@phaedrux
This worked! I was able to tune correctly and the bad model parameters were probably that heater 7 shouldn't have existed.

@cosmowave

I ended up more or less doing this. I still don't understand what was happening and that bothers me, but it's working now.

@rjenkinsgb I don't have a brush at all. I haven't figured out how to get the slicer not to call for the brush script, but I don't actually have a brush set up.

@rjenkinsgb

Here it is: brush.g

I am having trouble with my tool head seeming to lose its offsets after it does the auto brush during a print. I'm attaching my gcode for the simple test print here I'm using. It's a 1mm tall bocx. On this print, for example, the first layer is fine, and then after doing it's little brush dance off to the side, the next layer is way off on the Z as well as the X axis. Then when I cancel the print, the tool head doesn't seem to know where it is on the X axis because it crashes T0 into T1 when its dropping off the tool. I'm not sure what's going on. I don't like this brush feature anyway so maybe I just need to remove that, but I'd like to try an understand the issue at least.

Here is the gcode for the test print:
Shape-Box.gcode

Also attaching my config file:
config.g

@dc42

Got it. And that is because the SSR is controlled by the board but the power from the PSU doesn't run through the board, rather it runs through the SSR?

Sorry for the basic questions. I am learning...

I ordered a more powerful PSU (1000w) and an external MOSFET so once those come in I'm going to re-wire everything and try this out.

@dc42

So would it be safe to replace the Duex5 fuse with a 15A one and run the heaters as I have it set up? Or would that potentially draw too much power for the Duex heater output?

The bed heater is AC powered through an SSR.

I guess I'm confused again. I am currently driving the bed heater with the SSR but I am still using the Duet bed heater output for the bed itself. I have the heated bed screw terminals connected to the SSR input. So how can I use this output for the chamber heaters?

The system is 24V. It's an E3D tool changer. The only things that are different is I'm trying to set up a chamber heating system and there is a liquid cooling system that is also currently being powered from the same power system.

Below is the heating element I'm using. One 250W and the other 100W wired in the same circuit.

https://www.amazon.com/Fdit-Constant-Temperature-Heating-Element/dp/B07JKNKK7J/ref=pd_sbs_3/142-6312925-1470019?pd_rd_w=yqFT0&pf_rd_p=a5925d26-9630-40f3-a011-d858608ac88b&pf_rd_r=WR8TCF09MQXHXVNAXFB0&pd_rd_r=a293fa7e-119d-4317-aacd-727f39a10930&pd_rd_wg=YjRj2&pd_rd_i=B07JKNKK7J&psc=1

Also, the PSU I have is 400W so it seems like I need something beefier, huh.

@Nurgelrot

I don't think I understand what you mean. Here is a picture of the wiring setup. The red circle is the heated bed and the yellow circle is the chamber heater setup which consists of two separate heating elements that are 250W and 100W.

I blew the 7.5A fuse on the Duex5 board. From what I can gather, the fuse is for the V_IN itself. I blew it when I was running an 800W heated bed and 2 chamber heaters (250W and 100W) at the same time. The heated bed is wired through the Duet board while the chamber heater is wired through the Duex5 heater input.

I think 7.5A might be too low for what I have going on here. Is there any issue with replacing the 7.5A fuse with a 10 or 15A? The V_IN screw terminal is rated for 25A I believe.

@phaedrux

Okay that makes a lot of sense. Thanks.

@phaedrux

I spoke too soon. I tuned the heater with the thermistor pretty close to the heater because otherwise I kept getting the "auto tune cancelled because temperature is not increasing" error. So I moved the thermistor and was able to get it to tune, but then I moved the thermistor to above the print bed. After moving it when I tried to run the heater it would never get up to temp. So then I tried to re-tune with the better thermistor position and I got the auto tune error again and again.

I ultimately want the thermistor to be above the print bed for reasons but I cant get the heater tuned in that position.