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Kumpu

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  • Field of Work
    R&D / Exploration
  • Country
    DE
  • 3D printer
    Other
  1. Hi, I just wanted to come back and tell you that it's fixed now. I printed new ducts which made it much better, where before it was up to 15-20° C drop at maybe 50-60% fan speed, with the new part it's more like 8-10° drop at 100% and fast recovery. Then I also did the PID tuning (at 50% fan speed), it overshoots more and oscillates a bit with no fans, but recovery is in a matter of seconds, drop is reduced and with fans on it's very stable. So all in all a good result. Thank you for your help.
  2. Yes, the fans blast the nozzle dead on. Iirc I made it so the middle of the air stream would more or less hit the end of it, thinking that'd give me best performance or something... To my defense I can say this was one of my very first projects, never did CAD before and I just wanted something that worked.
  3. No idea how I'd graph my temperature, I don't use octoprint or anything. Can marlin log that on the sd card? In any case, the heater can definitely keep up if the fan curve isn't too agressive. It's just on small prints that this happens, as layer times shrink and therefore "Regular Fan Speed at Layer" results in a steeper fan curve over time. I saw temps drop by almost 20° C and I think at that point that's fair for marlin to step in. Sometimes when I forget to increase that setting I sit there and dial back the fans manually to help things out. Annoying. PID tuning should help a lot, I mean if it cranked up the power more quickly it wouldn't be an issue. Well I guess except if it's close to the power limit anyway. I'll redesign my ducts and I expect that to fix my problems. But if not I'll look into PID tuning as you suggested.
  4. I guess you're right, I didn't pay much attention to that when designing the fan ducts. Definitely room for improvement there. During the first layer the fans are off, but soon after layer 2 starts and the fans begin blasting, I get that error. Should I change the first two constants you mentioned then? Also I'm a bit unsure about messing with marlin. I only flashed it once for reasons I don't remember but I know that the usb connection was very unstable, and I was glad it even worked and didn't brick my board or anything. I mean if that's what I have to do I'll give it a go but I still think it would be a good feature for cura to have.
  5. Right now you can set a layer/height for this, but I would like to be able to set a time. Marlin will hault my printer with a thermal runaway error when the fans ramp up too quickly, because obviously the nozzle gets cooled as well. So having a fixed ramp up time option would make a lot of sense to me. Each print/settings change has different layer times and I have to decide everytime if setting it to layer n is slow enough. I'm not sure if gcode allows you to measure time, but it wouldn't have to be that accurate - repeatability is way more important. I just want to be able to find a value that will work reliably.
  6. Oh, that's awesome. Thanks for letting me know.
  7. Before printing I like to go into layer mode and check changes in important areas from one layer to the next. For example when supports meet overhangs. Doing this with the slider is a bit tedious, there can be hundreds of layers and you have to move the mouse pixel-perfect to change it by exactly one layer. Typing the number slows you down even more. So my request is to add +/- buttons to increment/decrement the current layer. Here is a quick mockup: Notice that they should be fixed so that you can leave the mouse pointer in place. You could also make it so that a right-click on plus decrements, even faster workflow. Also - I want to thank you for providing this amazing software for free.
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