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Blobs on wipe tower  

New Member
Blobs on wipe tower

Iam trying to fix a problem iam having with multi material slicing


iam using a MMU2 modified to run on my custom printer using a duet 2 controller and hemera extruder hotend. i have the tool change macro working pretty good. but iam having problems with blobs on the wipe tower. 


it seems to me that it creates the blob when it does the ramming move to shape the tip of the filament 


the picture i have attached is when i paused the printer just after the very first tool change before it started printing with the new filament.  and you can see the blob it have created 

then at somepoint during the print the hotend or fan duct will catch on the blob and knocking the wipe tower of the bed  


iam using prusament PETG and the default prusament PETG @MMU2 profile 

and my single extruder mm setup page looks like this

Posted : 14/12/2020 4:46 pm
Veteran Member Moderator
RE: Blobs on wipe tower

Is that  the first layer? it looks a bit rubbish, 
possibly too high a negative number...

I would start by sorting that first...

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 14/12/2020 5:41 pm
Active Member
RE: Blobs on wipe tower

Good morning

I have the same problem with a bondtech BMG dragon hotend pheatus mmu2s

does anyone have an idea I can't find anything on google

it only happens on the purge tower


Posted : 31/05/2023 7:09 pm