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Everything posted by jens3

  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 incanta
  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
  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.
  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, th
  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 sho
  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
  16. Bowden tube has been replaced, couplers have been replaced, pressure advance has been re-calibrated and speeds have been reduced in case I got into volumetric limits of the Volcano hot end. On things like walls, I can see extrusion of material the instant the nozzle starts moving. While the 'starting' gap with infill has reduced with all the improvements, there is still a noticeable delay when doing infill between when the nozzle starts moving and when material is extruded. The nozzle is always moving as it should starting from the wall with the core issue being a delay between movem
  17. The gcode (as per cura preview) does not show any issues. I have done a bunch more testing and I need to follow up on two items - I have a considerable amount of play between the bowden tube and the bowden coupler with the tube sliding in and out during retraction moves and I also need to re-calibrate the pressure advance setting. I will run another test print after this is done and post a follow-up tomorrow.
  18. I have run into an issue where infill lines in Cura 4.3 do not always go back to the wall surfaces. I have tried different infill patterns and this issue is present on all of them. I am printing 1 mm wide and 0.4 mm high at up to 60 mm/sec with a Volcano hot end. I am using a Duet wifi controller and have tried a variety of settings for pressure advance as there is a very long bowden tube. From all my testing, I am pretty certain that the issue is not related to pressure advance which was my first guess. What happens is that the infill line is started and there is a distinc
  19. Well hot-damn ... I like it.... thank you very much for posting the idea about the template. It works a treat ! The only down side of doing it this way is that if I revise the model I have to place the corner templates on every revision. Hopefully that will become very easy with practice.
  20. Hmmm, interesting .... I will have to try that ot to see how that works. Thanks !
  21. I call that a 'mickey mouse ear' and yes, I end up designing this into the model at the CAD level. What do you mean by 'circular template'? Your choice of the word 'template' seems to open up the possibility of some sort of fixed thing that you can just drop over the model rather than designing the circle into the CAD model ?
  22. That was what I was afraid of but had to verify ... oh well, life goes on. Thanks !
  23. Is there any way to make a brim two layers tall rather than just a single layer ? I find that when a model really wants to curl up, the brim separates right at the base of the model. A second layer of brim material would strengthen that junction. I have been designing my own brim in the model design phase but it would be nice if I could just make a brim two (or even three) layers tall
  24. This is on an Ubuntu machine. On initial install, Cura 4.4 seemed to work fine but at one point I switched between two machines I have configured and Cura crashed. Ever since then, I can't start up 4.4 at all. Possibly there was something in the machine profile that Cura 4.4 didn't like but of course it tries to start up with the same machine settings that crashed it in the first place. Both machine settings work under Cura 4.3
  25. I am running Cura 4.3 on a two extruder machine. Extruder 1 is used for the model, extruder 2 is used for support. I am trying to change the support interface pattern. If zig zag is selected, rather than the normal 45 degree pattern I get from every other zig zag selection, the pattern is 90 degree rotated (or an additional 45 degrees). Is there a setting someplace that I am not aware of that regulates the angle used in zig zag patterns ? The zig zag angle also doesn't seem to alternate orientation like it does on any other zig zag pattern. What am I missing ?
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