Lines in print on textured bed in various locations
hi guys - does anyone know why this is happening? Is it a calibration issue - I find it odd that it is only on this side of the print. In the pics you can see the layer is rough in that area and underneath as it is printing the first few layers (the top) and then on the top you can see the lines - I looked at the process as it was layering the filament - I did no see the head dragging itself on the bed/ print.
attached pic prusa3.jpg
Thanks for your help.
RE: Lines in print on textured bed in various locations
That's a pretty typical result due to your Live-Z being too low (too negative). I'd try raising it (making it less negative) by 0.06mm, then adjusting it by 0.02mm increments up and down until your 1st layer is smooth.
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 onboard routine and 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. You should not be able to peel the lines apart after printing, but the top should be regular.
If you still have issues getting it even across the entire print, be sure you've enabled 7x7 mesh bed leveling. It is much more accurate than the 3x3 default. If you still have issues across the bed, you might have bed issues, but I would not be alarmed based on that picture. Sometimes the distortion builds up as the layer is printed and one side looks worse.
If you want to do more testing of the entire bed, I've got some test prints here that you might find useful.
RE: Lines in print on textured bed in various locations
Wow thanks for this awesome detailed information - I will absorb all this and put it to practice - I will report back on the results!
RE: Lines in print on textured bed in various locations
So far so good - (see better.jpg) I have 2 MK3S printers and I just re-ran calibration AND I exported new g-code for both of them - it seems in the older gcode - I had the first layer and all other layers set to at 220 hot end and 65 bed instead of the default of 215 and 60. This time I left the default and as the pic shows - it looks so much better. I will update with a completed pic once done. It is possible that the extra first layer head and the need to re calibrate could be ins the culprit. I think you should re-calibrate every so often - just not sure of what the parameters in terms of after X number of printer / hours used - run a re-calibration. I am sure it is documented - just overlooked. Thanks again - see you back here in about 5 hours.
RE: Lines in print on textured bed in various locations
It worked well - so it was calibration settings, live - Z, temps - all fixed!
RE: Lines in print on textured bed in various locations
@mgtarallo
you should re-calibrate every so often - just not sure of what the parameters in terms of after X number of printer / hours used
Get into the habit of watching the start of every print and at least checking the first layer is OK before it starts the second layer. You will spot problems early including the need for recalibration.
Cheerio,