What fan speed should I use with PLA? Do I need to manually set the fan speed in ‘Control’?
Also, on the filament cartridge Bed Temp is listed: "No heat/60-80 °C". Does this mean heating the bed is optional?
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What fan speed should I use with PLA
The answer is that it depends on the hotend temperature the area of the printed layer and the effectivity of the fan. It is best to print some test prints to find the optimum for your printer. E.g. prints with overhangs/slanted object are good tests for this. Normally a Bench y is not a calibration object, but the bow of the Benchy is an example, incorrect temperature (too hot) and too few cooling will result in the bow sagging out.
Do I need to manually set the fan speed in ‘Control’?
No, the slicer can schedule the cooling speed percentage for you.
Does this mean heating the bed is optional?
Yes, PLA doesn't shrink much, so it doesn't necessarily need to be heated up to the glass transition temperature (temperature at which the filament becomes soft) of the plastic. It does require to take extra measures to get it to stick to the bed surface.