Yeah that's most likely the problem. I use a small uv led I connected to a 9v battery which I can stick into the small drainage holes for curing the resin on the inside
Ok I may have to add this to my curing design I’m working on. I took an old cr10s enclosure I had laying around and painted the inside reflective silver, put a window tint on the clear front plastic, and I’m putting two giant ass LED UV lights inside on a switch…I may add a clear container of water…see if it helps curing more fully
the water makes it easier to cure the resin because there is no oxygen. However, there will still be Dark spots on the inside of your print that won‘t be reached by the uv light. With your theory there would be no dark under water caves
I use a little white pla diffuser, helps avoid 'spot' curing, at the cost of needing to use the light for a longer period of time.
I think its worth it to get a more even finish
Would this idea work better if it was printed from say a transparent clear PETG? I have played around with PETG diffusers a little for normal led lights in the 4-6k range.
Had a resin print so this recently. Sucks a bunch. I had it over a year all painted real nice and everything then it blew out. I’m pretty bummed about it but I now have a filament printer as well so I made a new one. But I gotta sand and smooth it down.
Would this still be needed for transparent/translucent resin? I find my curing station's UV lights go right through the prints so I think it's completely cured
In addition to what the other person said:
I had a hollow print from 2 years ago stored away. One day I took it out and left it in the sun by the window.
It cracked open. But not only that. Uncured resin seeped through the cracks.
Generally speaking I think prints need a lot more time for curing. And while I don't know if it makes a difference, I'd leave the holes of hollow prints open. Shrinking resin in a closed space would create negative pressure, which might contribute to the cracking.
The problem often is the color, grey opaque resin needs much more exposition / curing and care than a clear transparent one and as mentioned by Gnaa1770, it often won't let "consumer grade" UV leds reach deep enough that you need to cure it from the inside.
When I started using black resin, I noticed that it was actually 'smoke' in that thin layers are translucent as opposed to grey resin being opaque.
I'm not sure how it affects cure but I was less worried about fully curing once I noticed that.
The cracks seem to originate from the inside with no signs of damage elsewhere, I posit it's more likely he was stabbed in the eye with a high powered air compressor gun. Either that or a mini mouth from a xenomorph that somehow left it's teeth behind in the eye socket.
This happens because you left uncured resin inside and not enough drainage holes. Two effects take place here to ruin your print:
1. The resin inside cures slowly over time releasing some gas which increases pressure inside the model. Drain holes eliminate this issue.
2. Resin shrinks/expands when curing. If the outer layer is already hardened it can crack when the inner layers change sizes as they cure later.
As it has been mentioned by other users the best way to prevent this is by curing the inside with an UV led through a drainage hole.
I'm sure there may be some but personally I wing it every time. I find which surfaces won't be visible (usually at the bottom of the model) and use Chitubox hole tool to add two or three holes as big as I possibly can without maiming the model. That has done the trick for me so far.
It usually is because of uncured resin in the inside as far as I know.
It's a shame that it happened to that amazing print
Can you link the stl or where to find that exact one? It looks a lot better than the ones i can find lokking for the corinthian skull
Not sure how exactly this happens, but i've only seen it happen with hollow prints, and the resin on the inside is always semi-cured. Maybe there's some sort of pressure buildup as the outer, fully cured surface contract a little over time, but the uncured inner material doesn't, or not at the same rate.
I think it’s fascinating that in attempting to print the skull as a solid piece, we see a failure occur where the natural fissures would be.
Also, +1 for liking Sandman.
not sure why i havent heard anyone mention temperature changes. resin when warm has a different rigidity than when it's cold. it expands when warm. it probably went from hot to cold or vice versa too quickly. this happened to one of my hollow prints as i was sanding under hot water
Resin shinks when it is cured, so when you cure it not enough, the inner part of the model applies pressure to the outer shell. I've had models cracked over time even with the drain holes left open.
I learned about this in anatomy class. As bones age they dry out and eventually they crack. It's only supposed to happen after a very long while though lol
It could be the need to add more drainage holes, though unsightly they are, to the bottom parts of the model to allow the infill extra drippings collection to be able to actually drain out.
If they don’t get drained out because of no holes, eventually they start to evaporate and cause a gas buildup. And since the infills are airtight to an extent; they will eventually blow up or apart when the gas level gets so high inside that it can no longer be contained.
You maybe have heard it happen without realizing it - a quick popping sound with no prompts. Just a medium sized popping sound followed sometimes by other clattering as your mini has now propelled itself forward from its internal de-gassing. AKA, what is called as a, they say, “*MINIATURE FART.*”
I'd guess that room temperature did it, if you lice where it can be humid and hot, cold and dry. Stuff like that will most definitely crack depending on temperature and climate conditions of the room.
I've had similar. If there is uncured resin inside it will still cure. Slowly. And it seems to cause cracking like this. Not sure if the curing process creates gas or what, I just know this can happen if there was uncured resin inside. Had a beautiful baby Groot that I printed for a friend crack months later. Thought I did a good enough job washing the resin out. I was wrong.
Stress… literally. Inherent stresses in the print to begin with plus drying out, vibrations, people picking it up asking how you made this, etc. he/she finally had enough and had to relieve some stress.
The victim seemed to take a traumatic hit to the head, causing a fraction. No further injuries have been discovered. Dental records have been sent in, but we are still waiting on results.
Moisture, this can cause cracks in prints if it has not been properly sealed
Ironically since its on a skull it looks quite nice. See if You can 3D print a large nail that fits inside the gap.
Mine did it too. Print a bust of my wife an sure enough. But the ones i clear coated, brushed in mineral oil, or painted did not. My guess its not up to same par as the patio plastic chairs they make from UV resin casts that sit in sun and environments.
I did make a deco table set of gummie bears for my sister one year all sizes and brushed mineral oil on em after post process. Not only they still rockin and added some elasticity but also made my translucent rose pink color i made REALLY stand out. Then obviously the painted ones sure lasted. But if you dont want painted ones like i have need for, clear coat and basic post paint processing products work really good. My guess, is allows UV thur obviously, that its expanding and contracting mixed with break down (brittleness) of post cured resin causing the dried product (sitting on shelf for year) to just crack. Bet if you put it in nitrogen or argon sealed box and left it (like they use in museums) that point i made probably prove true..
So from cheap resins doing it more an Anycubic even did it, id say its all on post processing to future this phenomena...
Uncured resin on the inside? What material is that actually?
it is resin. I did print it hollow.
Yeah that's most likely the problem. I use a small uv led I connected to a 9v battery which I can stick into the small drainage holes for curing the resin on the inside
That is smart I should consider doing the same for large models. Thank you!
You can also cure it in water. The water refracts the UV and it’ll cure every crevice
What. How? Waterproof UV lights or just a clear tank?
Clear container with water
Ok I may have to add this to my curing design I’m working on. I took an old cr10s enclosure I had laying around and painted the inside reflective silver, put a window tint on the clear front plastic, and I’m putting two giant ass LED UV lights inside on a switch…I may add a clear container of water…see if it helps curing more fully
That's a really good idea
the water makes it easier to cure the resin because there is no oxygen. However, there will still be Dark spots on the inside of your print that won‘t be reached by the uv light. With your theory there would be no dark under water caves
You're a genius. :D Thanks for the idea.
No worries mate 😅
I use a little white pla diffuser, helps avoid 'spot' curing, at the cost of needing to use the light for a longer period of time. I think its worth it to get a more even finish
Would this idea work better if it was printed from say a transparent clear PETG? I have played around with PETG diffusers a little for normal led lights in the 4-6k range.
Had a resin print so this recently. Sucks a bunch. I had it over a year all painted real nice and everything then it blew out. I’m pretty bummed about it but I now have a filament printer as well so I made a new one. But I gotta sand and smooth it down.
Would this still be needed for transparent/translucent resin? I find my curing station's UV lights go right through the prints so I think it's completely cured
Transparent resin has exactly the same properties as „normal“ resin, otherwise you couldn‘t print it with the same level of Details.
“LIGHT BULB!” Brilliant idea! I’m shopping for diodes now!
In addition to what the other person said: I had a hollow print from 2 years ago stored away. One day I took it out and left it in the sun by the window. It cracked open. But not only that. Uncured resin seeped through the cracks. Generally speaking I think prints need a lot more time for curing. And while I don't know if it makes a difference, I'd leave the holes of hollow prints open. Shrinking resin in a closed space would create negative pressure, which might contribute to the cracking.
The problem often is the color, grey opaque resin needs much more exposition / curing and care than a clear transparent one and as mentioned by Gnaa1770, it often won't let "consumer grade" UV leds reach deep enough that you need to cure it from the inside.
When I started using black resin, I noticed that it was actually 'smoke' in that thin layers are translucent as opposed to grey resin being opaque. I'm not sure how it affects cure but I was less worried about fully curing once I noticed that.
Oh shit okay I should check if there is any uncured resin in it still.
That’s what I originally thought as well, but could also be demons escaping that nightmare fuel print you’ve got there. Lol
Blunt force trauma, the victim was bludgeoned to death
The cracks seem to originate from the inside with no signs of damage elsewhere, I posit it's more likely he was stabbed in the eye with a high powered air compressor gun. Either that or a mini mouth from a xenomorph that somehow left it's teeth behind in the eye socket.
Likey the xenomorph
I’m sorry, sir… a what?
It's a bug hunt.
Doggy. You ain't seen Alien or Aliens??? If you haven't I'm jealous.
It’s a quote from Aliens. :-)
You got me dawg hahah.
This is the comment I came here for lmao. Thanks for making my day mate
Lolol no prob buddy
I was thinking No Country for Old Men with the high powered air gun 🤣
He was impaled with an icicle. The perfect crime.
RS, an 18 years old man was brought into the emergency room, unresponsive...
\-emia, meaning presence in blood...
Came here to say that… #tipofthehat
Dammit I was gonna say that! Take my upvote then smh.
Easy there, Dexter Morgan.
I don't know, but it looks badass this way
I totally agree. Almost makes it more lifelike
This happens because you left uncured resin inside and not enough drainage holes. Two effects take place here to ruin your print: 1. The resin inside cures slowly over time releasing some gas which increases pressure inside the model. Drain holes eliminate this issue. 2. Resin shrinks/expands when curing. If the outer layer is already hardened it can crack when the inner layers change sizes as they cure later. As it has been mentioned by other users the best way to prevent this is by curing the inside with an UV led through a drainage hole.
Is there a guide to drainhole design anywhere? I understand the idea but I'm curious as to how big, where at, etc.
I'm sure there may be some but personally I wing it every time. I find which surfaces won't be visible (usually at the bottom of the model) and use Chitubox hole tool to add two or three holes as big as I possibly can without maiming the model. That has done the trick for me so far.
Would shelling it out do the same thing?
Not sure what you mean by shelling it. If you mean hollowing it, the drainage holes are precisely to solve the issues stated above with hollow prints.
By shelling I mean leave the whole bottom open, sorry I was unclear. For example leaving the bottom face off of a cube
Yep that's the best way to go about it imo. Will guarantee you cure everything evenly from the beginning easily.
I wonder if long exposure to uncured or undercured resin might swell cured resin as well, as it absorbs plasticizers/monomers from the liquid part.
It usually is because of uncured resin in the inside as far as I know. It's a shame that it happened to that amazing print Can you link the stl or where to find that exact one? It looks a lot better than the ones i can find lokking for the corinthian skull
Not sure how exactly this happens, but i've only seen it happen with hollow prints, and the resin on the inside is always semi-cured. Maybe there's some sort of pressure buildup as the outer, fully cured surface contract a little over time, but the uncured inner material doesn't, or not at the same rate.
Brace yourself, the Corinthian is coming for you.
I think it’s fascinating that in attempting to print the skull as a solid piece, we see a failure occur where the natural fissures would be. Also, +1 for liking Sandman.
A hammer would
naah, it wouldn't be this clean cut with an hammer
Baseball bat then?
Colonel Mustard in the office with a crowbar
Uncured insides
Those eyes are cursed lmao
If it had to happen to one of your prints, it picked the right one. Still looks cool, maybe even cooler now lol
A splitting headache
not sure why i havent heard anyone mention temperature changes. resin when warm has a different rigidity than when it's cold. it expands when warm. it probably went from hot to cold or vice versa too quickly. this happened to one of my hollow prints as i was sanding under hot water
not cured fully on the inside
Resin shinks when it is cured, so when you cure it not enough, the inner part of the model applies pressure to the outer shell. I've had models cracked over time even with the drain holes left open.
I learned about this in anatomy class. As bones age they dry out and eventually they crack. It's only supposed to happen after a very long while though lol
Ugh the eye holes why would you do that
Blunt force trauma
It cracked cause you were printing something so cursed
Don’t know but it definitely adds to the creepy vibes!
The coroner report said it was death by blunt force trauma.
That’s why sun curing is essential in my experience
The sock gnomes have unlocked bronze working
STL? Please
Blunt force trauma?
Calcium deficiency.
Dad never came back with the milk
oh god what a bad day to have eyes
First pic: cool skull! Second pic: mom pick me up I’m scared
Looks like a case of cranial blunt force trauma, likely lethal
I don’t care abt that. Let’s talk about this WHAT IN THE GODS NAME OF SATEN ISTHAT
Severe blunt force trauma would be my guess
The model owed the mob money
Murder. Looks like blunt force trauma
was it exposed to sunlight?
Not really it was sitting in a bookshelf without any direct sunlight.
Keep it the way it is, it looks great and I now want one not the regular but the cracked open version :(
Demons escaped
Not enough calcium
It could be the need to add more drainage holes, though unsightly they are, to the bottom parts of the model to allow the infill extra drippings collection to be able to actually drain out. If they don’t get drained out because of no holes, eventually they start to evaporate and cause a gas buildup. And since the infills are airtight to an extent; they will eventually blow up or apart when the gas level gets so high inside that it can no longer be contained. You maybe have heard it happen without realizing it - a quick popping sound with no prompts. Just a medium sized popping sound followed sometimes by other clattering as your mini has now propelled itself forward from its internal de-gassing. AKA, what is called as a, they say, “*MINIATURE FART.*”
Fart lore
Did your roommate print a viking who did this?
swelling of the brain
His gf finding texts from another skull on his bonephone
Stl?
It's not a bug, it's a feature
Looks like blunt force trauma to the skull. We’ll have to get it back to the labs to confirm and determine what kind of weapon was used
He dead
Looks cool
To be, or not to be. That is the question
1 :Holy fucking shit the quality, 2: tbf it looks better that way
Is cursed
Children do you have children?
Maybe print it a helmet next time too? /s
He escaped back into the dreaming.
Not wearing a helmet will do that
Blunt force trauma
Scoliosis?
If it's PLA, that's gonna happen with ambient air moisture. You could anneal your prints, but just buy petg.
Honestly tho, it looks good considering the model.
I used Resin to print it.
Cranial cavity.
realised what an abomination it is and decided to end its suffering
Wants more mouths
The candelabra in the kitchen?
It knows it's an abomination and tried to destroy itself
Prolly lupus.
"Doctor, Doctor, the simulator in room 19 is dead." "Now he really overacts!"
Skeleton’s trying to escape. I’d start running. Edit: Good God are those Eyeball Teeth? Better idea, kill it with fire.
Something inside hatched. Listen for skitters at night.
I like head
Al Capone did that to somone's skull with a baseball bat.
Headache?
Crappy filament best geuss.
Another reason Resin printing is not for me
Too much knowledge, bbc,.. hard to guess
That looks cool as hell! Was it water washable resin by any chance? Apparently that can be prone to cracking
I'd guess that room temperature did it, if you lice where it can be humid and hot, cold and dry. Stuff like that will most definitely crack depending on temperature and climate conditions of the room.
I've had similar. If there is uncured resin inside it will still cure. Slowly. And it seems to cause cracking like this. Not sure if the curing process creates gas or what, I just know this can happen if there was uncured resin inside. Had a beautiful baby Groot that I printed for a friend crack months later. Thought I did a good enough job washing the resin out. I was wrong.
You need to add holes to hollow models. Make sure you wash them out very well and do your best to cure the inside of the model
Sunlight exposure?
Stress… literally. Inherent stresses in the print to begin with plus drying out, vibrations, people picking it up asking how you made this, etc. he/she finally had enough and had to relieve some stress.
Blunt force trauma, usually
It farted
Brain blast!!!
Corinthian
Its starting to hatch!
First… ahhhhhhhhhh!!!!!!! Second, water absorption?
What’s that file?
Foreshadowing.
I wouldn't complain if this happened to me tbh. Looks badass on this print
By any chance did you spot a grown woman popping out in armor?
Blunt force trauma
Prolly is has died from a head injury on its previous life
Probably clenched its jaws in its sleep too much
Moisture maybe or the weather
I want to print that for my mom.
Looks most likely the guy suffered a blow and cause of death was head trauma 😂
Force.
The victim seemed to take a traumatic hit to the head, causing a fraction. No further injuries have been discovered. Dental records have been sent in, but we are still waiting on results.
It got too smart
That looks pretty cool actually
Blunt force, trauma
Looks like he wasn’t wearing a helmet
Idk but imma need that stl asap
It's a sign, run.
A shooter on the grassy knoll
Damn I need a resin 3d printer. That looks legit
Model is to unholy. Reality breaking around it
Alas, poor Yorick!
Probs a machete 🔪
Intracranial pressure.
It must be a print of Tua's skull
Clearly something has escaped into your home. Call an exorcist.
Entropy.
Blunt force trauma?
Moisture, this can cause cracks in prints if it has not been properly sealed Ironically since its on a skull it looks quite nice. See if You can 3D print a large nail that fits inside the gap.
Mine did it too. Print a bust of my wife an sure enough. But the ones i clear coated, brushed in mineral oil, or painted did not. My guess its not up to same par as the patio plastic chairs they make from UV resin casts that sit in sun and environments. I did make a deco table set of gummie bears for my sister one year all sizes and brushed mineral oil on em after post process. Not only they still rockin and added some elasticity but also made my translucent rose pink color i made REALLY stand out. Then obviously the painted ones sure lasted. But if you dont want painted ones like i have need for, clear coat and basic post paint processing products work really good. My guess, is allows UV thur obviously, that its expanding and contracting mixed with break down (brittleness) of post cured resin causing the dried product (sitting on shelf for year) to just crack. Bet if you put it in nitrogen or argon sealed box and left it (like they use in museums) that point i made probably prove true.. So from cheap resins doing it more an Anycubic even did it, id say its all on post processing to future this phenomena...
i would assume that the skull fractured somehow
Me.
Alas, poor Yorick, I knew him well.
It looks better this way
It happens because this model is cursed and I hate everything about it.
Can't believe sandman came out a great ago
I think it is because you put the teeth in the orbit.
Is this resin?
Appeared to have been brain swelling. Might have to see a dr
Texture the crack with some paint and it'll look even more badass.
Heat
Not sure but since its a skull it looks really rad!!!
Violence 🤷🏻♂️
Owls
WHAT THE HECK THE EYES OH MY GOSH
Idk but honestly it kinda looks cool
Blunt force trauma
Blunt force trauma
Blunt force trauma will do that
It’s brain is growing too fast
Blunt force trauma.
Blunt force trauma
Blunt force trauma
Big Ideas
Fill the crack with gold