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  1. jens55 27 Jun 2020, 18:26 I am experimenting with dual material printing. I find that I have a lot of oozing during extruder switching due to a significant temperature difference between standby and active mode. I had anticipated to compensate for this by using the Cura feature "nozzle switch extra prime amount". After waaaay too much screwing around, I seem to have determined that this feature is only available if you use a prime tower (no mention of this in the little help text and the feature is not grayed out when no prime tower is selected). Is there a magic incantation that makes the extra prime amount feature available without having to enable the prime tower? Using a prime tower wastes a lot of material and also causes excessive switching of extruders (every second layer) which causes things to slow down drastically.
  2. Cura has an entry for heat up and cool down times for each extruder. I am still messing with those and they seem to be inconsistent to my way of thinking about these parameters but they might work for you. In my way of thinking, the heat up parameters in degrees/sec is exactly what you want but I suspect that Cura's implementation of this is not complete or is not working correctly or I misunderstand it's intent. In my way of thinking Cura says 'I will need the next extruder soon and based on how fast it heats up, I need to do so at x time'. The idea being that the new extruder is at temperature when it is needed.
  3. When I do a two colour print in cura and switch to a different extruder, cura powers up the newly chosen nozzle and waits until it has reached operating temperature before it continues. Cura does not however start dropping the temperature of the now unused nozzle to it's standby temperature until the new extruder is at temperature. It seems that the command to drop the current temperature is executed after the command to bring the new extruder up to temperature. The result is that the now inactive but still at temperature nozzle gets dragged over the model and contaminates the print. Is there a trick to get Cura to allow cooldown of one nozzle while the second one heats up ? Of course it would be ideal if Cura could heat up one nozzle, cool down the other nozzle at the same time and wait until both nozzles have reached there commanded temperatures.
  4. I am trying to sort out dual filament printing. For reasons that are a mystery to me, no matter what I do and what settings are, the printer will always prime the first extruder even though no material will be printed for several layers. The sequence will be as follows: Extruder 2 is heated to operating temperature, Extruder 1 is heated to standby temperature. The printer then prints brims (if configured) for the model (in this case overridden to extruder2), prints the brim of the prime tower even though it is specifically not configured. (this also prints with extruder 2). After that, the bottom of the model is printed (with extruder 2). So far, everything is as expected (other than that the brim for the tower was specifically left unchecked). Next, Cura heats up extruder 1 (nothing is supposed to be printed with extruder 1 for a while) and proceeds to print a line around the outside of both brims. Then, it fills the prime tower bottom with extruder 1. All of this extruder one stuff produces contamination of the print that is actually meant to print 😞 In addition, extruder 1 starts to heat up at the very beginning of the bottom layer of the model which results in a fully heated extruder 1 which drools all over the material that was printed with extruder 2. Also of note, I have tried adjusting the heat up and cool down settings for the extruders but that seems to not affect the first layer at all and subsequent layers either start heating at the beginning of the previous layer or at the end of the current layer. I was trying to start the heatup just prior to the layer finishing so the next extruder is heated up just in time for when it is needed but not before (in which case it drools on the previous layer) So, am I missing something here or is the dual extrusion 'smarts' not fully developed in Cura 4.4.1 yet ?
  5. In the past, the setting search box was not too helpful when searching for a word that wasn't the first and I got into the habit of not using the search function. Mind you, in this case I would likely have searched for 'support' and I should have found it. Senility is setting in 😞 Enabled the option and voila ... it's implemented rather odd in that it doesn't do a brim around the individual support lines but the net outcome of better adhesion is the same.
  6. CRAP !!!! I spent forever (well maybe an hour) searching for that option but just couldn't find it! I did look in the settings visibility too, honest 😞 Thank you VERY much. I am making an eye doctor appointment on Monday !
  7. Is there any way to generate a brim for support lines ? When you get very low support percentage the individual lines tend to lift and it would be nice if there was a way to increase the adhesion to the build plate.
  8. Printed with 30 mm/sec all around. Just to clarify, the sequence is : Print inner wall on previous layer increase layer print 'defective' infill line on current layer print a bunch of perfect infill lines print one infill line intersecting the defective line that just barely touches the wall layer (once it gets printed) Print outer wall print inner wall repeat. With the new settings, the 'defective' line now juuuust touches the wall in one out of 3 layers Only the infill line immediately next to the defective infill line shows a reduced overlap (maybe 10%), all other infill lines show the requested 100% overlap between infill and wall. Running the file on a simulator show the end points of the infill lines to be between the inner and outer wall, just as would be expected. There is a definite lag on the defective inlill line for the filament to flow but there is also a noticeable (but not as big) lag on the infill/wall joint next to the dud joint.
  9. Outer wall speed is 20, inner wall speed is 40, infill speed is 10
  10. Turns out it is indeed the first move after the wall but reducing the speed by a factor of 3 did not change the outcome by a bit.
  11. The speeds have already been drastically reduced to avoid just that possibility. I have reduced the infill speed to 10 mm/sec and will do a test print.
  12. ... as requested CFFFP_duet roof molding sample.3mf
  13. combing is off. Would you like me to post the entire file?
  14. The gcode that does layers 4 and 5 .... layer4and5.gcode
  15. Gone to 100% infill overlap, added 1 mm3 of extra prime just for the heck of it and this is the result: In this print, all but one of the infill lines meet the wall. The joint that doesn't meet the wall appears to show the extra prime amount as a bit of a ball at the beginning of the infill line which is well away from the wall. The wall/infill joint right next to it shows the infill barely touching the wall in spite of the setting of 100% overlap
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