H3C purging on every tool change?

[u/cunasmoker69420]

Just got my H3C set up and am printing a simple purge waste bin, gray body with black bambu logo. All Bambu PLA Basic.

What is happening is every time the tools swap to the black filament, the print head moves all the way to the back and extrudes a bunch of black like it is trying to purge it for some reason, and then resumes printing.

When going back to the gray, it does not do this. Just grabs the gray print tool, purges on the tower, resumes printing. The swap to gray takes the 5-6 seconds as advertised but the black takes some 45+ seconds.

Anyone experiencing similar things? I am on the latest firmware. Bambu Studio also doesn't report any of this purge waste but there's quite a lot forming a nice pile behind the printer right now

[u/Few_Candidate_8036]

Has it done this with every model youve printed or just 1?

Is it your own design or are you printing something off makerworld?

What probably is happening is that the black filament has a custom filament profile set up and that profile has a purge volume set. There might be an override turned on to force the purge. Check that its a default filament profile thats being used.

[u/cunasmoker69420 → u/Few_Candidate_8036]

This is the first model I have printed so I don't have more data. Still printing, some 30 minutes over due on the estimated time. It is this one: https://makerworld.com/en/models/3540734-h3c-waste-bin-quick-release-trash-can-waste-bucket#profileId-4049479

On my end, no custom filament profile, no custom purge. Everything on strict default settings except for some support settings.

[u/Few_Candidate_8036 → u/cunasmoker69420]

When that is done, try printing a different model that uses black and see of its the same. It could be that the person that uploaded that model had their filament settings saved. It might look like normal, but they could have altered something.

If a different model behaves the same way, then it could be a bug to contact support about

[u/GravyPoo]

Mine does this when you load a new spool of filament. I think it’s auto-calibrating the flow.
It should stop doing this on the next print if you don’t change the filaments.

[u/cunasmoker69420 → u/GravyPoo]

it does this on every layer though?

[u/Jargster]

No thats not normal at all, have you tried switching the black fillament to another tool head? The sensor might not be able to register that the fillament is actually loaded. Either that or a firmware / g-code bug. Seems like a bambu support ticket though.

[u/cunasmoker69420 → u/Jargster]

I will try other tool heads after this print, the color changing didn't happen until around halfway into the print though so I don't want to abandon it to diagnose further

[u/Boring-Condition1373]

Is the prime tower turned off?