TPU95-HF

[cedar parcel]

Hello friends, any thoughts on why the first part of the print would look fuzzy like that? Rest if the print is pretty perfect

[ruby furnace]

Too many retractions or non-printable moves maybe.

[cedar parcel]

Thank you for the input!

[keen solar]

I would say the same

The line stops when the retractions stop

[jagged terrace]

Also maybe not enough layer time to cool

Could try slower

Can also try keeping travel moves inside part. Which will only partially work here as there are distinct “islands” at the beginning but might still help where it can.

[cedar parcel]

Appreciate you taking a look, thank you

[jagged terrace]

Basically you are getting stringing due to needing to jump from island to island. Have you done a temp tower or retraction test to tune for stringing?

[cedar parcel]

Temp tower was good at 200

Didn't do a retraction test

It's 1.5 on a direct drive kobra standard

40mms speed

Should have said that to start, sorry

[jagged terrace]

I would try tuning retractions. And keeping movements inside the part as much as possible generally helps any stringing you do have stay invisible inside part. Here my goal would be to keep it on the inside edge of fins if possible and not on sides. Not sure if you can coax that out of the slicer.

[winged latch]

The fins wobbled when printing because it is not stable enough, maybe adding extra support, increasing printing temperature (with dry filament) and reducing printing speed should help

[cedar parcel]

Thank you, I will work on all these suggestions. Overall I am thrilled with the material!

[jagged terrace]

top looks great!

[cedar parcel]

Question if you have a min. My room is 20% humidity, how long can this material sit out before needing to be dried again?

More support, less retraction, some improvement

[winged latch]

Hard to say but looking at the print, it could already benefit a round in the dryer

[cedar parcel]

appreciate it

[keen solar]

I was thinking the same thing because the rest of the print looks different then the first picture if you didnt change the temps at all

[cedar parcel]

That was the same temp

[cedar parcel]

Thank you for taking a look

[jagged terrace]

Yeah I’d dry it looking at that last one.

[cedar parcel]

Ok so I have dried it overnight and printed again. the last issue is the voids

voids. I usually see this in silks with too much retraction.

current retraction is 1mm at 25mm/s

I have done temps from 190-210.

Any other suggestions are sincerely appreciated. This is a gift for my cousin and I wanted it to look a bit better.

[winged latch]

Do these voids match anything on the slicer preview? (retraction, inner wall end, ...)

[cedar parcel]

not that I can tell

Could be travel moves on the lower fins

But the cylinder part doesn't make a lot of sense to me.

walls are outside to in

[winged latch]

It seems that you have much more holes on one fin compare to the other, is it correct?

Not sure if thats the case here, but often times people tweak their profile a lot before even the first print and then end up with many issues and continue tweaking the profiles while just going back to the generic profile was already good.
I assume your first print was with the generic TPU95 profile on Cura right?

[cedar parcel]

Yes, what I changed from that first print was to add more supports to the fins since the lower parts were a huge mess and I reduced retraction.

[cedar parcel]

Also I sincerely appreciate all your replies

[winged latch]

Seems like the first print did not have all the holes, and after modifying the support and retraction the voids appeared.
But I dont understand how both would be linked to these holes

You havent changed anything else? (expect drying the spool)

Something went wrong between your first print (no holes) and the second one (holes)
Can you try putting back the default retraction? (anyway you dried the spool so you wont have much stringing issue anymore)

[cedar parcel]

I have been saving them as their own profiles each test so I will go back and compare

the default retraction was 8 in the first print

which I didn't check

since this is direct drive I dont want to get jammed with that much retraction

[winged latch]

The first print: the top is good
The second/third print: the bottom is good

The only difference is more support and lower retraction.
I dont think the support would create the holes, but maybe there are some relationships between retraction and the holes (although I would not be able to explain it)

From a logic stand point, I would just put back the retraction from the first one and see if you can get both the top and bottom good 🙂

[cedar parcel]

Noted, I will keep hacking at it. Thank you @winged latch

I will also say the product is sound, just a bit ugly

[winged latch]

(I asked why the holes were only on one side of the print, cuz depending on where is the extruder it can be harder to pull the filament, so maybe one fin was further a way or something like this, in which case you would only need to reposition your spool somewhere more suitable)

[cedar parcel]

spool is right above the print head on the top and the holes are all around the print a bit randomly

It won't print from my dryer

too elastic

[winged latch]

ok then its not that

Yeah I can only see the retraction, as your first print didnt have that issue (right?)

[cedar parcel]

You can see hints of it in the first print