as you can see from the photo there are missing spots on the final layer, any ideas, using an ultimaker 2, funny thing is i use a different roll earlier without having these issues
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That appears to be the extruder motor either slipping or skipping. Probably you need to either increase extruder temperature or decrease print speed. Or maybe adjust the extruder tension (either more or less tension might be needed).
looks like under-extrusion
i tried the temperature increase and the slowing of the print speed still did it, what now?
how do i fix under-extrusion?
here are other photos
Keep increasing temperature and keep decreasing speed until it works. Try other filament and see if it’s a problem with colorfabb’s pla.
fyi i was printing for almost a week straight with no issues before this started, does it maintenance?
how much does humidity play a factor? it’s very humid here
That could be an issue, PLA is susceptible to humidity. You might try drying out the spool and see if that changes anything. Also you can try opening the extruder housing on the back and see if that needs cleaning, sometimes bits of plastic get ground up in there and clog up the extruder gear making it slip.
Check the filament diameter. It should be around 2.85 and definitely under 3.0.
How many print hours are you up to with your printer? Have you ever changed the white teflon insulator (white thing above the nozzle)? The Ultimaker 2 from Q1-Q2 2014 had Insulator that started deforming between 300-600 print hours. Newer ones have better durability but still deform over time.
Some Colorfabb variants have slightly higher flow rate than others, try increase the flow by 5 percent. If not then you have back pressure in the nozzle caused by printing the top layer too fast, lower the speed and you should be fine. Print a few calibration cubes with that filament to dial in the settings.
I see that the other layers looks nice. It is strange that it is only the final layer that causing problems.
I dont think there is anything wrong withe your printer or filament.
To me it looks like at Gcode problem. Do you have any plugins enabled?
HI,
for me it looks like an extrusion problem
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So the printer always get extrusion problems with the final layer? that sounds very strange!
Hi ikymagoo, my suggestion is to change the temperature from the standard 210 degrees C. to 220 C. Sometimes this produces good print results on my Ultimaker2, even if the official Colorfabb advise is to print it in a temperature range from 190 C. to 210 C.
Please let me know if my advice produces good results on your printer too!
Ronald
tried this came issue, does it on Colorfabb Red and on Ultimaker sky blue.
here are 2 photos, the smooth one i did last week, no problems, same colorfabb intense green, but different roll,
the other one is what is printing now, i noticed the first 2 layers of top infill are not spanning the 25% infill lines
this one was done with temp at 225 and i slowed the speed down to 70%
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644 hours, original white teflon insulator, the machine was bought in January 2015
