Hi, I've had my printer for about a 2 months now (Ender 3). Oh yes, I know this is an ultimaker form but I sadly can't afford one. I do use cura so I decided to post here. Anyway I've had issues with these odd z layer lines on my prints they always occur at the same place.
Image: https://imgur.com/a/EHHjSNB
Things I've done so far:
1. I checked to see if my 8mm threaded z axis rod was bent. I sat it on a table and it was every so slightly bent, maybe .07 mm of bend. I find it hard to believe that that could actually cause my issue.
2. I've checked the alignment of my z stepper with the cuppler and rod. No issues there they rod slides in and out with ease when screws are loosened.
3. I checked the alignment of my frame on my machine. Everything is square within .1 of a mm. All screws are tight too.
4. I checked the belts on the x and y axis of the printer. Both are very tight and make a medium pitch sound when plucked like a guitar.
5. I checked my rollers and all rollers are tight but not too tight. I can still manually spin them with my hands.
6. I've checked the tension on the z 8mm threaded rod, the screws are snug but not all the way tightened down.
7. I've tried printing with heat off incase my of any bed heating issues, very minimul improvement.
Other info: My z 8mm threaded rod is free floating and does not have a bearing at the top. My only other mods I did was add a bltouch and a 5015 petsfang. I print on glass at 210 degrees for pla.
Going back to the z 8mm threaded rod as an ending note here. If I disconnect the z stepper cable and push the x carriage down really fast, I do notice that the top of the z rod wobbles just a little bit.
I think I've tried everything here, that's why I'm posting. Could that .07 mm bend in my z rod actually cause the issue I'm seeing. Is that slight wobble actually my issue. If so where could I buy a rod that would be 100% straight unlike the one I have?
If I forgot anything please let me know also sorry for any typos or errors.
Thanks .