Suspender Button w/Recessed 4 holes

thingiverse

This is a 2.5mm thick, 20mm diameter, four holed button for use with suspenders that attaches securely. The edges are curved, making this buttons a reliable replacement for otherwise expensive injection molded ones. The center is also indented, so the threads used to attach the button are flush with the top of the button. Standards NGSS Overview and Background Requirements Having printed hundreds of buttons, and using them to attach my own suspenders to my pants and shorts, this button is the 3rd generation of designs. While you might think buttons are fairly straightforward to locate on sites like this one, it is not. So, I encourage you to give these a try. To make these, it is strongly recommended that a strong nylon filament is used. PLA is far too brittle for this application. ABS may be a possibility, but it is more difficult to print than Taulman 3D Bridge Nylon or Alloy 900. Lesson Plan and Activity Step 1: Initial Ingot Create a 10mm radius circle within FreeCad, selecting the center point of the axes as the circle reference root. Pad this circle to 2.5mm. Step 2: Button Hole Generation Using one of the circle faces as a reference for a new sketch, and the axes as root references for the button holes, draw a 1.5mm radius circle on each axes approximately 3mm from the center reference used to create the original button ingot. Use dimensioning (non-construction) lines to ensure these circles are 2.5mm from the center root point. Pocket these holes 2.5mm to create the threading holes. Step 3: Recessed Center To hide the threads used to attach these buttons, draw a 2.7mm radius circle on one of the circular faces, referencing the same root point used to create the original button ingot. Pocket this circle 0.9mm. Step 4: Smoothing the Edges Select the large outer edges of each circular face of the button, and use a 1.3mm fillet to round the edges. This completes the part. Step 5: Printing As noted in the background, use a nylon filament to print these buttons. The nylon material such as Taulman 3D Bridge or Alloy 900 produce durable buttons that can be colored to any tint you prefer. Materials Needed FreeCad, strong nylon filament, computer, and a 3D printer.