From b4ab7262932fca778264ea42a9d3304e5d22ce9f Mon Sep 17 00:00:00 2001 From: Sam Hos Date: Wed, 26 Feb 2025 10:23:26 +0100 Subject: [PATCH] docs about strength testing bricks --- .../3D_Printing.md | 26 +++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/docs/Assignments/week_5_3dprinting_and_scanning/3D_Printing.md b/docs/Assignments/week_5_3dprinting_and_scanning/3D_Printing.md index 93fbdf5..7fa7321 100644 --- a/docs/Assignments/week_5_3dprinting_and_scanning/3D_Printing.md +++ b/docs/Assignments/week_5_3dprinting_and_scanning/3D_Printing.md @@ -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.