#Hotbed temperature graph is a rollercoaster

1 messages · Page 1 of 1 (latest)

twin arch
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Randomly started happening today, no idea how to fix it, the printer is a Neptune 4 Plus i got november 15th and that has 294h total time and 283h print time

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fossil lanceBOT
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AI Help

It would be helpful if you could provide more details about the issue you're experiencing with your Neptune 4 Plus 3D printer. Without specific information, it's challenging to provide targeted troubleshooting steps. However, you can try the following general troubleshooting tips:

  1. Check the filament: Ensure that the filament is loaded correctly and isn't tangled or stuck.
  2. Clean the nozzle: If you're experiencing print quality issues, it might be due to a clogged or dirty nozzle. Clean it using a nozzle cleaning tool.
  3. Check the bed leveling: Make sure your print bed is properly leveled to ensure adhesion.
  4. Update firmware: Check if there are any firmware updates available for your printer and install them if needed.
  5. Inspect the extruder: Check if the extruder assembly is functioning correctly and nothing is obstructing the filament path.

If the problem persists, consider reaching out to the manufacturer or an experienced technician for further assistance.

WARNING: This response is AI generated and may contain errors.
twin arch
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Neptune 4 Plus
no mods
klipper
last print was elegoo pla at 200c and 60c hotbed 5 hours ago but i didn't check the graphs then
i haven't tried anything so far because i don't know what i could do

fossil lanceBOT
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twin arch
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it doesn't fluctuate while it's not heating

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so i'm confused

oblique ruin
twin arch
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i don't know what i would look for, it looks fine otherwise

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nothing else is turned on, but it's worked fine for a couple months so i don't know why it would now

oblique ruin
twin arch
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i checked and none seem like they're loose

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the other half of the cables are going under the foam which is glued

oblique ruin
twin arch
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the bed's maximum temp is 100 but the hottest ive had it be was 80, and usually 60

IMG_20250126_031051467.jpg
oblique ruin
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It only fluctuates on heat up?

twin arch
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i think, i haven't tried leaving it on because i got too worried

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when heating up and very slightly when cooling down

oblique ruin
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Thats fair....
If you do it while you are sitting there you can at least turn it off if you smell or hear weirdness.
Don't leave it unspuervised if u are testing it.

Do u put the foam on the bed?
Is there more wire under that foam...? What the insulation on them look like?

twin arch
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the foam insulation thing was there from factory, it's around a centimetres thick and glued to the bed, the thin wires go under it, and they look similar to the ones i posted but they're colourful

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just tested while supervising, didn't smell hear or see anything odd, and it still fluctuates while hot

Screenshot_20250126-032617.png
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the temperature i felt with my hand was roughly the same as normal, but idk why it's so inaccurate randomly

oblique ruin
twin arch
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from what i can tell id have to rip off the foam i think?

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they go somewhere under it

oblique ruin
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🤔 yeah dont do that yet then...

twin arch
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it doesn't seem to be under warranty so ill have to fix it myself too

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when it's under around 40c or 35c it seems to be normal

oblique ruin
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It just happens as the amp draw increases.
(Higher temp = more power usage)

oblique ruin
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Idk if it's normal for that to happen btw.

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I was looking through this to get a better look at the bed...

https://m.youtube.com/watch?v=sgqnlR9Wlk4

YouTube
Engineerable
How To FIX ELEGOO NEPTUNE 4 PRO BUILD PLATE WARPING to improve bed ...

There's a design flaw hidden under the ELEGOO NEPTUNE 4 PRO build plate. The Y-axis belt ends stick up into the foam insulation and heater under the bed. This constant pressure can cause the bed to warp. Overtightening [accidentally] the bed using the bed leveling screws will apply more pressure and definitely cause the bed to warp. This video s...

▶ Play video
lavish hornet
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Fluctuation could also be caused by PID tuning not being done for the specific use case

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Such as tuning it with fans off

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Then heating with fans on

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Though that fluctuation does seem rather extremes

fossil lanceBOT
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open folio
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could be the temp sensor loosing physical contact to the bed, the spikes ramping down slower than up which would make sense to me in that case. also for longer tests, which are dangerous (good call on approaching it with caution), you could put some wet tissue on the bed and abort when you sense boiling/steam

fossil lanceBOT
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oblique ruin
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@twin arch there has been some other great suggestions (see above)

twin arch
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sorry i fell asleep as it was 4 then i was too busy

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so what should i do?

oblique ruin
# twin arch so what should i do?

@open folio @lavish hornet do u guys want to run them through how to do pid tuning for bed and check the thermistor is loose?
(Note: pls remember to ping)

twin arch
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i looked online how to do it and it's simple enough for me to understand, but i don't know if it's a hardware or a software issue

oblique ruin
twin arch
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searching online for it is a bit of a pain because everything that shows up is about the hot end instead of the bed

oblique ruin
fossil lanceBOT
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twin arch
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i did a pid tune and then a test print and it seems like it's mostly fine?

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compared to the hot end

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oblique ruin
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Nice!!
That looks tons better!

I wonder why it changed originally so suddenly? 🤔

twin arch
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it still has these stutters while heating up and cooling down but they're not as severe anymore, and it can keep the same temperature consistently

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might need a tech priest

oblique ruin
twin arch
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i did a really stupid test to try and see where it is by shining my insanely high powered flashlight on the bed and i found that the temperature rises the fastest while i'm shining it in the exact middle of the bed, so it's probably there

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i'll take the bed off when i'm motivated enough and see if i can find anything

oblique ruin
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Stupid? No bro that high level clever!!
Great idea!!

It also shows thermistor still works.. 🙂

fossil lanceBOT
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twin arch
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i don't know what's wrong with it anymore

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while heating up it still has the jitters but once it gets to 60c, it's +- 0.2 degrees

next lake
fossil lanceBOT
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twin arch
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?solved