added extra docs 3d printing

docs/Assignments/week_5_3dprinting_and_scanning/3D_Printing.md

@@ -92,6 +92,9 @@ Getting good prints on nonplanar infill is a lot harder than planar infill becau
 With this print I increased the raft. It helped a bit but at some point the print got loose from the raft. Here are all the failed bricklaying prints.
 
 ![alt text](IMG_8383.jpg)
+First I increased the brim size of the print but that also didn't work out. After that I used a cube as base and let it stick out 5mm above the build plate like this.
+![alt text](image-18.jpg) 
+So I have a even bigger and stronger raft. After the print I knocked the small little platform off with a hammer and then I had a print I could test.
 
 ### 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.