Test print doesn't print straight lines
Hello, I'm at the end of my filament trying to solve this one. I have updated the firmware, calibrated countless times, cleaned the bed, adjusted the Z height, and changed the filament including using prusa brand filament.
Could someone please advise as to what might be the issue or what I could try next?
RE: Test print doesn't print straight lines
I'm still working on this, still having trouble. Can anyone help?
RE:
it looks like your extruder is still too high.
I think the First layer calibration tool that Prusa include in the LCD Menu, can be difficult to grasp at times.
there are a number of alternative aids, the one I find easiest to locate is memorable, because of a spelling mistake
It is 'Life Adjust Z My Way' by Jeff Jordan.
there are test G codes at the bottom of the first post. see the link below. (Please note, these Gcodes are based on a 0.4mm nozzle)
I have added images to help you understand how much difference small changes in Live Z, can make as you approach the ideal setting.
Please note, the 'Actual best live Z setting' is unique to every printer so the values below are purely indicative on my settings, on my printer, on the day I did the print.
Changing the build plate type, is enough to mess up, your live Z setting, for example a smooth PEI build plate, is likely to hade a smaller negative live Z value than a Powder coated build plate (because the smooth PEI sticker has a double sided adhesive sticker between the PEI and the steel core of the build plate which is thicker than the powder coat on the other type of build plate.
During mesh bed levelling, The Pinda probe cannot sense the surface material, it can only sense the steel plate, Basic assembly processes set the extruder, safely higher than the ideal print height, Live Z then causes the extruder to be moved lower, to achieve the ideal print height, where the ammount of filament extruded in the first layer, is squished enough, to form a smooth layer between the extruder tip, and the build plate surface. this is why Live Z should always be a negative number on a Prusa Mini, mk2 or a mk3 series printer (Note Later printers use a strain gauge instead of a Pinda, and the process is different)
I believe, in your case, live 'Z' is too high (too small a negative number), preventing the filament from sticking to the print bed, properly (no squish / insufficient Squish)
Please be aware that Live Z should be less than -2.00 millimetres, if your live Z is approaching 2.00 milimeters, I would suggest resetting live Z to 0.000 millimetres, and re adjusting the pinda probe, relative to the extruder, then re adjusting live Z, otherwise you risk the nozzle colliding with the printed model, if there is any warping as the model progresses.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK
Agreed, your first layer Z offset is far too high.
At the end of the built-in zig-zag calibration you are aiming to print a single layer postage stamp sized *sheet*. It should be possible to peel it off in one and fold it without the threads separating. If it breaks into lines it is too high, not squished enough. If it is a single sheet but with wavy lines or drag marks on it you are too low.
best live Z setting' is unique to every printer
...and will change, slowly, as the nozzle wears. Expect to recalibrate every few months until you wear-out and replace the nozzle when, of course, you recalibrate and start again.
Cheerio,
RE: Test print doesn't print straight lines
The website is not letting me respond to this thread. Testing
RE: Test print doesn't print straight lines
This is currently set to -0.245mm. This seems to be in line with the recommendation to be around -2 mm. It looks like garbage.
At this point, do you think it's the probe? Can you please direct me to another adjustment instruction if the z leveling isn't it?
RE: Test print doesn't print straight lines
Your LiveZ setting is too high,
Try lowering it
Try this Process
https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/
test files in the bottom of the first post
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK