Hello all,
I’ve got 2 x p1s machines. Printing same models in both, same settings. On one of machines only I’ve started to get this problem where there are regular gaps in the print in the same position on each layer, see attached.
I’m guessing it has nothing to do with the hardware because I print a full plate with 8 of the same models each facing different directions.
I’ve run a flow dynamics calibration and it looks and seems a little like under extrusion. Nothing shows in the slice.I’ve just run a flow rate calibration but the 0 option was the best so I assume that it is correct already.
I’ve got a feeling that it’s related to the infill and the speed. I noticed that there is no sparse infill in that spot with the default grid setting so I’ve changed it to a rectilinear pattern. The other change I’ll try is a slower outer wall print - down to 50 from 400.
After reading all of it though I wonder if it actually IS the solution.
I keep seeing these posts and even see some of the posted fails in my own prints.
YES, a good calibration is vital and yes again to being able to work around most of these issues.
But…
If the slicer does not show something odd while the print does then only too often it has nothing to do with a PROPER calibration.
Be it the outer wall changes when the bottom of a part if done and only walls follow, overhangs going bad half way through and for no explainable reason or just all sorts of weir things happening at corners and where the head speeds up…
Take these seemingly simple boxes for book nooks…
Basic square box with one or two alignment posts inside.
None of my printers has an issue with them, only my Bambu does…
I tried in the early days to address the issues with the support but did not go anywhere as (at least back then) the support team ignored that my prints come out flawless except for where layer times of flow rates change quickly.
Every Studio version comes with a new feature or two and a few bug fixes.
Sadly these fundamental issues we keep having since day one are still present today.
Take a look when your part prints.
You WILL see some odd behaviour where you print struggles.
Maybe the head going slower around this corner to then speed up for the straight or perhaps the seam going somewhere near this corner.
In the new 1.9.5 is a feature to enable the ‘smooth speed discontinuity area’ - fancy name for a slowing down function to minimise pressure changes in the melting chamber…
It’s at the bottom of the quality settings in the advanced part.
Does not fix all issues but if you can afford to waste some time to hone in it can reduce certain issues.
Thanks for your reply, thoughtful and interesting. Come to think of it, this change did coincide with the upgrade to 1.9.5. however - it still worked on my new p1s, my older one (where this issue was occurring) is identical but 6 months older. So nothing really adds up.
However, I have found the small overhang quality on some of my products is massively improved with this version.
Bambu made a lot of changes in this version.
Many things that caused ongoing issues in previous versions now happen a bit slower and with lower acceleration values.
As the majority of those things happen in the background without the user being able to really change certain things I don’t see all of it as an improvement.
For example I have the model of a card wallet that pushed the cards out when you open it.
In the past I had no issues getting a consistent print speed for three small sections that are taller than the rest of the print.
These three sections are rather vital in the model and printed with the 1.9.5 they keep failing under stress exactly where the transition of speed for the walls happens.
The fancy discontinuity feature does not help in way here, in fact is just more variables to mess things up.
In the past I could just turn the slowing down features off, crank up the fan and maintain a reasonable print speed for those areas that resulted in strong parts.
With the 1.9.5 the only way to get those areas strong enough is to slow down the entire print, so the slowing down for those last 12mm won’t cause as much of a speed change.
Adding over two hours in print time, which I find unacceptable enough to not use the 1.95. for such models.
An update of the firmware or slicing engine should fix existing problems, make things easier and more reliable.
But for a few versions now Studio update make it near impossible to import the finely tuned 3mf files you have to get the same result they produced when they were created.
Totally counter-productive if you ask me.
And no, just importing the STL files to print them with the new default profiles still won’t produce acceptable results, not even using Bambu branded filaments.
