3 ms·
The temperature needs to be consistent first. There is a PID cycle the nozzle goes through to keep it consistent. If you look at the temperature on a graph du
by snarfy 8y ago
The temperature needs to be consistent first. There is a PID cycle the nozzle goes through to keep it consistent. If you look at the temperature on a graph during print, it's not a flat line but rather a sine wave as the PID cycles. My printer has an LED that flashes with the heating element, and you can see it work more during heavy extrusion to keep the temperature up. The frequency of the cycle is related to the mass of the nozzle/heater and speed of extrusion. I can only imagine at that speed they could not get a consistent PID loop with a traditional heater.
- falcolas 8y agoFWIW, a sin wave is usually a sign of a simple threshold based controller, not a PID loop (or if it is a PID loop, it's very poorly tuned). A well tuned pid loop will not exhibit any periodic tendencies, though I would expect that it would exhibit changes as the filament extrusion is stopped and started.