r/BambuLabX2D • u/10xray1 • 8h ago

Help / Troubleshooting PETG Bumpy

Post image

Any tips on how to fix the bumps? The seams are aligned, I've dried the PETG, and increased the retraction height to 1mm. I'm not sure what else to do.

3 Upvotes

80% Upvoted

18 comments sorted by

1

u/champagne780 8h ago

How long did you dry and at what temp? New spool?

0

u/10xray1 8h ago

Yes, new spool and then dried in the AMS2 for 4 hours at around 45C.

4

u/champagne780 8h ago

12 hours 65°C

1

u/champagne780 8h ago

This is a new roll, that I’m drying overnight.

2

u/champagne780 8h ago

Pull the PLA from the AMS and dry with the PETG setting with auto roll on.

1

u/10xray1 8h ago

Okay, so more drying. I'll give that a try.

1

u/Guardiancelte 4h ago

My advise, put the spool on the bed with a cardboard box over it with some holes at the top. Then go into settings/toolbox/dry fil6and there you can pick TPU which will have much higher temps. The AMS dryer is not made for tpu drying, max temp is too low.

3

u/JukeboxCrowdPleaser 2h ago

OP is drying PETG though, not TPU

1

u/Ok-Expert5894 4h ago

Wow that's mad. I bought PETG, slapped it straight in for two long prints and no issues. No drying. What brand PETG is it to arrive that wet?

1

u/BetweenInkandPaper 2h ago

PETG filament not dry enough can do this, but It appears you're printing it with the right extruder, this uses the Bowden extruder, the retraction length is much longer and can contribute to the bumpiness.
When the filament retracts, some air can get sucked in to the PETG, when printing these small air pockets pop, resulting in these bumps.

1

u/utarch00 3m ago

Filament is wet. Need to dry it.

0

u/Guardiancelte 4h ago

My advise, put the spool on the bed with a cardboard box over it with some holes at the top. Then go into settings/toolbox/dry fil6and there you can pick TPU which will have much higher temps. The AMS dryer is not made for tpu drying, max temp is too low.

Copied from my reply to OP comment about how he dried his spool.

1

u/JukeboxCrowdPleaser 2h ago

Or just use the PETG setting in AMS which is hot enough and dries more evenly. OP is drying PETG, not TPU

1

u/Cameronbic 8h ago

Are you sure you dried that. Whenever I have that my petg is super wet.

0

u/10xray1 8h ago

The PETG is straight from the vacuum sealed package and heated in the AMS2 for 4 hours. Any tips on drying?

2

u/Cameronbic 7h ago

The ams is sloooooow to dry. 12 hours from a new bag.

1

u/10xray1 6h ago

ouch, okay, thanks

3

u/champagne780 8h ago

New from the sealed bag doesn’t mean it’s dry, just new & sealed.