In order to counteract the weight of the quadcopter while measuring pitch and roll values the test stand was printed with variable infill. The steps to complete this process for the _Ultimaker_ 3D printer are documented below.
# Setup
Before you can start printing the test stand you must download the "test stand pitch&roll" and "printing infill overlap block" STL files from this repo and download the Ultimaker Cura software which can be found for free on Google or using this link. [Ultimaker Cura Software](https://ultimaker.com/software/ultimaker-cura)
# Loading your components into cura
After opening the Ultimaker Cura you will want to load the two files that you downloaded using the folder button here.
If the models load successfully you should see both the test stand and a large block appear on the virtual print bed. If a model is greyed out and striped it means that it is currently outside the boundary of the print bed, it is not an issue and we will fix it in the next step.
Before you can position the components you will want to open the preferences tab at the top of the Cura screen and select configure cura. In this menu, you will want to find the setting "Automatically drop models to the build plate" and ensure that it is disabled. This will allow you to lift the block up off the print bed to position it where you want to.
Now we can use the movement controls on the left side of the screen to move the test stand model into the print bed boundary, setting it to 0,0,0 coordinates is always a good option. You will then want to position the block so that it overlaps the lower half of the test stand legs as seen here. A z-coordinate value of 55 is a good place to start.
Now, all we need to do is change the infill settings for the models. It is important that during the next step you have the large block selected. Hover over the menus on the left side of the window and select the "Per Model Settings" menu then select the "Modify settings for overlaps" submenu within the popup menu. This will cause the Cura software to no longer treat the block as a separate printed object and instead treat it as a boundary that will allow the test stand to have different infill settings wherever it overlaps the block.
Now that we have the block setup as an overlap boundary we simply need to specify what we want the infill to be where the objects overlap. To do this click on the "Select settings" button in the menu that is currently open and select the "Infill Density" option. This will add a new field to the menu you have open that will allow you to specify how dense you want the infill in overlapping sections to be. Set this infill value to 90%
Our models are now positioned and configured correctly so we can get ready to print our test stand. To verify the print settings click on the print settings bar near the top right of the screen to view the values for the print detail, the infill density for non-overlapping sections, support settings, and adhesion settings. It should look as follows, if it does then you can go ahead and click the slice button in the bottom right of the screen.
Once the Cura finishes slicing the model you can feel free to save it and use the file to print the stand. If you click on the preview button at the top of the screen and drag the layer viewer on the right side of the screen down you will be able to see that the thick legs have a much denser infill than the rest of the stand, this is because the large block we used only overlapped the stand in those areas and allowed us to print using two different infill values.
