Nevertheless, it is difficult to state exact reasons why that happens. Moreover, we’ve discussed and re-confirmed that absorption of liquid may be a reason behind this surface cracking effect with professors at the faculty of chemical technology of Kaunas University of Technology. So we concluded that effect might be a reason of physical and not chemical alteration. All in all, our research showed that there were no obvious changes in chemistry of those samples. It covered various samples that IPA has affected. It is also worth mentioning that we have executed FTIR analysis for this issue. Therefore, this shrinkage results in severe cracks and damage to surface as polymer network is not able to recover to exactly the same original structure. But when you take your part out of IPA, absorbed liquid evaporates and polymer network tends to shrink and go back to its primary shape. During swelling cross-linked network of polymer expands. This absorption causes SLA 3D prints to swell during cleaning. Absorption increases because of soft surface of fresh 3D prints as softer materials tend to absorb surrounding liquids a lot easier. The longer we keep our models in IPA solution, the more IPA they absorb. After 3D printing, we wash our prints in IPA. Such absorption phenomena is also inevitable in cleaning procedure of SLA 3D prints. So the longer you keep it in liquid, the more it will absorb it. How much will be absorbed depends on many factors, but the key point is that absorption will happen no matter what. In chemistry it is well known that if you submerge something hard/solid into something liquid, it will absorb that liquid. Theoretical reasons of surface damage Absorption In the worst case scenario 3D printed object can quite easily break right in your hands without even applying serious stress. Sometimes we call it desert-like surface. Cracks are deep and even inner parts usually look damaged. Surface typically looks chapped or even wrinkled. It is also interesting that this shrinkage has its specific looks. All in all, as IPA is a standard cleaning solution for 3D printed objects, in this article we will focus only on IPA.
We have also noticed similar shrinkage when washing 3D printed objects with tap water, but level of damage was different. It is caused by IPA which we use when washing and rinsing. If you or someone you know could benefit from a product like IPA to help clean the resin from their 3D printers, you can view some of our available products for you here.The type of shrinkage we are interested in this experiment is completely parasitic. While some of the uses are more at a higher level than personal, IPA can be used to clean all the different types of 3D Printers that produce these many products.
3D printing is a very tedious process that requires some clean-up when it is done.
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