3D scanning and printing


This week´s goal was to design and make something that can´t be built on a subtractive way, using the 3D printer, also we had to 3d scan any object to learn the principles of 3d scanning


I´ll start describing the printing part of the assignment:


I didn´t want to design something for my final project on this assignment because I’m sure now that I want to do something different from my first proposal, I want to do something more "fun-interactive-musical", since I wasn't sure yet , I decided to do something I can use, something useful. I wanted to explore some properties of the process, for example I wanted to try designing mechanisms for fixing the 3d printed pieces to other material like acrylic I also wanted to explore the 3D printing's ability to print mechanical objects in 1 print with no assembly required testing the tolerances.


I decided to design a guitar string winder, it was small enough (fast print), useful and also was a good exercise for experimentinrtg with tolerances and moving parts. I decided not printing the handle, and laser cut that part for saving some printing time on the machine. I used Inventor for modeling the piece and exporting it to STL format. This was mi final design.







Once I was happy with my design I used a Makerbot for printing the object, my first attempt failed because the clearance was to small 0.25 and the support was getting stucked between the pieces, in the second attempt I used a 0.5mm clearance but it failed to because the axis was to thin and it broke, finally at the third attempt I got a successful print, I removed the support material and there was motion between the two pieces.





I noticed that depending on the orientation of the piece, the machine can have some problems building curves, and the faces in contact with the support material won’t have a good and smooth finish likethe other faces




I removed the small clips of the acrylic because they were too fragile and finally they weren’t necessary. This is the finished product:






Here is a video that demonstrates how it works:



3D scanning


Sacnning was kind of hard for me, i failed alot of times, i used the NextEngine 3d Scanner that we had in the lab. Here is a tutorial (in spanish) for the scanner.




I had problems with dark objects and shinny objects. using talcum powder over the objects helped on the scanning.






Finally i scanned a "kazoo" from a friend in the lab. and it was better because its surface was more opaque.




I set the scanner to divide the whole turn into 10 steps, after that i joined the faces and i got the model.









I played a little with Mesh Lab traying to clean and fix a little the model.




i fixed the holes and simplified the mesh by using the quadric edge collapse decimation fillter.




I rendered the model on Keyshot 5 for having and idea of the quality of the scann.



Here is the STL file of the scann.