HotBed Heating Too Slow?
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@mac PID tune the bed using
M303 H0 S60Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is
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I had the same issue. You need to run a PID tuning cycle on the heat bed and put the resultant code into your config.
https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control
TL;DR
You need to run
M303 H0 S60(H0 is the bed heater, change if needed, and S60 tells it to take the bed to 60C, change as needed)
It may take upwards of an hour plus to run. It'll output an M307 code line, that you need to put into your config.
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@mac if you think it's a 3950 thermistor, I would set that as the thermistor and not how you currently have it.
And without trying to be rude, can you not post new thread after new thread, this is all for one printer yes? One thread will ALL your issues in would be a lot easier to help with.
Follow my adventures in 3D Printing, laser cutting and electronics. https://linktr.ee/Rushmere3D
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@rushmere3d no one’s been that clear. Thanks; I’ll make this the one and only thread of my issues and experiences from now on.
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@mac said in HotBed Heating Too Slow?:
@rushmere3d no one’s been that clear. Thanks; I’ll make this the one and only thread of my issues and experiences from now on.
Well... within reason. Eventually threads can get so long that it can become difficult to follow or get caught up. Having ten issues in a single thread with a title that's unrelated to all of them isn't great either, because then people may skip over the thread title and not see your actual issues.
Since you're just getting up and started with Duet it's understandable you have a lot of questions as things arise. Maybe try and keep it to one thread for each major issue and keep related questions there.
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@phaedrux I certainly think a thread titled appropriately with one complete set of config files would be far better than random threads with little context.
Also makes it easier for people looking for answers to questions already asked.
Follow my adventures in 3D Printing, laser cutting and electronics. https://linktr.ee/Rushmere3D
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@rushmere3d said in HotBed Heating Too Slow?:
@phaedrux I certainly think a thread titled appropriately with one complete set of config files would be far better than random threads with little context.
Also makes it easier for people looking for answers to questions already asked.
Yes absolutely. But eventually the config changes and problems are solved and it's 200 posts long. So eventually a fresh start is helpful.
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@phaedrux eventually yes, once most issues are addressed. Anyway back to getting another duet user going hey.
Follow my adventures in 3D Printing, laser cutting and electronics. https://linktr.ee/Rushmere3D
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@techmav thanks for the treatise on PID turning.
Ah, what does PID stand for?
I have zero experience with communicating via gcode. If fact, I don't like the idea of converting thoughts / language into code for the purposes of communicating. On the other hand, I recognize that using code to lump a bunch of ideas together works. But a long doc full of code-speak, none of which says "this is how you actually do this," well . . . that's rough. I get it that one needs to do this, but jeeze-louise, it's tough of noobies.
So here's what I know: at the top of DWC (I'm using code to shorten this up), there's this long line that starts with "Send code . . ., after which there's this blue box with an arrow pointing right, and the word: Send. Are you suggestion I type something into that box, and send it to my printer so it can do PID tuning? This is the stuff I'm missing in a lot of the advice and recommendations I'm getting. And because I don't get the fundamentals, the advice is lost on me. We're all wasting our time. What might be better? Someone saying, "Type the following into that line on the top of your DWC. Send what you typed to the board. Wait for the board to process the information. When it's done, look somewhere, and copy that information (somehow), and put it in your config.g file (somehow). That's what I'm getting from reading your wonderful, informative post, and skimming down the pages and pages you sent me (that you, by the way, that was very helpful long term).
Mac
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@jay_s_uk read a bunch of these posts, decided to give your striaght-forwards reply a shot. Thank you. Mac
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@mac
TL;DR
In the web interface, click on Console on the left.
Just below the grey boxes at the top, labeled Status, Tools, and Temperature Chart, there is a blank space with a blue box to the right that says "Send"
In that box, you will need to enter:
M303 H0 S60
and click Send. This will run the PID tuning cycle. It may take up to an hour.Once it finishes, you will see an output below it with an M307 line in it, something like:
M307 H0 R0.579 K0.295:0.000 D2.99 E1.35 S1.00 B0
Copy from M307 to the B0 at the end.
On the left, click on System, then click on config.g. This will open the config file for the printer in an editor.
Find the line in the "Heaters" section that starts with M307. Replace that line with the line you copied.
Click Save at the upper right, and it will ask if you want to reload the motherboard or run the config. Either will work to apply the change.Background info:
PID stands for proportional–integral–derivative. It's a control loop that takes into account (in this case) how fast the print bed heats up and cools down, so it can modulate the heating to keep it stable, rather than the 'bang-bang' approach which turns the heat full on or full off. PID tuning lets the system figure out what heating rates to expect instead of the default values that may not apply.
I was having the same issue, my print bed is a 12" x 12" x1/4" aluminum plate, and was heating at about 0.3C/second instead of the 1.7C/sec the system was expecting. -
@techmav thanks for coming back with that recipe for action. it's going to be the first time I edit my config.g file! Mac
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@mac process update: DWC cancelled the process because the temp wasn't reached (in an appropiate time?, DWC didn't say). So, can I S40? Because just before the cancel happened, the bed was as 43.9.
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@rushmere3d did that in a subsequent config.
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@mac said in HotBed Heating Too Slow?:
Ah, what does PID stand for?
proportional–integral–derivative
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@phaedrux there's got to be a joke in that acronym somewhere!
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I thought so too, and I could get close, but never quite reach it.
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@phaedrux I've never meant a proportional integral I didn't find derivative.
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6/23/2022, 3:01:49 PM Warning: Auto tune of heater 0 failed due to bad curve fit (R=0.129 K=2.291:0.000 D=2.92)
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@jay_s_uk well, the tuning failed three times. so I've gone back and changed the profile to PID for the bed, and now we're going to see if that will help it pass DWC's tuning procedures.
