Yumbox replacement latch

thingiverse

<h1>Yumbox replacement latch</h1> Yumboxes are a neat little lunch kit for kids, with one major downfall: their weak latches. Our boys (5 and 3 at the time of design) have each broken the latches of more than one Yumbox. As these boxes are rather expensive, I set out to design a replacement latch that I could print. The problem being, how on earth do I secure the new latch into the Yumbox when I am done? This design makes use of 2mm diameter finishing nails as the "axle" or pivot, and a slot in the latch design that allows "extending" the cut-down nails into the box receiving holes (in the lid). This design was chosen because the only way to print the nails into place would have required laying the latch down parallel to the print bed which would make the design FAR less resilient in use (i.e. the layer lines would be in the worst-case orientation). Be sure to use stainless steel finishing nails, or pins of 2mm diameter as they fit perfectly in the Yumbox lid. The ideal length of the pins would be approximately 20mm No real effort was made to optimize the design for parametric use. I used b-splines for the side profile and constrained the sketch in a relatively crude manner. That being said, the key values are referenced by spreadsheet and should not need any changes (in theory). FreeCAD (design parameters) spreadsheet setup: <ul> <li>All values can be edited.</li> </ul> The design was done in FreeCAD and as mentioned it is fully parametric. I have included the FreeCAD file so that you can modify the design to your heart's content. I am open to any suggestions as to how to improve the design work-flow in FreeCAD.