I'm not using a fan, except for the fan that exhausts from the heat break. There's no cooling fan on when I print at all. Should I not even run the heat break fan?
I'll try the garbage bag trick.
I will add that my extruder has been calibrated such that when asked to extrude 100mm of filament, that's exactly what you get, so there shouldn't be a problem with over/under extrusion. Bed is level as I have been using the TH3D EZABL sensor. I get great skirt, first and second layer, but it seems that layers after 3 or 4 just don't stick at all.
Okay, changed the print speed to 30mm/s for all layers. Layer width is .15. No fan (have never used a fan for Nylon, as that's not recommended by anybody). Hotend temp is 260 C, bed temp is 60 C. Again, no issues with bed adhesion.
Retraction distance is 7mm, retraction speed is 60mm/s, travel speed is 120mm/s. I am not experiencing much stringing, but still have a problem with upper layers delaminating and/or creating the "spaghetti monster". It's as if the filament is getting too cool at the upper layer levels, but indoor temp here is 70 F. Filament feeds directly from the drybox to the extruder, so there's not much exposure to outside air. Filament has been dried in an oven at 160 F for 3 hours prior to being placed in the drybox. Drybox humidity is stable at 20%. I have tried everything that has been suggested by various "experts," and nothing seems to have worked. The only other thing I haven't tried is putting the printer in an enclosure, which is not feasible at this time.
Can someone recommend slicer settings that might solve this problem?
mpirringer: Thanks for the input. I have dried the filament in an oven at 160° F for 3 hours, put it in an airtight box with dessicant, humidity is stable in the box at 20%. I have a TH3D "tough" hotend that has no issues with 260 C. I don't have any issues with bed adhesion; I use PVA glue and a glass bed at 60 C. I will try slowing down the speed, but it's not fast now. The 120mm/s is travel speed to try to avoid stringing. Lately I have not had the stringing issue; it's just layer adhesion above the 4th or 5th layer. I get very good 1st layer and 2-3, so I'm wondering if it's just the print speed that's an issue.
This may have been covered elsewhere, but after searching, I've not found an answer.
I have been trying to print with Matterhackers 1.75 PRO Series Nylon (black), and have yet to produce a completely satisfactory print on my Creality Ender 3. At first, the main problem was significant "stringing," so I have been tweaking my slicer (Cura) settings to try to eliminate that issue. I have now apparently eliminated (for the most part) the excessive "stringing" by upping the retraction distance to 7mm, opting for a Z hop, setting travel speed to 120mm/s. The bed is level, using TH3D EZABL, I've calibrated my extruder e-steps to insure that extrusion is accurate, bed heat is 60° C, and hotend temp is 260° C.
Now, I get a great first layer, seemingly no issues with layers 2 and 3, but by layer 4, I start getting the "spaghetti monster" and the layer appears to be delaminating significantly.
What can I do to alleviate this situation? I spent $55 for what has essentially been a great headache. I have had no issues printing with PLA. I dried the nylon in an oven per Matterhackers directions, the filament is stored in a drybox at 20% humidity. What's going wrong?
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