USB hub to one of the RPi's USB port (and perhaps an WiFi dongle to the other) you can run a pool of 4 printers! Each printer daemon being configurable independently. I don't know yet if it works with 3 printers and a camera
It probably would cost you less than 1 penny per day to keep the bed and nozzle at 10C. What do you think of never turning it off when not in use?
Since you are in "reprap" mode anyway - it's easy to mess with the start and end gcodes. You could probalby set the end gcode to leave the bed and nozzle at 10C. At least when the weather is forecast to be below 5C.
As far as letting parts cool - the glass temp of PLA is around 55C. If the bed temp is below 50C it should be safe to pry the part off with a putty knife. But above 60C it's not worth the risk.
Alternatively, I have placed the glass under hot water (I made sure the water was at max temp before letting it touch the 60C glass). This dissolves the gluestick glue and makes it easier to pop the part off once you get a square millimeter of corner up and let water in. Also alternatively I have removed the glass with gloves and waved it around in the air up and down to speed up cooling yet still cool evenly (glass tends to shatter if you cool it unevenly - UM doesn't use pyrex).
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