Hello All,
I can’t seem to figure out what’s going on with my hot end dropping in temperature.
First off, I checked the thermistor and it is working fine. I ran a PID calibration and that didn’t work.
I tested the heater and it’s working fine.
I start a print and about 5 or 10 minutes into it the temperature starts to slowly drop. If I pause the print, the temp goes back up to where it’s supposed to be. i can leave it paused for an hour and the temp never varies but when I hit resume, the temp will start to drop again. Can someone help me out please,
Thanks
Rob
What is the temperature that you start at and what are you printing?
It sounds like your cooling fan is kicking on and causing the temp to drop.
I’m using PLA and printing at 205. The temp has dropped to 180 before having to stop it. The cooling fans even on high never change the Temperature like that.
Thanks for responding!
It’s typical for the part cooling fan to stay off for the first few layers, so the part cooling fan hitting the nozzle would align with the 5-10 minutes you’re seeing before the drop if you’re doing smaller prints.
Depending on the shape of what you’re printing, there could be some part cooling air reflecting back upward toward the nozzle, also cooling it off.
What toolhead and printer are you using? I had issues with the stock SE 0.5 design, and ended up moving to the itworks3d style with a new duct. It reuses the parts from the SE 0.5, but has a better part cooling duct.
The Titan Aero mount from itworks3d is here:
And the duct I use is here. It’s good whether you use the BLTouch with it or not.
https://www.printables.com/model/34295-itworks3d-bl-touch-fan-duct
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I’m using the V3 dual extruder tool head. I have printed this same part 6 times with no problems. I’m going to shut off all nozzle cooling fans and see if it helps but still, I have printed this part before using same program and setup.
Thanks for the reply!
How old is the Tool Head?
Do you know if it has the 30w heater cartridges? If so, I would definitely upgrade those to 40w ones. They are able to maintain heat better.
Otherwise, turning your cooling fan down to like 20% should help with this.
3 Likes
Are you using the same GCODE as before, or did you re-slice for this print?
I’m using the same code.
Thanks for the response!
You were right on. I’m not sure why because I have run the program before with success, but i turned down the nozzle fans and the problem stopped. Thanks for the suggestion!
Try about 5 or 10 Celsius hotter