13 Fixes for Cracked or Split Resin 3D Prints

Resin 3D Printers have their challenges, and something I’ve particularly observed is the tendency for resin 3D prints to separate or fracture. It’s a major factor affecting your print’s final appearance. So, I dove deep into methods to rectify resin 3D prints that encounter this dilemma.


To mend resin 3D prints that show signs of separation or fractures, ensure you remove any residual uncured resin by making your models hollow and creating ample outlets for the resin to escape. Make sure you employ a satisfactory regular exposure to prevent prints from becoming fragile and underdeveloped. Always ensure appropriate curing of your model, and maintain a robust wall width.

That’s a concise solution, but there’s so much more to explore! Continue scrolling for more in-depth insights.

What Makes Resin Prints Separate or Break?

Rectifying Resin 3D Prints that Separate or Fracture:
1. Hollow the Prints with Sufficient Outlet Holes
2. Wash the Prints Thoroughly & Remove All Liquid
3. Implement an Adequate Wall Width
4. Boost Regular Exposure
5. Guarantee No Leftover Residue in Resin
6. Opt for Flexible Resins & Sidestep Water Soluble Resin
7. Detach Supports Prior to Curing
8. Bypass Excessively Slender Parts
9. Refrain from Extensive Immersion in Isopropyl Alcohol
10. Abstain from Over-Curing the Model
11. Choose Bigger Layer Dimensions for Enhanced Durability
12. Settle on the Best Component Alignment
13. Bore Openings in the Model to Remove Resin

The primary reason for separations or breaks in resin prints arises from the retention of uncured resin within the model. Photopolymer resin, employed in 3D printing, undergoes an exothermic shift, meaning it releases heat and swells when it solidifies. This results in mounting pressure within the model, which, over a period, can cause the model to break open and possibly burst.

To simplify, let’s enumerate several reasons a resin print might show signs of separation or fracture:
– Residual uncured resin internally
– Not adequately hollowing models
– Inadequate or too small drainage holes
– Soaking the print in isopropyl alcohol for extended periods
– Resorting to subpar, water-soluble resin
– Insufficient or excessive curing duration
– Printing components that are too slender
– The alignment of the print resulting in fragile sections

Comprehensive Remedies for Resin 3D Prints that Separate or Fracture:

1. Hollow the Prints with Sufficient Outlet Holes:
– Often, your prints don’t require to be chock-full of solidified resin, saving you some resin. Once hollowed, it’s essential to know where to position sufficient drainage outlets to prevent trapped resin.

2. Wash the Prints Thoroughly & Remove All Liquid:
– After figuring out how to hollow your models, ensure you have an impeccable cleaning process. I employ the Elegoo Wash & Cure Plus to clean my resin creations.

3. Implement an Adequate Wall Width:
– The model’s sturdiness is a pivotal factor. Your wall width plays a crucial role in enhancing the print’s resilience.

It is my sincere hope that this guide furnishes you with the knowledge and strategies to tackle any issues of separations or fractures in your resin creations.