Resin, also known as polyester or epoxy, is a two-part liquid polymer that hardens when it’s heated. The resin comes in different formulations and viscosities—some are thicker than others—but all serve the same purpose: to set during the 3D printing process.
The benefits of using resin over other materials are many; it allows for more intricate models, more detailed designs, and smoother surfaces. However, while resin is easy to use once you know how to mix it up properly (and we’ll get into this soon), many people struggle with knowing whether it has been mixed properly before they begin their prints.
How do you know when resin is mixed?
Mix the resin for 1-2 minutes. If you’re using a different container for mixing, take your time to make sure that it’s thoroughly mixed. Look for a uniform consistency—like pancake batter, but thicker.
What happens if you don’t mix resin properly?
If you don’t mix your resin properly, it can have a number of negative effects. For example:
- You may not get the right property from the resin. This could include hardness, strength, and toughness.
- The bubbles in your resin will weaken it and affect its durability as well as its transparency and color quality.
- You’ll waste money on extra materials (including waste), which means higher costs for you down the road! Not only do you have to buy more raw material but also more time spent mixing them together – time that could’ve been spent on curing instead!
What happens if you over mix resin?
If you over mix the resin, air bubbles will form and the resin becomes less viscous. This can cause a number of different issues with your finished project:
- The pot life may be reduced.
- The resin might be more prone to shrinkage or curing too fast.
What should be the consistency of resin?
Viscosity is an important factor in resin mixing. If the resin is too thin, it will not cure properly. If it’s too thick, it will not cure properly.
The viscosity of a resin depends on both the type of resin and ambient temperature (resins with low molecular weights tend to be more viscous at lower temperatures).
What does resin feel like when dry?
Resin can be a wonderful medium for all types of jewelry, especially when you’re just getting started.
Whether you’re making beads or other small items, there are some general rules that will help you get the best results from your resin project.
One important thing to remember is that when dry, most resins have a hard and brittle texture with no stickiness at all.
When mixed with plasticizers (such as polyurethane or epoxy), they become more flexible and sticky – but if too much plasticizer is added, the material will bend instead of breaking under pressure.
Can I mix SLA resins?
Mixing SLA resins is a bad idea. SLA resins are designed to cure quickly, and combining them with FDM will ruin the finish and make it more difficult for your resin to cure correctly.
If you have any leftovers from a previous printing session, don’t mix them with new resin—just throw them out!
Why is my resin sticky after curing?
The resin might not have been exposed to UV light for long enough. If you’re using a UV curing light, make sure it creates a uniform space for the resin to cure in.
If you’re trying to use an LED curing system, make sure your lights are powerful enough and placed directly on top of the piece so that they don’t have to travel through too much space before reaching the resin.
If you’re using an LED curing system and have moved the parts around in order to get them into place (or if your pieces were just not properly aligned), this might cause some issues with how well they cure together since their exposure time is less than ideal.
Why is my resin bendy after a week?
If your resin becomes flexible after a week, it is most likely because of one of the following reasons:
- Too much hardener is added to the resin. In this case, you should add more hardener and mix until it becomes completely clear. If you do not want to use more hardener, you can try adding more resin and mixing again until it becomes completely clear.
- The reaction has not occurred properly (this happens when there are air bubbles in your mixture). To fix this problem, use a straw to blow out any air bubbles before mixing together with another batch of resin/hardener mixture.
- The mixture was mixed for too long or at too high a temperature.* Over-polishing or using too thick layers that require extra work will cause an incomplete reaction.* Overuse of pigment can lead to an incomplete reaction as well.* Using too much opaque pigments such as Black Pearl Pigment can cause staining on surfaces where they were applied because they do not fully dissolve like transparent do when mixed into liquid mediums like resin or acrylic paints; therefore they remain floating around until removed via mechanical scrubbing techniques such as sanding away any excess particles left behind after painting over them with another layer (which may be difficult if one needs precision details).
If you really want to know if your resin is mixed, the best way to tell is to rub some on your finger and taste it. If you can’t do that, try looking at the surface of the resin for signs of bubbles or foam. If there are bubbles or foam, then the resin has been mixed properly and won’t need further stirring.
After reading this article, I hope that you have a better understanding of what epoxy resins are and how they work!