Top Layer issues

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Top Layer issues

Postby Alghoul » 2016-Dec-Mon-16-Dec

Hello all! Im posting here as a last resort, i've tried everything I can possibly think of to correct this problem to no avail. My problem is the top layer of my prints are super jagged and downright unfriendly on the eyes.

Solutions that i've tried:

Adding more top layers, increasing infill, different combinations of infill/top & bottom patterns, Increasing & decreasing Printing speeds/printing temps/ extrusion multiplier, calibrating my first layer, and experimenting with different cooling settings.

My filament has been stored correctly, no bubbles or other defects. First layers seems good and infill prints nicely. Top layer can't be achieved :(

Printrbot simple metal, upgraded heated bed (10" platform) printing Abs, used with a heated build chamber. Any suggestions are welcome! I'd really appreciate it!

Pictures are of bottom and top layers. Can't afford to waste anymore material trying to troubleshoot, been using this setup for about a year and a half, never had this issue prior to about a month ago.
IMG_1773.JPG
IMG_1772.JPG
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Top Layer issues

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Re: Top Layer issues

Postby RetireeJay » 2016-Dec-Mon-17-Dec

The first picture looks like you have under-extrusion; the second looks like you have over-extrusion.

I'd suggest carefully calibrating:
1) Start with the printhead some distance above the bed, so there's room for plastic to flow without blocking the nozzle. Hold the filament above the extruder straight up and using a ruler, put a mark on the filament 100mm above the extruder. Then issue "manual" extrude commands to extrude a total of at least 30, preferably 50mm of filament. If the distance that the mark moved is not exactly what you have commanded, then your Extruder calibration in steps per millimeter needs to be adjusted. For example, if your mark moved 40mm when you asked for 50, then you know you need more steps in order to extrude more material. Using an M503 command, you can find out what Extruder calibration factor is currently in use (in the M92 section). In the hypothetical example here, take whatever that number is and multiply it by (50/40). Then issue an M92 command to change the value in use. Try running the check again. If you get the right amount of material extruded, then issue an M500 command to save the correct calibration value to EEPROM so it will be the default every time you turn on the printer.

2) Use a digital micrometer to carefully measure the actual diameter of your filament. The filament will generally be oval, so find the highest "diameter" and the lowest "diameter" and take the average. Use this number in your slicer for your filament diameter.

3) If you have done the above two steps, your extrusion should be very close to correct. Set your Extrusion Multiplier to 1.0. Try a small print and see how it looks. If you believe it needs more adjustment, you can tweak the Extrusion Multiplier - but use small increments when you change it, like going to 1.05 or 0.95.
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Re: Top Layer issues

Postby Alghoul » 2016-Dec-Mon-18-Dec

Thank you! I will give that a whirl!
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Re: Top Layer issues

Postby Mooselake » 2016-Dec-Mon-22-Dec

Having the first layer start too far off the print surface can cause it to be underextruded. In the probing bots you adjust this with the z offset, in 0.1 mm or smaller increments. Being of the probing is best left to aliens persuasion somebody else will need to comment on whether you need to increase or decrease the number

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