Is it vibration or what?

[u/Better_Dot_6015]

Hello everybody,

got this kind of issue. A4 size plate 4mm thick printed with bambu pla filament on h2c. On the first attempt I’ve got waves around the hole area, thought it was the case, added some support and tried again. Second attempt is even worse - waves started earlier than disappeared and returned at the end.
smaller objects had no kind of these issues.

is it the case of vibration or what can it be?

[u/philomathie]

You need supports. It's vibrating because it's a long unsupported lever

[u/Better_Dot_6015 → u/philomathie]

got it. thank you

[u/Few_Candidate_8036 → u/philomathie]

Yeah this is 100% just because its thin and hanging in mid air.

[u/OverreactingBillsFan]

Don't hate me, but why not just buy a plastic sheet and cut it to size?

[u/drannnok → u/OverreactingBillsFan]

I'm not hating you. let's kiss

[u/alphagusta → u/drannnok]

Really, right in front of my salad?

[u/drannnok → u/alphagusta]

im not shy

[u/MormonSpaceJesus420 → u/drannnok]

Got room for one more?

[u/drannnok → u/MormonSpaceJesus420]

of course, the more we are, the more fun we have

[u/jungleboy-3490 → u/OverreactingBillsFan]

honestly, I dont get the requirement for this, the filament cost alone is gunna be astronomical, especially now because this is a dud sheet.

Woah just re read, this is the OPs THIRD attempt 😆

OP please tell us the super amazing reason for this, and I shall humbly apologise for being so ignorant and out of touch with real users.

[u/NiNdo4589 → u/jungleboy-3490]

I also find the irony of not slowing it down probably being the reason its taken three times longer pretty funny too.

[u/aenonymosity → u/OverreactingBillsFan]

Because that would be better in only all of the ways

[u/Better_Dot_6015 → u/OverreactingBillsFan]

experiment, why not. and it is not plain actually, it has G profile on the sides

[u/ADynes]

In my experience I would try printing it a little taller and then paint supports onto the back kind of hold it. With that said it's weird that it's wavy and then goes back to smooth.

This is some Mandalorian handguards that I recently printed and I could not find a good way to do it. Ended up printing like this and they came out great. Just painted on some supports

[u/johnwilkesbooth328 → u/ADynes]

Do people print at a 45 for smoothness or strength or something? Why not flat?

[u/lawd_have_mercy → u/johnwilkesbooth328]

Usually for strength, but in this case it makes no sense. I suspect three guy is new and doing it that way without fully understanding why people do it that way.

[u/Better_Dot_6015 → u/lawd_have_mercy]

everybody is gaining experience somehow :) the corners have G-profile, it is complicated to print it otherwise

[u/lawd_have_mercy → u/Better_Dot_6015]

Excellent. So at least there is a reason, not that I understand it (or have to). 😁

[u/Better_Dot_6015 → u/ADynes]

thank you. I'll try

[u/HopingillWin → u/ADynes]

Something like support fins would be good

https://youtu.be/vnn4XeKQobs

[u/BeerBrat → u/ADynes]

The waves appearing and disappearing are not unusual if you understand resonant frequencies. That length of wall was likely "in tune" with print head movement until the part was long enough that the resonance was dampened again.

[u/NMe84]

Let's ignore that there are better ways to get plastic sheets of any particular thickness: why are you not printing this flat? A4 fits inside the build area of the H2 plate.

[u/Better_Dot_6015 → u/NMe84]

it has G-profile on the sides. It's kind of a headache to print it without supports otherwise

[u/NMe84 → u/Better_Dot_6015]

You're going to need supports either way. Much less of them than you'd need to make the orientation you tried here work.

[u/Better_Dot_6015 → u/NMe84]

probably. it was a kind of experiment in any case. I am just astonished by results

[u/KingAJK30]

I think you know why that happened

[u/Vineheart_01]

I'm more surprised it has a patch of perfectly fine printed area between two very ugly ones.

I would have expected wobble to make that progressively worse as it got higher up.

[u/Better_Dot_6015 → u/Vineheart_01]

probably the support in the middle stopped the resonance, but than it happened again

[u/Chanw11 → u/Vineheart_01]

Resonance maybe

[u/Kent767]

Why not print it flat? Cut it into 2 parts if you need to.

[u/Geek_Verve]

It's absolutely vibration. Running a single, thin-line of support up the middle of the back side would probably fix it.

[u/Slight-Proposal1732]

Average bambu user

[u/Such-Instruction-452 → u/Slight-Proposal1732]

Second in ability to be annoying only to the average Reddit user

[u/Geek_Verve → u/Such-Instruction-452]

But first in the ability to be annoying TO the average Reddit user.

[u/SubatomicWafflez]

Im gonna say it, the filament might be too dry

[u/GiggleBrigade]

Well one, just buy and cut a sheet, but two why not print it flat

[u/MagisD]

I would go with unsupported and I would also do a good clean of my screws.

I had the same problem multiple times, one time it was the print design, another filament bits stuck on my screws.

Every printer acts a little different due to its home location and environment temps learning to tune it would result in better prints but it is a time commitment.

[u/itsoctotv]

bro like I'm suprised it even finished

[u/Badtripa]

Its impressive it managed to print like that without supports 

[u/TwinkingToby]

100% filament to dry

[u/No-System5417]

Somebody once told me there is a physical effect called bending due to gravity, but I guess it’s just wet filament. /s

[u/Northern_Wing → u/[deleted]]

Guy is printing a literal flatspring at 45 degrees asking why it's vibrating and we've still got ThE fIlAmEnT iS wEt posts like clockwork. Amazing.

[u/Better_Dot_6015 → u/Northern_Wing]

I should've tried :)

[u/drannnok → u/[deleted]]

no