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docs about strength testing bricks

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Sam Hos
2025-02-26 10:23:26 +01:00
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docs/Assignments/week_5_3dprinting_and_scanning/3D_Printing.md
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@@ -53,13 +53,13 @@ The test object. Im going to hold it on a Table and put on weights till it break
The python script is really easy to use. You need to run it in the cli and give it a path to a file and then it will convert it.
```bash
python3 bricklayers.py -extrusionMultiplier 1.2 test_1h21m_0.08mm_205C_PLA_ENDER3.gcode
python3 bricklayers.py test_1h21m_0.08mm_205C_PLA_ENDER3.gcode -extrusionMultiplier 1.2
```
### The prints
#### With planar infills
The first one I printed with an extrusionMultiplier of 1.6x.
```bash
python3 bricklayers.py -extrusionMultiplier 1.6 test_1h21m_0.08mm_205C_PLA_ENDER3.gcode
python3 bricklayers.py test_1h21m_0.08mm_205C_PLA_ENDER3.gcode -extrusionMultiplier 1.6
```
Infill settings
@@ -93,6 +93,28 @@ With this print I increased the raft. It helped a bit but at some point the prin
![alt text](IMG_8383.jpg)
### Testing the strength
To test the strength I made a makeshift setup with a scale on a hook. Then I put the plastic test subject on the bar and pulled really hard until it broke. Then I could read the amount of kg needed to break it from the scale.
![alt text](IMG_8421.JPEG)
I made 3 prints. One normal using normal settings. One with brick using `Bricklayers.py` and one using `bricklayersNonPlanarInfill.py` using the commands above.
![alt text](image-15.png)
This is the end result. At the bottom are all the failed prints. At the top are the finished and tested prints. On the left there is the `bricklayers.py` print. The 2 in the middle have no modifications. The one on the right has the `bricklayersNonPlanarInfill.py` modification. The 2 on the left broke in the middle at the same point. Of the left one I got a measurement of 27,75kg. The one in the middle and right I didn't get the measurement because my phone couldn't record the screen of the scale. That's why im doing them again.
| Which Print | Force down needed to break it |
| :---------------------------- | ----------------------------- |
| No modifications | 24Kg |
| Planar infill bricks | 27,75Kg |
| Non planar infill with bricks | 31,4Kg |
I also noticed that the non planar infill broke at the same point twice. It could be because the print was getting unstable up there. Because the print failed a couple of times at that point when I was printing it without a solid platform.
![alt text](IMG_8462.JPEG)
So if it was more stable during printing it may have been even stronger.
## Creating something that can't be made subtractively
I wanted to make something simple because my University has been giving a lot of assignments to do during my internship. So I wanted to focus on that. I created a cube with a hole in it and in there another hole on another axis. That way it can't be made subtractively.