Resin 3D prints have issues, but one that I noticed is how they start to warp and lose shape. This is an issue that can really ruin your print quality, so I looked into how to fix those resin 3D prints that go through this problem.
To fix resin 3D prints that are warping, you should make sure your models are properly supported with enough light, medium and heavy supports. Try increasing your normal exposure time so the cured plastic is hardened enough. You can use an optimal orientation to reduce warping in resin prints.
This is the basic answer that can point you in the right direction, but there is more useful information that you’ll want to know, so keep reading for more.
Why Are My Resin 3D Prints Warping?
The process of resin 3D printing goes through many changes in terms of the properties of the liquid resin. The curing of the resin is a process which uses UV light to harden the liquid to plastic, which leads to shrinkage and even expansion from the increase in temperature.
There are many internal stresses and movements that contribute to resin 3D prints warping.
Here are some of the main reasons why your resin 3D prints might be warping:
- Models aren’t supported properly
- Exposure times under or over exposed
- Part orientation not optimal and causing weakness
- Low quality resins with weaker properties
- Thin wall thickness
- Resin prints not dried before curing
- Layer height is high for model
- Leaving prints out in the sun
- Over curing prints under the UV light.
Having an idea of why your resin prints warp is essential in understanding how you can fix this. Since you now have an idea of some of the reasons your resin 3D, let’s take a look into how you can fix your warped resin prints.
How To Fix Resin Prints That Are Warping?
1. Support Your Models Properly
One of the first things you’ll want to try to fix resin prints that are warping is to ensure you are adequately supporting your model. The foundation of resin printing requires something to build on top of since you can’t print in mid-air.
When it comes to areas like overhangs or unsupported parts such as sword or spears on a miniature, you want to make sure that you have enough supports to hold up the part.
Another thing you should look at is if you have some kind of base or stand for your model. These tend to have flat surfaces which require support underneath. The best way to support these are to use heavy supports at a good density to make sure it is being held well.
In some cases, if you don’t support your model well enough with the right size and number of supports, the suction pressure from the resin printing process can actually lift the fresh new layer of resin and detach it from the model.
As a result, not only do you get a model that starts to warp since it isn’t properly supported, you can also get residue of slightly cured resin floating around the resin vat, potentially causing further print failures.
It’s important to learn how to properly position and support your resin models, especially if you don’t have much experience with it. Personally, it took me a while to get the hang of it from trial and error, so I’d recommend watching a few good YouTube videos on it.
One video you may find useful is from Monocure3D who made a video how to support models in ChiTuBox, a popular resin printing software.
2. Use an Optimal Normal Exposure Time
A common problem that people come across with resin printing is getting the right exposure time. This can definitely lead to potential warping in models due to similar reasons as not having enough supports.
Normal exposure times determine how strong your resin cures in the printing process.
A resin 3D print that is under exposed with low exposure times will create cured resin which isn’t so strong. I’ve created under exposure resin prints and I noticed that many of the supports don’t completely get printed, and the supports are a lot more flimsy and weak.
When your supports aren’t being created optimally, you can quickly find that key areas of your model don’t get the foundation they need to create resin prints successfully.
In this case, it would be better to over exposure your model than under expose, so the supports can hold up the model, but obviously we would ideally want to get the perfect balance for the best results.
I wrote an article about Calibrating Your Normal Exposure Time which you can check out for a more detailed explanation.
I’d recommend checking the video below to get the ideal exposure time for your specific resin 3D printer and brand/type of resin.
If a model has many thin parts, it may be a good idea to test different exposure times.
3. Use An Efficient Part Orientation
After supporting your model properly and using a high enough normal exposure time, the next thing I’d do to fix warping in resin prints is to use an effective part orientation.
The reason this works is similar to why good supports work because we are ensuring that parts that are likely to warp are oriented properly. If you have parts that overhang, we can orient the model to stop this overhang altogether.
As you can see below, I’ve got a knight model with a sword which has a lot of overhangs since the sword is almost at a 90° angle.
If you were to print in the above orientation, you are likely to see more warping since there needs to be a foundation below it to print properly. Resin prints can’t print in mid-air, so what I did was change the orientation to reduce the overhang of this thinner, delicate part.
It works because the sword supports itself vertically and can build upon itself.
It’s easier to support other parts on the knight model because it isn’t as thin or flimsy as the sword would be. Pay attention to these parts when you are deciding your orientation, and you can use this to reduce warping in resin prints.
You can also improve surface quality by using a good print orientation.
For large models, users commonly incline it at an angle of at least 15-20° away from the build plate to reduce the surface area of each cured layer. The less surface area you are curing with each layer, the less suction force can cause warping.
Try to get delicate parts tot self-support themselves for the best results.
4. Make Use of Tough or Flexible Resin
You may experience warping in resin 3D printing due to a lack of flexibility or toughness in your resin prints. When you use cheaper resins that don’t have strong properties, warping is usually more likely to occur.
One way you can fix warping in this case is to use higher quality resins or resins that have tough or flexible characteristics. Many users have had great results by mixing tough or flexible resins in with their normal resin as a way to add durability to their models.
In the video below, Uncle Jessy runs some strength and durability tests on models, comparing ABS-Like Resin and a mixture of ABS-Like Resin & Siraya Tech Tenacious Flexible Resin (Amazon) to see the possible improvements.
These resins should be able to handle a lot more bend and warping, so it’s a great fix for some of your resin models that warp.
The process of resin printing and curing causes the edges of the print to pull inwards, so having that flexible quality can translate to reducing warping.
An example of a tough resin is the EPAX 3D Printer Hard Resin from Amazon.
5. Increase The Wall Thickness of Your Prints
Warping can also come about after you hollow your models and give it a wall thickness that is a little too low. There is usually a default value that your resin slicer will give you for the wall thickness, which is usually between 1.5-2.5mm.
As we’ve learned, the process of resin being cured layer by layer can cause internal stresses from shrinking and expansion, so this can also affect the walls on your models.
I’d recommend using a minimum wall thickness of 2mm for all models except for miniatures which don’t usually require hollowing depending on how big the model is.
You can increase wall thickness to increase the overall strength and durability of your models, especially if you are going to do a lot of sanding. Models that have thin parts built-in can be altered to be thicker if you have some design experience.
In most cases, thin parts shouldn’t warp just because they are thin, rather based on exposure settings and how you handle the post-processing. I’ve printed many thin parts on a resin model successfully, ensuring that my exposure times and supports were satisfactory.
As mentioned above, make sure your supports are doing their job, especially with these thinner parts to reduce warping.
6. Ensure The Prints Are Completely Dry Before Curing
Another way to fix resin 3D prints warping is by making sure that the prints are completely dried up before curing it. Most resin prints are washed in Isopropyl alcohol which may cause swelling when curing.
You can prevent this potential warping by letting your resin prints dry before curing it in your choice of UV light. This is a lesser known solution but still reported by some resin 3D printer users out there. I think it may depend on what type of resin and UV curing station you have.
I usually pat dry my resin prints with a paper towel to speed up the drying process. Isopropyl alcohol dries faster than water but it still takes some time to fully dry by itself. You can also use some kind of fan or blow-dryer at no heat to speed things up.
The Honeywell HT-900 TurboForce Air Circulator Fan is an example you can get from Amazon.
7. Lowering the Layer Height
As mentioned above, the layer-by-layer process of resin printing means that there is a staircase effect to create models. The longer the “staircase”, the more room there is for a model to warp between supports and the foundation.
Lowering the layer height could help reduce warping by requiring less space for each step, but it could also work against you due to each layer being thinner and weaker, giving more potential to break with the suction pressure.
The standard layer height for resin printing tends to be 0.05mm, so you could try between 0.025 – 0.04mm and see how that works out.
This solution would really depend on why the warping is happening in the first place, and how well-supported your model is. If you have correctly supported your model, using a lower layer height should work well to fix other warping from smaller areas.
8. Store the Prints in an Optimal Environment
It’s possible for parts to start warping after the printing process, due to being left in the sun which will cure your resin prints. Some users reported seeing warping after leaving resin models by the window where UV light could affect the print.
I’d recommend either leaving parts away from direct sunlight or treating it with some kind of anti-UV spray to protect the model.
The Krylon UV Resistant Acrylic Coating Spray from Amazon is a good choice.
9. UV Cure Parts Evenly
A lesser common fix for solving your warping problem is to ensure you cure your resin prints evenly, especially if you have a model with small, thin or delicate features.
For example, if a model has a thin cape, you wouldn’t want to put the model face down and have the cape absorbing most of the UV light. This could potentially over cure and warp the cape depending on how strong the UV light is and how long you cure it for.
You should try to use a UV curing solution that has a rotating turntable which makes it easier to cure your models evenly.
I’d go for either the Anycubic Wash & Cure or the Comgrow UV Resin Curing Light with Turntable from Amazon.
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How do you keep resin 3D prints from warping? ›
Remove supports as needed to ensure that light reaches all part surfaces. Leave supports in place whenever possible to prevent features from warping during post-curing. The Form Cure turntable has a diameter of 19.3 cm (7.6 in), and the maximum part height that can be post-cured in the Form Cure is 18.5 cm (7.28 in).Why do resin 3D prints warp? ›
The problem in 3D printing commonly occurs because the temperature differences between the print layers are too varied. Therefore, creating tension within the printed model, when it becomes too great, lower layers start to drag or lift, creating a warp.What temp does resin warp? ›
On one hand, this can work to your advantage while your piece is drying, but on the other, it can greatly impact your working time: a room temperature above 85F/30C can jump start the curing process, causing the resin in your mixing cup to get hot very quickly and thicken prematurely.How do you fix resin problems? ›
To fix imperfections:
Lightly sand the entire piece and re-pour a second layer of resin on top. The sanding provides some tooth on the first coat so the second layer will adhere properly. It will look a mess until you pour the second layer, and then it'll look great!
- Use a heated build plate. The best way to avoid warping is by using a heated build plate. ...
- Ensure the build plate is leveled correctly. ...
- Apply an adhesive. ...
- Use a brim. ...
- Use a raft. ...
- Adjust the initial layer settings. ...
- Use the fan settings properly. ...
- Use a front-side door.
- Causes of Warping. ...
- Use a heated bed. ...
- Print in an enclosed print chamber. ...
- Choose the right location for your 3D printer. ...
- Turn off the material fan for the first few layers. ...
- Improve bed adhesion with adhesives or a suitable bed surface. ...
- Adjust your slicer settings. ...
- Thoroughly clean your print bed.
The Warping Effect is eliminated by prewarping of the analog filter. The analog frequencies are prewarped and then applied to the transformation.Why do my 3D prints keep warping? ›
3D print warping happens when extruded filament layers on the 3D printer build plate cool too quickly and shrink. This causes the plastic material to contract and pull away from the build plate, resulting in warping (or curling, as it is sometimes known).How can I improve my resin prints? ›
- 1) Choose a fast & rigid resin and fast 3d-printer.
- 2) Layer thickness.
- 3) Reduce amount of bottom layers.
- 4) Reduce wait time.
- 5) Reduce lift distance.
- 6) Increase lift speed.
- 7) Increase retraction speed.
- 8) Choose a less-stick version of FEP film called PFA or nFEP.
In resin-based 3D printing such as stereolithography (SLA), curing is an essential step of the process. In short, curing transforms liquid photopolymer resins into solid geometries.
How do you flatten resin? ›
There is only one way to flatten a resin-coated (those newer photographs that are like plastic) print and that is with heat.How hot is too hot for resin? ›
This temperature range applies to your work area, the resin and hardener components, and the application surface. In temperatures above 85°F, the mixed material will exotherm (heat up) much faster, giving you less time to mix and pour before it starts to set up.Can you heat resin too much? ›
6 Ways to Know if Your Resin is Too Hot
The resin fills with bubbles or foam. Heat from the resin melts your mixing cup. The resin mixture has a shorter pot time than expected. After pouring, you notice excessive shrinkage of your resin casting.
Experiments show that water causes an increase in the cure rate of epoxy materials at low degrees of cure and a decrease in cure rate and total cure at high degrees of cure.Why is my resin wavy? ›
Normal: Mixing resin and hardener together
When you first mix epoxy resin together, you should expect to see wavy resin. Because the two parts of a resin kit are different liquid consistencies, these look like swirls when you mix them together. As you continue mixing them together, these swirls will disappear.
Whether your divots occurred during the pouring process of your countertops, or afterwards due to a soft cure, the solution is always to pour another coat of epoxy. You can pour directly over the previous epoxy pour within 24 hours of the first pour.What are the 4 types of warping? ›
crook: a warp along the length of the edge of the wood. kink: a localized crook, often due to a knot. cup: a warp across the width of the face, in which the edges are higher or lower than the center of the wood. twist or wind: a distortion in which the two ends do not lie on the same plane.What are the three types of warping? ›
The three types of warp are cup, bow and crook.What is the most common cause for warping? ›
Common Causes of Warping
If part of the object's layer cools more quickly — or otherwise at a different rate — than the rest of the layer, it can lead to warping. Warping can also occur when the raw material is too hot. Even if it cools evenly, the hot material may contract in a way that causes it to warp.
There are normally two methods of warping employing different technologies: direct warping or direct beaming (also sometimes known as beaming) indirect warping/sectional warping. Both methods can be used for spun or continuous filament yarns, depending on the circumstances and the quality of fabric to be produced.
What are the different types of warping? ›
Types of Warping:
There are two types of warping are popular in textile industry for preparing warp yarn for power driven high speed looms or hand looms. These are: Direct Warping or Beam warping. Sectional Warping.
This problem occurs when the extruded filament cools too quickly on the build plate and shrinks. This, in turn, creates tension within the model. When it becomes too much, lower layers start to drag or lift up at the corners, creating a warp. Luckily, there are several ways you can keep your prints warp-free.What is the difference between analog and digital filter? ›
Analog filtering involves physical hardware that alters analog signals before they are passed off to other components to be processed. Digital filtering involves passing analog data to a processor that then runs code to digitally filter the data.What is warp distortion? ›
To distort an image, often text, to conform to a variety of shapes. For instance, a line of text can be warped in the shape of an arc or wave. The original text (top) was warped using the Liquify filter with a very large brush size (center), and warped using the Pinch Distortion filter (bottom).What is the warping effect? ›
The warping deformation is an unusual distortion which characterizes thin-walled open section beams. This phenomenon, usually neglected for most of structural elements, appears in presence of transverse loads, in particular if they cause torsional effects.What infill is best to prevent warping? ›
Experiment with the type of infill pattern: honeycomb, grid, rectangle, etc. On my printers I find that a honeycomb infill often leads 80% of the time to warp prints where as rectangular I don't get warping. Hollow out a design. Again related to infill and is beneficial for really large prints.What infill is best to avoid warping? ›
To reduce this stress you need to use an infill that is not in a long straight line Switch to an alternative infill with less internal stresses such as gyroid (Cura) or honeycomb.Why are my 3D prints wavy? ›
The ripple effect on the sides of prints is the result of the vibrations in layers, too high a printing speed, and a displacement in the printing area.How do you fix failed resin prints? ›
When it is happening randomly, there are a few ways to fix this:
- – Increase the exposure time of the regular layers.
- – Increase the wait time before lift.
- – Decrease the lift speed and retract speed.
- – Increase the support thickness.
The warmer resin will cure faster, while the colder ambient temperature will slow down the curing speed. That means that you might need to use longer exposures in winter. In general, recommended room temperature is around 25°C. If your room temperature gets below 20°C, you may start noticing issues with your 3D prints.
How do you make resin prints shiny? ›
If the object is fully dry and clean, you can apply one to three light coats of gloss clear paint on the surface, the number of gloss depending on the spray. Wait the recommended time between the coats to avoid drips, and let your part dry completely to avoid fingerprints.Can you use 70 isopropyl alcohol to clean resin prints? ›
The most common alcohol used for washing resin 3D printed objects is isopropyl alcohol (IPA) and it's chemical formula is C3H8O. Why? It's simple to get just about anywhere and it has withstood the test of time. It comes in 3 different commercially available common strengths: 70%, 91%, and 99%.Should you sand resin 3D prints? ›
Sanding is the first step that you need to do if you want to level up your resin 3D prints. No matter how hard you try, there are always going to be blemishes, support marks, and rough edges left on the resin 3D prints. Sanding takes care of that.What happens if you over cure 3D resin? ›
Yellowing of prints: If you notice that your prints are starting to yellow or get discoloured, then you've exceeded the necessary curing time. Brittleness: A brittle resin print is a sign that you may have left the print in the curing station for too long.How do you keep resin from curling? ›
Let the resin sit for another 2 to 7 days to allow it to fully cure. Allowing the resin to cure a while longer will harden up your piece and prevent the resin from bending. If your piece is thin, a slight bend may be inevitable as the recommended thickness is ⅓ of an inch or more.Do resin prints warp in heat? ›
Sometimes temperatures can reach more than 100 °C (212 °F) and can easily burn your skin. Moreover, the process of “cross-linking” causes unwanted shrinkage and if your part is poorly designed, it can even cause warping of your resin print.How do you fix resin ripples? ›
All you need to do is pop a small amount of epoxy resin over this gap and then allow this to self level and merge with the already curing resin. Imperfections can and do happen, if they do they can usually be fixed so please don't panic.Why do I have waves in my resin? ›
Your resin is cold.
Sometimes, resin components can crystallize when the kit gets too cold. These crystals can show up as swirls or waves in resin.
In general, the recommended resin temperature is around 25–35°C. If your room temperature gets below 20°C, you may start noticing issues with your 3D prints.What happens to resin if it gets too hot? ›
The thermosetting polymer chain starts disintegrating when you apply heat to your resin. The resin softens as the breakdown occurs. You might see it as melting, but what's really happening is chemical disintegration.
What happens if you leave a resin print in the sun? ›
They become more brittle and change color due to the 405 nm light and heat present in sunlight. Formlabs recommends leaving liquid resin in resin cartridges in direct sunlight to naturally cure these materials for disposal.Can you put crayons in resin? ›
Covering your pencil crayon drawing in a coating of ArtResin is easy - in fact, epoxy resin takes pencil crayon drawings next level, sealing and protecting them with a professional looking finish and a glossy sheen that makes colour pop!Can you put fairy lights in resin? ›
Yes, battery-operated fairy lights can be placed inside resin and displayed properly.