First Layer Issues
So I just bought and assembled the MK3s with the powder coated sheet, did the pre-flight check and did the first layer calibration. I think I have that calibrated ok, but as soon as I try to print any of the test prints on the SD card, they just immediately glob up on the nozzle, no bed adhesion whatsoever. Any thoughts?
Best Answer by bobstro:
Your Live-Z is too high and the filament isn't sticking to the PEI print surface. If you have not already done so, try using Jeff Jordan's "Life Adjust" procedure for calibrating your Live-Z setting. It is much easier to use and understand than the on-board routine. It's much easier to make mid-print adjustments accurately with. In general, start high (less negative) and work lower (more negative) in large increments (e.g. 0.1mm) until the filament starts to stick on its own. When you've got your Live-Z setting adjusted properly, you should be able to gently rub the extruded lines on the PEI surface without dislodging them. Then start lowering (more negative) the level until there are no gaps between layers.
Also, be sure the PEI surface is clean. Prusa (now) recommends using 91%+ isopropyl alcohol to dissolve finger grease and other contaminants. Don't be shy with the volume of alcohol you apply. The effectiveness is directly proportional to the ratio of grease to solvent. The more solvent (isopropyl alchohol) and the greater the strength of that solvent, the more effective it will be for cleaning. Also be sure to wipe away from the print area.
RE: First Layer Issues
Your Live-Z is too high and the filament isn't sticking to the PEI print surface. If you have not already done so, try using Jeff Jordan's "Life Adjust" procedure for calibrating your Live-Z setting. It is much easier to use and understand than the on-board routine. It's much easier to make mid-print adjustments accurately with. In general, start high (less negative) and work lower (more negative) in large increments (e.g. 0.1mm) until the filament starts to stick on its own. When you've got your Live-Z setting adjusted properly, you should be able to gently rub the extruded lines on the PEI surface without dislodging them. Then start lowering (more negative) the level until there are no gaps between layers.
Also, be sure the PEI surface is clean. Prusa (now) recommends using 91%+ isopropyl alcohol to dissolve finger grease and other contaminants. Don't be shy with the volume of alcohol you apply. The effectiveness is directly proportional to the ratio of grease to solvent. The more solvent (isopropyl alchohol) and the greater the strength of that solvent, the more effective it will be for cleaning. Also be sure to wipe away from the print area.
and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: First Layer Issues
Thanks! Using that method was much easier. I seem to be set, printing now 🙂 Thanks again!
RE: First Layer Issues
Thanks! Using that method was much easier. I seem to be set, printing now 🙂 Thanks again!
Have fun with it!
and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan