P19037: Skreppa Modular Shoe
/public/

Customer Handoff & Final Project Documentation

Table of Contents

Team Vision for Final Demo and Handoff

What did your team plan to accomplish during this phase?

Our team planned to integrate all systems to build a functional prototype for the upper and lower pairs of shoes. With this, we will be able reasonably to create two functional prototypes to meet our goals of the project. We will also be completing the lightning pitch, technical paper, and Imagine RIT poster.

What did your team actually accomplish during this phase?

Our team completed our lightning pitch, Imagine RIT poster, and a technical paper. The team submitted a PRP in order to have this project continue with another group of MSD students next year. We also constructed a final pair of low cut uppers and a final pair of high top uppers with a sliding mechanism to integrate these with the outsole. We finalized the design for our front elastic joining mechanism and 3D printed custom hooks to completely integrate the upper and the outsole. We began working with flexible 3D printing as the tools became available. We created files to print a hiking outsole and have been quickly adapting to issues causing prints to fail.

Final Hiking Boot Uppers

Final Hiking Boot Uppers

Final Hiking Boot Uppers

Size 8.5 womens high top uppers constructed of sustainable materials without the use of harmful apoxys. These components feature an extra layer of water resistant lining and reinforced heel.

Final Lower Cut Uppers

Final Low Cut Uppers

Final Low Cut Uppers

Size 8.5 womens low cut uppers constructed of sustainable materials without the use of harmful epoxys.

Final Flat Bottom Outsole

Final Flat Bottom Outsole

Final Flat Bottom Outsole

For the flat outsole of the Skreppa shoe, we decided to stay true to our roots and recycle an outsole from a pair of well-loved shoes. This process included separating the upper from the outsole, using a dremel to carve out the back heel where a mechanism will sit, and ensuring the overall rigidity of the outsole will stay in tact. From this, we lined the heel of the shoe with aluminum foil in order to mold the Instamorph plastic around the contours of the shoe. The aluminum foil, we found, does not stick to the Instamorph and allowed us to make a few iterations of reheating the plastic to fit the shoe well. Once the instamorph was formed, a 3D printed, PLA slider was placed onto the Instamorph, bonding them permanently. Once that portion was smoothed out, the aluminum foil was removed and the Instamorph was reheated once again. The hot Instamorph and slider combination will adhere to the outsole permanently, creating one functional unit.

Final Hiking Boot Outsole

Final Hiking Boot Outsole with mechanism integration

Final Hiking Boot Outsole with mechanism integration

Final Hiking Boot Outsole with mechanism integration

Final Hiking Boot Outsole with mechanism integration

Final Hiking Boot Outsole printed with flexible material from the Construct

Final Hiking Boot Outsole printed with flexible material from the Construct

In order to signify the future iterations of the Skreppa shoe, we wanted to 3D print our own outsole. This began with our design in Creo. The outsole shown above was designed to house two elastic cords that will reach out over the toe and connect onto the uppers. Additionally, the heel and base of the foot features channels that would allow water, mud, and dirt to flow out with each step. Finally, this outsole would already have the sliding mechanism built-in to reduce any headaches with manufacturing.

The team was contacted by Mike Rufflin at the Construct about utilizing their brand new Stratasys machine that was capable of printing flexible material. Obviously, we took the opportunity and ran with it. After a few failed iterations from trying to print on our own with NinjaFlex Cheetah, this machine was able to print our outsole in flexible TPU. Ultimately in order to make one of these, it takes upwards of 24 hours to print and cure - however, creating an outsole from virtually nothing.

Final Toe Attachment Hooks

Final Toe Attachment Hooks

Final Toe Attachment Hooks

The sliding mechanism that was featured prominently throughout this design process was not the only form of attachment we are featuring with the Skreppa. While the slider allows for the heel and the arch to be properly adhered, we knew that there would be concerns of the toe and front of the shoe. As shown above in the hiking outsole, we are featuring two channels that will house elastic cord, held in mechanically with stops. These will reach out over the toe of the shoe and will have male hooks attached on each end. These hooks will reach up and over the toe of the shoe and latch onto the female hooks that are located on the lowest portion of shoe lace on each upper. This ensures that the user can swap out components interchangeably without worrying that their shoe will fly off.

Risk and Problem Tracking

public/Final Documents/Risk 1.JPG
public/Final Documents/Risk 2.JPG
public/Final Documents/Risk 3.JPG
public/Final Documents/Risk 4.JPG

The final spreadsheet can be found here.

Problem Tracking

Problem Tracking

The final spreadsheet can be found here.

Final Project Documentation

Technical Paper

The final iteration of our technical paper can be found here.

Final Poster

Final Technical Poster

Final Technical Poster

A PDF file for our final poster can be found here.

CAD Model & Assemblies

Below you will find links to the STLs of the outsole design that we generated. These files include the slider mechanism, the outsole that we designed with flexible material in mind, and the hooking mechanisms that adhere the toe.

Slider

Outsole

Female Hook

Male Hook

Final Bill of Materials

Final Bill of Materials

Final Bill of Materials

The final spreadsheet for the Bill of Materials can be found here.

Manufacturing and Assembly Instructions

During the construction of our upper, we created a step by step guide to easily replicate the process that we used. The guide can be found /public/Final Documents/Sewing Upper Guide.pdf|here]].

Recommendations for future work

More time with the flexible 3D printing will allow further improvement for outsole. Creating a design that works with the less expensive Ninjaflex TPU in order to bring cost down. Testing and verification of strength, comfort, and durability. The team could also look at scalability of design in order to make different shoe sizes.

Functional Demo Materials

Plans for Wrap-up

Preparing For The End

Our team needs to clean up our space next to the construct to make room for new teams. We will need to make decisions on what is useful to hand off to the next team and what is just taking up space.

Imagine RIT

This week our team will prepare to present at Imagine RIT. We will present the poster we finished earlier this gate along with our functional prototypes. In order to have this done we hope to print another outsole to have a pair.

Lightning Talks

We will be presenting our lighting talk to share with our classmates what problem we are addressing, our team mission, the solution we came up with, and our final results. We will be giving this presentation live. You can view the slide here.


Home | Planning & Execution | Imagine RIT

Problem Definition | Systems Design | Preliminary Detailed Design | Detailed Design

Build & Test Prep | Subsystem Build & Test | Integrated System Build & Test | Customer Handoff & Final Project Documentation