Mean Well LRS-350 Upgrade

In Configuration.h look for #define PID_AUTOTUNE_MENU it shows on line 486. Uncomment this and you can then go to Configuration -> Advanced Settings -> Temperature -> PID Autotune. I think that's the menu location.

I checked my configuration that I compiled from and see that I don't have PID enabled for the bed. My configuration was based on Makertech's so if it was enabled in their firmware configuration by default then it should be in mine. I might turn it on, but it seems like my bed is holding pretty well.

If you're inclined to enable PID on the heated bed then go to line 514. This starts the heated bed section. On line 531 uncomment the line to enable PID. I don't see a configuration to enable Autotune from the LCD specifically for heated bed. The way the gcode command works is that you run for PID tuning at 200C for the hotend is:

M303 S200 E0 U

This will run the autotune on the hotend at 200C and use the result.

The bed can be done with:

M303 S60 E-1 U

This will run the autotune on the bed at 60C and use the result.

Note, E0 is for the hotend and E-1 is for the bed. The LCD might ask to specify a hotend and bed temp and perform both. If someone enables PID for the bed please post your results.

@Michael G Hmmm. Line 527 is #define PIDTEMPBED -- I'll assume that is what I need to remove comment slashes for. Line 529 is //#define BED_LIMIT_SWITCHING... Not sure how come my line numbers are off from yours. Line 531 is the start of a comment block for me.

I went Googling for BED_LIMIT_SWITCHING, which then led me to reading about PIDTEMPBED, which then made me start charting the bed temp (at least while it sits there idle and not printing. Seems a lot of folks turn this on because their bedtemp swings +/-5C ... I go down to 59.7C turns on and goes up to 60.5C then back down and oscillates right around there for the last 5-minutes or so. I think I'm fine, you can also see how long it took to get to 60C in the graphic.

Going to re-wire with the 16-guage wire tonight, and probably work on Dual Extruder, and getting the Y- and Z-axis as tight as I believe I've gotten the X-axis. Off to do to that now, will probably try to get the bed back to 80C for PETG, and maybe 100C ... will close the basement door in case I get another SHRIEKING runaway alarm. :-)

Before I changed anything I wanted to check how long it would take the bed to get to 100C and if it could hold it there for 5-minutes with no runaway... again, without the heading being heated at the same time, and without any actual stepper movement... who knows what actually printing ABS would be like.

It takes 10-minutes for it to get to 100C. At about 78C the Mean Well fan comes on and stays on until it gets to 100, and then anytime the bed reheats, clicks back on, sometimes cuts off between cycles, sometimes just stays on. It is hard to keep it at 100, stays about 99.1-99.3 a lot of the time. Only dropped to 98.9 on one of the polls.

I didn't notice this plate popping up like another one did, so maybe I won't need to go glass after all.

Turned the head on, kept it at 210 a little bit, 250, then 255. Moved the XYZ quite a bit (though not at same time - should have re-homed had I thought about it)... no runaways, things seem to be working great. Was thinking about using the MOSFET, but now I think I should just leave the power coming from the mainboard. Hmmm. Getting rid of it would make room for my 24V -> 12V buck converter to swap out this chassis fan with a Noctua. I dunno.