I’m a noob at 3D printing— I got my Ender3 S1 a little under a month ago. I’ve had great success on multiple prints using mostly default settings, up until last week. I had adhesion problems and was told it was likely my nozzle. I tried a spare nozzle and my next two prints were perfect. Since then I’ve had nothing but messy, blobby unsuccessful prints. More concerning, the prints are sticking to the bed so badly that all I can do is brutally scrape the PLA off. I’ve tried using iso alcohol but it doesn’t make much of a difference. I’ve heard acetone can damage the bed, and I don’t want to make it worse if it’s salvageable.
- Is my bed cover completely ruined?
- What should I do to prevent this in the future?
Thanks in advance. This is my first post on Lemmy and it’s exciting to see how quickly this community is growing!
200°/60°, and my Z offset is -2.71. Is this the same as first layer height?
Try printing a 1 layer thick print to work out the Z offset
For example in Cura I’ll import a cube, the scale it to be X: 40mm Y: 40mm Z: .25mm
Set your initial layer flow to something like 105%
Give that a print and see how the gaps line up.
What you’re going for is what can be seen here in the Example section from the great Ellis’s tuning site (I highly recommend checking it out as you get more comfortable since it may be a little too in-depth if you’re just starting)
https://ellis3dp.com/Print-Tuning-Guide/articles/first_layer_squish.html
You want just enough “squish” that the each layer lines are touching to bond but not so much that it has to be pushed up and around the nozzle.
Basically you’ll print that, and the back the nozzle away from the bed until you get the right spot.
Get that right and you’ll find it gets easier to get successful prints
Thank you! This is exactly what I needed. I’ve ordered a replacement surface and I will go through this all on the weekend.
I really appreciate you taking the time to help. Cheers!
It may be scuffed but you can try and clean it up.
Worst case you figure out how to get the nozzle just right on an unaffected piece before you get the new surface.
You’ll have to slightly adjust the offset anyway since the new surface won’t be exactly the same but you can get much closer to it being right.
And, worst case, err on the side of being too far and down dial it in closer
This is what I was thinking too. It is so stuck it will take a couple hours to get it all off, but at least I can test with it.
One thing that worries me is that I had so many successful prints with exactly the same settings and filament I don’t know how it got this bad. I’m hoping I can prevent the same mistakes next time so I don’t ruin another surface.
Wouldn’t hurt to check that the bed springs are not loose, belts have good tension, etc.
But unless it’s really bad I bet your print surface is usable.
FYI, your Z-offset is really meaningless here. You have to calibrate the gap between your nozzle and bed, and you have to calibrate that for all four corners of the bed to be identical. THEN you have to determine if your bed is truly flat or if the center of the bed is higher/lower than the corners. And before starting any of that calibration, you need to make sure the springs under all four corners are tight (usually within 1 turn of completely closed) and then adjust your Z switch to match that position, otherwise you'll be re-leveling your bed after every few prints. (It occurs to me your machine may not actually HAVE a Z switch, but you still want the springs compressed pretty tightly.)
Yes yes, you have auto bed leveling built into your printer. Sorry to tell you, that doesn't really mean anything except you have to wait for it to calibrate before every print, when if you just learn to calibrate it manually then you shouldn't have to touch it again except maybe checking it every 6-12 months. In reality an ABL can only compensate so much, and if your bed isn't level to begin with then the ABL calibration will cause your printer to be constantly adjusting the Z axis for each layer and your prints won't be as smooth as they could be, and might not even be as strong. You want the bed to be level with the printer frame so that ideally the Z axis should never have to adjust when printing each layer.
As for your goal in the nozzle gap... If your first layer is 0.20mm thick then you want a little squish, so you're probably going to be shooting for around 0.15mm of actual gap. This is where a set of digital calipers comes in handy. Find one of the many first-layer test prints and give that a run (you probably need to find out how to disable your ABL for this). After it prints, you should have five small circles or squares in the corners and center. Measure the thickness of each, and look closely at them. Notice the individual strands of filament running through each piece. Can you see gaps between these strands? Can you pull it apart in your fingers? Then your nozzle gap is too large and the nozzle should be closer to the bed. Alternatively, is the piece solid, but very rough on the top? If so, your nozzle is likely too close to the bed. Your goal here is to get test prints that are smooth on top but will not come apart. When you have manually calibrated your bed leveling correctly, the ABL should calculate a Z offset of nearly zero.
My quick estimate of what is causing problems with your prints sticking so badly to the bed -- The nozzle is way too close to the bed, so close that the ABL cannot compensate, and the heat is literally fusing the filament with the bed. I can also see where you've had to scrape previous prints so hard to get them loose that you left marks in the bed, which is another sign that the gap was too small. Yeah it may be a lost cause at this point, but that's why beds are replaceable. Learn what mistakes you made and ask questions sooner with the next bed. There is a huge learning curve to get started with 3D printing and you will certainly make other mistakes as you go -- don't worry, we all do it -- but you can avoid some things by reading a lot of posts in these groups to see where others failed. Until you reach the level of physically modifying your printer, damaging the bed will likely be one of the worst things that happens (I destroyed my original controller board because I changed one of the steppers and forgot to modify the wire). Hang in there, you'll get it figured out!