Multi Color printing one extruder always needs time to heat up.
Hi,
I have just changed from 0.6 nozzles to 0.4 and have therefore just made a few small test prints. I have installed a hardened nozzle in E1, which is why it has a 10 degree higher temperature. So I created a filament profile for this nozzle (you always have to save the profile when you switch back and forth between the individual extruders in the slicer, which is extremely annoying, but that's another topic...)
My test model is quite small, so that one color per layer (three colors in total) only takes a maximum of 5 seconds. Since all three colors are needed all the time, all extruders should actually be kept at a constant temperature, but this is not the case with E1. It has to be heated up before each use, which for this small test print takes just as long as printing the whole layer.During the first test print, I still had the idle temperature activated, both in the filament profile and the ooze prevention in the print profile under multiple extruders. I thought maybe that was the reason. But deactivated it is the same. Why is the temperature not held at E1?
I have attached a 3mf of the model with my settings. Maybe I have overlooked something?
RE: Multi Color printing one extruder always needs time to heat up.
You have to zip the .3mf file before you can upload it.
one color per layer (three colors in total) only takes a maximum of 5 seconds
I suspect you have the same issue that gaaZolee just figured out: https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-general-discussion-announcements-and-releases/xl-waiting-for-temperature-between-tool-changes-too-often/#post-694193
So to get rid of the pausing caused by the cooling threshold just set "Slow down if layer print time is below:" to zero, in Filament Settings > Cooling > Cooling thresholds.
XL-5T, MK3S MMU3 || GUIDE: How to print with multiple-nozzlesizes do read updated replies || PrusaSlicer Fork with multi-nozzlesize freedom || How Feasible is Printing PETG for PLA supports on XL very
RE: Multi Color printing one extruder always needs time to heat up.
Oh right, the file was not attached. I didn't notice this thread.
I have now set "Slow down if layer print time is below" to 0, but this has not changed anything...I had first set it to 3 seconds, then to 0. Then I also set the time of the two extruders which are not used at all to 0, but none of that helped. The temperature of E1 is not held after use, the extruder always has to heat up first.
Attached this time is the 3mf with the current settings.
RE: Multi Color printing one extruder always needs time to heat up.
in the Filament settings you have set an idle temp of 70° for the filament in the first extruder.
RE: Multi Color printing one extruder always needs time to heat up.
in the Filament settings you have set an idle temp of 70° for the filament in the first extruder.
Where? The idle temperature in the filament profile is not activated.
RE: Multi Color printing one extruder always needs time to heat up.
You didnt save the profile with the deactivated idle temp. so when you switch between the different extruders it gets reactivated.
RE: Multi Color printing one extruder always needs time to heat up.
So I printed out some of your uploaded file and watched it. Most of the time it was fine but I did notice a few pauses here and there. A couple times it was for E3, not just E1. I even tried a fresh file with my own settings and just imported the model instead of opening as a project and the result was the same.
I think I only noticed the pauses happening after a tool is used for just around a second or so, like pictured below. Seemed to me like the temperature fluctuations (PID tuning issue?) just couldn't keep up with how quickly the tools needed swapping which makes things pause for a second or two for temps to hit their target. I'd defer to someone with better hardware knowledge before I'd call it a bug, might just be an edgecase.
XL-5T, MK3S MMU3 || GUIDE: How to print with multiple-nozzlesizes do read updated replies || PrusaSlicer Fork with multi-nozzlesize freedom || How Feasible is Printing PETG for PLA supports on XL very
RE: Multi Color printing one extruder always needs time to heat up.
I have now scaled the model larger in X and Y to increase the time per layer. This is now increased from approx. 15 seconds to 40 seconds.
It really seems to me to be a problem with the pid tuning and the NozzleX in E1. As soon as the extruder is parked and the nozzle has contact with the rubber at the bottom, the temperature drops by about 5°C. It takes a moment for the nozzle to heat up again.
However, the pauses due to the increased layer time have become shorter.
I am now wondering, is pid tuning done in any of the calibration programs? There is no dedicated menu option for this.