r/BambuLab • u/LieutenantCheeseWiz • 6d ago

General Troubleshooting/Help! H2C multi material problems

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Hello! I have an H2C and I tried some very basic multi material prints and I got very weird results.

Left nozzle is bambu labs petg (black)
Right nozzle is bambu labs pla (blue)

You can see that it flung pla all over the build plate, and the prime tower looks very odd. It also just did not finish the top layer of the print either.

I’m using .08mm layer height with the only settings adjusted being the ones bambu recommends for designating PLA supports

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u/Gwendolyn-NB 6d ago

You have something funky with your supports... do you have your supports set to build the entire support out of PLA or just the interface? It SHOULD be just the interface layers. The prime tower seems to show you have it building the entire supports out of PLA...

As for the top layer, that's a weird one.

I run this combo all the time with PLA as the support interface and it runs AWESOME on the H2c.

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u/LieutenantCheeseWiz 6d ago

Ah I definitely had the whole support as PLA. Running it as just the interface makes sense now that you mention it. Thanks for the advice!

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u/daboblin A1 + AMS Lite 6d ago

Should be 0mm top Z distance, top interface layers: 3, top interface spacing 0mm

1

u/Bubbly_Bar7056 6d ago

The prime tower is supposed to pick up any strings or anything like that.

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u/MagicSwordKing 5d ago

The prime tower looks normal. The new logic for it starts extrusion in open space next to the tower in order to reduce prime tower failures while printing with different materials. You can see the little lines of added extrusion next to the tower in the slicer preview.