Sometimes my H2D just stopps the toolhead in the middle of a print for no visible reason, leaving a blob of filament in the model. After 30 seconds it continues normally without any error or warning.
I have no idea what this is, so I share this with all the information around that might be relevant to understand whats happening.
The filament is BambuLab PETG HF and everything on default settings.
I have several theories but no clue and I’m not willing to print midsized models for every possible tweak.
So maybe someone can help here.
My thoughts so far:
It could be related to the GCODE reading. Together with the speed it prints, it might not be able to keep up. Especially on (unneccessarily) high detailed models.
Or maybe it’s the USB Stick. If it is reading GCODE while simultaneously writing live video AND timelapse AND “restore on powerloss” information - that might be too much.
I carefully tested the new USB stick for sustained minimum write speed as the first mini USB drive got very slow and hot and clearly didn’t meet the requirements. So the USB speed should be no bottleneck here.
As you can see in my video above, the live ipcam video is still recording to the USB drive when the toolhead freezes.
The only option I can adjust is: no timelapse.
Maybe the option “Recover from STEPloss” writes to the drive as well - but I don’t know. But Steploss recovery can be done from volatile RAM and doesn’t neccessarily need to be written to the USB drive as powerloss recovery does, which I found no option to turn that off.
Or maybe it is something with the temperature.
If some sensor is defective or a cable is loose, the hotend temperature might drop to a certain point. The printer might wait until it’s up again.
But causing two times a delay of exactly 30 seconds makes not a lot of sense here.
Same for the model geometry causing the filament coolers airstream getting redirected to the hotend and cooling it down so that the printer needs to wait for stable temps… very unlikely - just in my mind.
It also stops for about half the time (15 sec) when cleaning the nozzle on the very beginning. But as I don’t have my requested metadata like temperatures along in the video, I cannot tell if it just waits to heat up.
It now happend several times on midsize or larger models - not on smaller ones.
Once I saw it happening and the printer display WAS responsive at that time, telling me the layer number where the problem occurs. Everything seems to be okay. But I didn’t check the temperature readings in that moment.
In every case I have exported STL files with a huge amount of triangles from freeCAD into BambuStudio. Several hundertThousand.
I tried the “simplify model” option in BS and got no blobs in that prints. Also I now exported STEP files, that are a lot smaller and printed one part without freezing.
But this is only correlation, not a prove of the cause…
Oh, and the printer is in LAN only mode with no connection to the internet (per router firewall rule). So no influence from the cloud here.
Any ideas?
