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Prototype Concept: The prototype was developed using Elements E and F. The design is 3D printed to ensure ease of fabrication and attention to detail. The Pen is based off the bottles that were sent with the spray nozzles, with a rind added onto the bottom for the brush to be attached to. The thickness of the Pen and other dimensions use element E to make sure they are the correct thickness.
Prototype Build Procedure: The prototype is built from ABS plastic using a 3D printer. We first created a test print to find the tolerance of the 3D printer. Although the tolerance looked close, we were unable to see whether the 1 mm difference was enough, due to one circle being printed as an octagon and one print as a decagon. After sanding, they were nearly able to fit together well, and with a bit more sanded would have provided a nice pressure fit between the two pieces. The actual prototype was then printed using the same printer, and after some minute sanding, the Pen and the caps fit together well
Here we begin our first testing of the 3D printer to see if we can print a base with a properly fitted cap. This first test did not come out as planned but in the course of only a couple days tough us a lot about the 3D printer that we were working with.
Layne File 4-9-19.pdfAs we moved towards creating a functioning prototype we had to refine the quick sketches that we had in our journals to a final plan and then some drawing that get more specific and contain dimension. These dimensions were obtained by modeling a sprayer that we ordered and creating a bottle and caps that would fit around it. These dimensions allow us to 3D model the device and print it out with ABS plastic.
The first 3D test print. It has been sanded a bit to help them fit together better, due to the parts that fit together not being printed as circular. The top of the “pen” has broken off, showing that the 3d print must be a bit thicker in that region. It also broke due to part of the top being printed with support material, which was removed soon after the print was completed, resulting in it being less secure.
The spray bottles the base of the pen is being modeled after. One of the bottles has been cut in half to better understand the inner dimensions of the bottle, and an untouched bottle stands in the background.
Prototype Construction: The prototypes’ bodies are created by 3D printer, so they are able to have great amount of detail. That being said, the 3d prints must be watched for misprints, and fixed before they further wreck the print or restarted entirely. The final product will be watched meticulously to guarantee that it is free of defects. The spray caps, ordered from packagingdirect.com, will be added to the head of the bodies, and the microfiber brush, which has been manufactured by hand, will be added on. The caps, which have also been 3D printed, will then be applied to either end. The pen will then be tested on various lenses, and evaluated through the criteria listed in Element D.
Aesthetics: The pen is designed to be mistaken for a regular pen, and while the original prototype may look a little bulky, it will be refined in later iterations to more nicely match a normal pen. The printer is only able to print in one color, so extra color must be added on post-print. The logo must also be added post-print.
The sprayer nozzle being used to dispense the cleaning solution from the Pen
The prototype after coming out of the printer, consisting of the Pen and a cap on either end. The pen is surrounded by support material that will be removed.
The Pen being cleaned of the support material. The support material, while partially water soluble, must be scraped away after being allowed to soak in water. After being scraped away, the Pen is almost ready to be used to test.
The drawings of the Pen and caps on CAD. The Pen is 2 mm thick and 100 mm tall. The caps are designed to fit on the bottom of the Pen, where the brush is located, and over top the spray nozzle once attached. The threads were CADed using the coil function of Autodesk Inventor.
The pen after the support material has been removed. The spray nozzle is attached to the top of the pen, although the brush has not yet been added. The caps fit over the pen on either side, protecting the brush from being bent and preventing the spray nozzle from firing. The caps also fit over one another so that they do not need to be held while cleaning the lens.
The brush, before being cut to size and added to the pen. The brush consists of microfiber cloth stitched on top of bristles of a dental brush
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