I just got the Filastruder running a few days ago. The PV on the PID jumps around wildly. Within 5 seconds it can vary 15 degrees up and down. I've tested with both a replacement thermocouple and replacement power supply (I thought I botched both during set up), but neither affected performance. I tried a run to 175 C, and it was able to heat and hold the temperature in that general range, but was still varying wildly. I've checked the wiring a few times and all seems well.
Has anyone else seen the temperature jump around like this? Are there any suggested solutions? My serial number is 2418.
When building the Filastruder I messed up both the thermocouple and the power supply. The thermocouple I trimmed the prongs too short and had to take the wires out of the housing and wrap them around the screw terminals. I also accidentally stripped the inner insulation off the power supply wires when trying to pull them out of the main insulation. So I opened the power supply (dangerous, and not recommended) and replaced the wires soldered to the main board in there.
Since it was misbehaving, I get a new thermocouple and the picture of it is below. I then got a new power supply - 12V/6A (It appears to be the exact same model as the original - also pictured, with wires dangling out the side). I also added the fans, even though I'm planning on using a Filawinder.
I ran the Autotune, but it only ran for a few minutes, while the issue was occurring. After replacing the power supply and the thermocouple, it still had that issue.
I just re-ran Autotune (at 200 C) with no change in stability. Here's an earlier video of it bouncing around at room temperature:
I think my next steps, after posting pictures and whatever feedback comes from here, are replacing the rocker switches (I originally botched this by soldering to them instead of using the spade terminals) and the PID controller. Is it possible it's just a bum PID controller?
Confirmed to be something wrong with the PID. I replaced it with one from eBay (Inkbird D1S-2R-24) and it doesn't do the weird bouncy dance. I accidentally ordered the wrong PID the first time around - model D1S-2R-220, which was supposed to run on AC 220V. Oops. I should have useful extrusions soon. I'm excited!
