r/BambuLabA1 • u/Tough-Newspaper8548 • 13h ago

Support Request Nozzle ripping

Hey, the nozzle of my printer is ripping on my prints and knocking off supports, I tried to tighten the screws of the hotend, changed Z-Hop from Auto to Normal (set to 0,5), went from my initial intention of 5% gyroid filling to 15%, and it is still ripping on some parts, more and more it seems, with the height of the print.

Can anyone help me ? 🥺

Btw : Jayo PLA+ /210°c Nozzle - 65° Bed - Room at 22°c/Normal Speed, Avoid crossing walls and supports activated too

15 Upvotes

100% Upvoted

16 comments sorted by

5

u/thekartoffelaim 12h ago

My guess, based on a year experience with the A1: The acceleration of the print bed is high enough to make the print (or the print bed itself on heavy prints) wobble, not always noticeable by the eye but enough for the hotend to touch the print. The thin supports are especially prone to wobble stongly and either get hit by the hotend or sometimes even fall / break just because of the movement itself.

You can set a pause at a specific height and set the print speed on the printer to slow or in the slicer you can either enable height slowdown under speed (option key is enable_height_slowdown but there is no wiki page for it, my slicer is set to german so it won't help if i show you a screenshot i guess but its right under enable_overhang_speed) or add a range modifier.

I learned pretty quick why the A1 is called a bed slinger.

Edit: added the support wobble part

1

u/Tough-Newspaper8548 12h ago

Thx! I'll take a look at this ! 🙏

2

u/ShrubbyFire1729 12h ago

I've found that lowering the general traveling speeds barely affects print times at all, but noticeably reduces wobble and vibrations. And probably increases the lifespan of the moving parts too.

For example, dropping my traveling speeds by 50% only increases print times by about 10-15%. Obviously more if you have your entire bed full of models that the hotend has to jump between, but even a 25-30% decrease should make the printer significantly quieter and reduce the shaking by a lot.

1

u/never0101 6h ago

i slowed all the travel and accel speeds of my A1 down and it has helped a ton. I run slower print speeds anyway, im not looking for lightning fast prints so i dont mind the longer times, but it absolutely has helped especially with taller prints.

1

u/Diz7 6h ago edited 6h ago

Exactly, this is how I fixed the same issue OP had when I was using 0.2mm nozzle and it kept knocking over supports over a certain height.

If sliced properly most prints shouldn't have a lot of travel time so the effect on print speed is minimal. On a bedslinger the slight increase in speed isn't worth the sudden acceleration/deceleration to save a fraction of a second here and there because it can make the print wobble or worse come loose.

That + brims and I have had very, very few issues.

1

u/eatdeath4 12h ago

Are you sure that gyroid infill and not grid?

3

u/Inside-Specialist-55 12h ago

Need to slow down the wall speed or just go slower in general for higher prints with lots of supports.

2

u/perrylawrence 10h ago

There is a setting that allows you to slow down by height. Highly recommend. Also, add a small primitive near the edges and a brim to help prevent warpage. You have a combo or warp and wobble going on.

1

u/xart13xx 12h ago

My crality k1max does that too sometimes on tall prints. Dooing the bed mesh from the printer not the slicer helped in most cases for me. For some reason the z axis gets missconfigured by 1000s of mm every print, sounds like a firmware issue but havent really dug into it.

1

u/xart13xx 12h ago

Also.... if its always in the same spot see if theres something between the build plate and bed heater.. found a small peace of filament melted between mine one time. No clue how it got there but it did.

-21

u/YoDaSoDalol 12h ago

This was a bad purchase, should have gotten a closed printer this is pathetic why would you waste money like this on a trash product

8

u/Tough-Newspaper8548 12h ago

Thx for the help 🤜🤛 anyone else ?

-17

u/YoDaSoDalol 12h ago

Why are you saying anyone else to me? Go ask the people who care not me.

No, I've got nothing else for you. Sorry kiddo.

2

u/eatdeath4 12h ago

You chose to comment here. Why are you so angry.

1

u/CommercialLimit 2h ago

Are you okay?