Hi, it seems that between material changes the print head will move to 0,0 and stay there for a second or 2 for some reason. This however gives the material a chance to ooze a bit from the nozzle, and then gets deposited on any parts between 0,0 and the nozzle wipe area. The strings then get printed over, incorporating them into the part. The PA12-CF I’ve been printing doesn’t ooze during this move but the Support G material I use with it oozes a lot during this. See attached photos for an example and resulting part.
Can we disable this homing move for every material change? OR if this is required, can the print head move from home to the nozzle wipe area by following the far left edge of the build plate, then the back edge so that it doesn’t move over the parts being printed?
That’s not homing, that’s the tool head pressing the filament cutter to cut the filament so it can be retracted.
There probably needs to be a firmware update if it’s oozing that much, but I wonder if you can mess with the retraction settings in the mean time to solve this problem on your own while you wait.
I still think it shouldn’t move across the prints after this. Also if it’s just pressing the handle for the cutter, why does it sit there for a second or 2? I’d think this could be a fairly fast move.
I’m currently drying the support G material as well, maybe that will help
It probably shouldn’t, which is why I said it might need to get fixed with a firmware update. But the oozing is usually directly related to retraction, which is something you can adjust now. If you go into the Support G settings you’ll want to make sure “retract on layer change” and “wipe while retracting” are selected and probably increase the amount that is retracting.
Decreasing the nozzle temp a bit will also probably help with the oozing as well.
Probably to make sure it’s actually cut the filament and the extruder is pulling the filament back before it returns to purge.
If you want to watch it in action just unload and load some filament from the AMS. The steps will show on the screen and you can see what it’s doing as it moves through each step as it completes them.
Not directly. I just dry the heck out of everything before use, even if it should already be dry (works for PETG too… if it’s oozing it’s probably not entirely dry). Specially the support materials. Went and bought a proper, accurate, MCU-controlled dehydrator as well as the cheap one I had kept overheating and ruining the filaments.
