The first layer only holds on one side of the bed
Colleagues - I have run out of ideas for a solution
my printer is a Vcore 3.1 AWD
The situation is as follows: in one place the print adheres extremely firmly (it is difficult to tear it off later), while in other places the filament practically does not adhere to the table - it literally just "licks" it. This problem mainly affects large prints, where the differences in adhesion are particularly noticeable.
I have already replaced two PEI plates. On the new plate, the adhesion for small prints in the middle of the table is phenomenal - so good that it is sometimes difficult to tear the print off the spots, even after removing the plate from the table, Unfortunately, with larger prints, the felt in other areas of the table does not stick at all.
What I have done so far:
I have replaced two PEI plates with new ones.
I thoroughly cleaned the table surface with isopropanol (IPA 99%)
I performed Z-height calibration (I used a piece of paper) at least 30 times.
I performed bed mesh leveling about 50 times.
I tested different table and nozzle temperatures to find the optimal settings.
I have noticed that lowering the head (changing the Z-offset) causes the filament to literally rub into the table in the "good" areas, ending up damaging it, while in the "bad" areas the adhesion remains poor.
Technically, the problem actually only occurs during large prints. Small prints come out correctly, but on larger areas the filament completely fails to stick in some places.
The table may not be perfectly straight (Range
0.284 mm).
I use Euclid Probe to automatically level the table,
The table may not be perfectly straight (Range
0.284 mm) but I am not sure if the compensation is working correctly or if the problem may lie in the configuration. I have checked that the Z-bolts are moving, and it looks like the mechanism is compensating for the unevenness of the table.
Do you have any ideas what else I can check or improve? Any advice will be useful - thanks! 🙏"
10 Replies
Anyone have any ideas??
have you performed the bed mesh levelling while the bed is at the temp you want? 0.284mm of deviation on the flatness of your bed is quite high. You should aim for 0.1 or less. Can you post your bed mesh image?
Yes, I tried doing it at 50C and at 60C
but I honestly don't know how to improve this result anymore
Oh this is actually not that bad to fix. If im looking at this right your Y axis rails need to be retightened in order. Loosen all the bolts on the linear rail and then tighten them from one end to the other while using the printed guides to keep it flat
What printed guides are you talking about?
Oh, i didnt realize this was vcore 3.1. im not familiar with how it was assembled but if there were guides to keep the Y rails centered on the extrusion use them!
Otherwise best judgment lol
But taco shaped beds are almost always due to linear rails being tightened wrong or out of order.
as you said, I loosened all the screws on the Y axis in the guides and screwed them all back to front in turn
this is better but something is still wrong
An additional option is physically pushing downwards on the extrusion holding the y rails. This will help correct any natural bow in either the extrusion or the rail.
It may be necessary to loosen or tighten the linear rail to achieve some more movement. Trial and error is your friend here :)
I’ll tell you that I straightened the frame for 3 days, but in the end I got some effect, the subject of the recess in the bed remained - but I did it with paper and I have the curvature of the bed at the level of 0.179 mm- now runs Like Kitty
Beautiful! Nice work :)