300w*3 power usage is below 3kW. It's in this article: “Building Filament Extruder” https://medium.com/endless-filament/building-filament-extruder-9cad8df7d35

300w*3 power usage is below 3kW. It's in this article: “Building Filament Extruder” https://medium.com/endless-filament/building-filament-extruder-9cad8df7d357 https://medium.com/endless-filament/building-filament-extrud... I didn't accurately measure it. My way of measurement is simply to run the extruder use current rating from clamp meter and multiply that by line voltage. So I guess the power usage goes down once heater reach target temperature. It's by no means accurate, only guarantee there is that the power usage will be below 3kilowatt. Unfortunately I don't have good meter, the ones I order from AliExpress didn't arrive yet due to Coronavirus lockdown issues. >Beside insulation, could waste-heat from cooling the filament I've no idea. I've a water bath which in which there is a motor which simply moves the water from bucket into the bath then back the bucket. >PS: the video was reversed, right? No, the filament goes behind the spool so it appears as if the spool is unwinding.