Recently, I have been having trouble printing properly. As seen in the photo, the first few layers are perfect, but then there are holes everywhere. I have calibrated everything: the printer, the flow, and dried the filament. I am using Bambulap PLA with a 0.4 nozzle (new nozzle) and the standard 0.2 layer height settings.
Any ideas?
Can you post a screengrab of the preview screen so that we can see what the part looks like after you’ve sliced it? Posting just a picture of a failed print without additional details makes it challenging to provide helpful guidance. More information will enable the community to assist you better.
In the meantime, this image brings two things to mind. The first is that the part fan is kicking in at a specific layer. This can be modified in the the cooling settings.
The second thing that comes to mind is that this is a classic scenario where print speed is being influenced by a second part on the plate which is why I asked for the screengrab of the preview screen. Either way, this is a case of under-extrusion possibly caused by poor filament flow which can be attributed to a couple of factors but speed is one of them. This could be because of improper calibration or simply binding of the spool itself so if you’re running this from an AMS, try to print without an AMS.
Here are some troubleshooting steps you can try:
Note: Although I will acknowledge that the speed variations can also be micro-managed from the speed menu, that process requires a lot of finesse and analysis of the head movements in the preview screen. It doesn’t sound like you have the appetite for this, which is why I mentioned it but didn’t expand upon it.
Hi Olias,
Thx for the reply, here the screen of the slice:
I checked the settings for the fan speed and those are standard. (same as youre screen)
Ive tried Silent mode but the print qualitie is still bad different model but the same holes/layer gaps as the first picture.
Im now printing without AMS to check if there is a feeding problem and after that i will try flow ratio.
There’s your answer right there and it was what I betting on. There is a well known issue when one has two objects on a plate. The speed of the transition from one model to another influences each other and his very apparent in the scenario you described.
You actually have two problems. The first is the issue with filament flow influenced by two models on the same plate of different heights. The second issue is that it’s unclear whether or not your filament is properly calibrated. Fix issue one before moving onto issue two. You may not need to readdress the calibration.
You want to turn on “Print by Object” under the Global Process Menu under “Others”
What this will force the slicer to do is complete one print before moving on to the next model. There is a throughput cost here. Because the slicer knows there will be a completed print on the plate before starting the next model, a safety measure is put in place that restricts how close two models can be to each other on the plate. This ensures enough clearance for the print head to avoid interfering with the model already standing on the plate. This may prevent all of your models from fitting onto the same plate, necessitating more than one print.
Here’s what that looks like when Print by Object is turned on and the two objects are too close together. I will use two cylinders of approximately the same size as your example to illustrate what you will run into.
Just click on autoarrange.
If there is enough room, the slicer software rearrange as many of the objects onto the plate as possible and move the objects that don’t fit off the plate.
The slicer’s software will do a very coarse estimate of where prints can fit using autoarrange. What I prefer to do is to micro-manage that process by changing the sequence in which the models print and then moving the taller models to the front of the plate and the shorter ones to the back.
Here’s how that works. In example one, the cylinders all collide and the slicer won’t let you slice.
Manually drag the models into the desired order in the plate window, with the first model listed on top and the last model on the bottom. This will ensure that once model #1 is completely printed, it will be out of the way of the other models.
If you merge two models together as an assembly, the slicer will be tricked into treating the combined model into one. Note that if they are different heights, you’ll get the same lines. But if they are the same, then combined them.
Here’s how that looks.
After assembly, the slicer treats the combined models as one and allowing for closer spacing.
For a better explanation of why this phenomena happens, view this video. This is where I got my answer from when I first ran into this issue.
I tried 2 prints with and without AMS. The one without AMS was perfect, and the one with AMS had the same problems as the first picture.
What you describe above is also an issue I’ve encountered before. It looks more like what is shown in the video you sent.
I will take the AMS apart to see if something is broken.
Cleaned all the parts of the AMS and from AMS to Printer.
First test print after cleaning AMS looks way better, Still some layer gaps but not like before.
Printed before cleaning: (stopped print)
Printed after cleaning: (still not the best layers see second pic)
i will try again a flow CAL now the AMS is clean.
