Hi guys i was hoping on getting some tips on how to improve my long time 3D prints!
My prints generally go fine with the standard settings but i have found some issues with longer prints and overhangs. I notice faults near the top of my print and around overhang areas. Even though these overhangs aren’t that bad neccesarily. I have some ideas to improve it allready but since these are really long prints i hoped to get some tips before trying, I have some pictures and ideas below.
My setup:
Bambu P1s
Bambu pla marble
Standard settings (except printing outer walls firts to try mitigate layer line changes from more dense infills to thinger walls)
The first thing i was thinking about when i saw this was temp. It looks like nozzle temp might have been a bit to high since it looks like oozing. so i will try lowering this.
I also thought of opening the door so the print can be cooled a bit better. But not sure if this is benneficial on such a large print since the surounding temp might change quite a bit for the lower layers vs top layers wich might cause issues?
I also used the variable layerhight feature to smoothen some transitons. But smaler layer hight on overhangs might also make it more difficult to print? since the steps are so small they might offer less support and greater change of not adhearing well to the layer bellow. No idea if this could be true or not.
I also thought it could be a good idea to dry my filament beforehand wich might help.
If you have any more suggestions or you recognise the faults in my print please let me know!
Much of these artifacts can be reduced, but not completely eliminated, by changing model orientation. Can you post a screenshot of how the model was positioned on your bed when you printed it? That will take a lot of the guesswork out of orientation. Also include a sliced preview. You’ll get higher quality feedback if we can see the model orientation.
From what I see, it looks like your flow rate needs calibration - these little nodules are classic signs of uneven filament flow.
It could also be filament moisture, which is often overlooked. Don’t be the guy who insists it was “factory sealed” or that it spent “X hours in the dryer.” None of that matters unless you weigh the filament before and after drying. If the weight doesn’t change, you can rule out moisture. But in many cases - even with PLA - moisture causes exactly these symptoms, and calibration alone won’t solve it. The point is, if you haven’t done so, you want to absolutely rule out moisture even if you have every reason to believe that’s not affecting your print.
You mentioned switching wall order to outer/inner. That can be very effective, but mostly on vertical walls when unevenness shows. Without seeing the bed orientation, my guess is that if there were outward overhangs, outer/inner may have worked against you. For overhung walls, you want the inner wall printed first to give the outer wall support. If the walls lean inward, then outer/inner is the better choice.
Thanks Olias! This allready gives me some stuff to think about. The uneveness is ocuring on the inward sloping walls so adjust print order of the walls might help allready. I also changed those uper sloping faces to move a bit more vertical instead of horizontal wich might help. I have dried my filament but not weight it yet. I will also do some flow callibrations!
Here are some pictures of the print orientation:
