<p>The bubble will contain air, but this will vary by printer. Most resin printers lift the printed part out of the bath slightly after each layer. Some printers, however, don't lift the piece completely out of the bath. This will cause the resin to become entrapped. Once those entrapped pockets of resin are exposed to light, they will also undergo photopolymerization. It may be possible however to program those printers to lift the part completely out of the resin for each layer.</p>

CC BY-SA 4.0
2020-09-06T09:57:30.767Z
actually, due to how easy it is and speeding up the print, these days **most** don't lift it out of the resin vat but just raise it enough to separate it from the build surface. However, it's just a modification of the g-code increasing the raise it over that threshold... or the firmware.
Trish
CC BY-SA 4.0
2021-05-08T17:35:08.883Z
Some (all?) slicers allow you to control the lift distance. If you put a lift that's higher than your vat depth, you'll get the part out of the resin bath completely every time, at the expense of a huge increase in print times.
Diego Sánchez
CC BY-SA 4.0
2020-08-06T20:10:27.100Z
2020-08-06T20:10:27.100Z
user77232
<p>I have no prior experience with stereolithography 3D printers.
For a research application I am considering the SLA approach but I have a more basic question.</p>
<p>I would like to use SLA in order to print porous structures from ice cores. Using X ray tomography I have raw data of very high resolution 3D images of the cores. The idea is to use this information in order to print representations of these cores to perform a diffusion study.
Some of these cores come from depths below 50 m thus the snow has compacted in such way that volumes of air are occluded.</p>
<p>My question is if it is possible for SLA printers to print in such enclosed volumes. Imagine for example a solid cube with a gas bubble in the middle. Is that possible for an SLA printer and if yes will the bubble contain air or the liquid resin of the printer?</p>

CC BY-SA 4.0
2020-08-05T19:36:23.113Z
I like your question.  I don't have an SLA printer.  It is somewhat unnatural to have enclosed volumes in an SLA printer.  It could be either filled with uncured resin, or, if the size of the opening, the viscosity of the resin, and the draining time per layer are right, perhaps partially filled with air.  "Partially" because uncured resin will stick to the inside.  It might be later cured in the UV soak process, but I think you lose control of the geometry.
cmm
CC BY-SA 4.0
2020-08-06T15:53:02.450Z
@cmm here is a video of a scan, where you see white think void, black is filled solid material (in the real case ice and in the #D printer case plastic)
https://youtu.be/oTDOVxpl6PU
VG_nbi
CC BY-SA 4.0
2021-01-03T22:37:41.510Z
VERY related: [Why is cupping bad in SLA prints?](https://3dprinting.stackexchange.com/questions/13988/why-is-cupping-bad-in-sla-prints)
Trish
CC BY-SA 4.0
2021-01-04T08:55:56.267Z
@Dr.MantisTobbogan - Finally, I posted a [meta post](https://3dprinting.meta.stackexchange.com/q/500/4762) on some editing guidelines.
Greenonline
CC BY-SA 4.0
2021-01-05T18:40:09.330Z
yes..but.. practically you'll want to add a pair of vent holes to let the fluid escape (one for air one for fluid) you can have a large void in the print, but you'll need some post-processing to deal with it. You'll first have to drain the bubble, then clean it, then fill it with the gas you want, then seal it. I can't think of a simpler way, but there might be?
Diesel
<sla><resin>
Enclosed volumes with stereolithography 3D printers
VG_nbi
# Enclosed volumes with stereolithography 3D printers

(Asked by: username_0 on 2020-08-05)

I have no prior experience with stereolithography 3D printers.
For a research application I am considering the SLA approach but I have a more basic question.

I would like to use SLA in order to print porous structures from ice cores. Using X ray tomography I have raw data of very high resolution 3D images of the cores. The idea is to use this information in order to print representations of these cores to perform a diffusion study.
Some of these cores come from depths below 50 m thus the snow has compacted in such way that volumes of air are occluded.

My question is if it is possible for SLA printers to print in such enclosed volumes. Imagine for example a solid cube with a gas bubble in the middle. Is that possible for an SLA printer and if yes will the bubble contain air or the liquid resin of the printer?

**Tags:** sla, resin
> **Comments:**
> **username_1**: I like your question.  I don't have an SLA printer.  It is somewhat unnatural to have enclosed volumes in an SLA printer.  It could be either filled with uncured resin, or, if the size of the opening, the viscosity of the resin, and the draining time per layer are right, perhaps partially filled with air.  "Partially" because uncured resin will stick to the inside.  It might be later cured in the UV soak process, but I think you lose control of the geometry.  
> **username_0**: @cmm here is a video of a scan, where you see white think void, black is filled solid material (in the real case ice and in the #D printer case plastic) https://youtu.be/oTDOVxpl6PU  
> **username_2**: VERY related: [Why is cupping bad in SLA prints?](https://3dprinting.stackexchange.com/questions/13988/why-is-cupping-bad-in-sla-prints)  
> **username_3**: @Dr.MantisTobbogan - Finally, I posted a [meta post](https://3dprinting.meta.stackexchange.com/q/500/4762) on some editing guidelines.  
> **username_4**: yes..but.. practically you'll want to add a pair of vent holes to let the fluid escape (one for air one for fluid) you can have a large void in the print, but you'll need some post-processing to deal with it. You'll first have to drain the bubble, then clean it, then fill it with the gas you want, then seal it. I can't think of a simpler way, but there might be?  

---

## 1 answers

### Answer by username_5 on 2020-08-06. Score: 1

The bubble will contain air, but this will vary by printer. Most resin printers lift the printed part out of the bath slightly after each layer. Some printers, however, don't lift the piece completely out of the bath. This will cause the resin to become entrapped. Once those entrapped pockets of resin are exposed to light, they will also undergo photopolymerization. It may be possible however to program those printers to lift the part completely out of the resin for each layer.

> **Comments:**
> **username_2**: actually, due to how easy it is and speeding up the print, these days **most** don't lift it out of the resin vat but just raise it enough to separate it from the build surface. However, it's just a modification of the g-code increasing the raise it over that threshold... or the firmware.  
> **username_6**: Some (all?) slicers allow you to control the lift distance. If you put a lift that's higher than your vat depth, you'll get the part out of the resin bath completely every time, at the expense of a huge increase in print times.  

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