Emergency Stop "Mushroom" Push Button

thingiverse

This is a fantastic emergency stop mushroom button that can be placed above any switch, making both safety and aesthetics a priority for your machine. There are three ways to utilize this model: You can use the entire model as-is; the box is designed to hold a 170-points solderless mini-breadboard with a button in the middle. There's even a hole for the wires going into the box (in the picture, you can see the breadboard, but there's no button on it because I ran out of buttons and I'm waiting for a new batch from China). You can also incorporate the panel into your design; in this case, you don't need to print the box. Alternatively, you can simply copy the holes from the panel into your own panel; in this case, you don't need the box or the panel. When fully pressed, the button reaches 13.4mm behind the panel (when the panel is 1.4mm thick). Safety note: This is just a fancy cover for a momentary push button; it's your responsibility to ensure that your machine stops when someone hits the big red stop button. Printing instructions: All parts are printed in PLA (except for the spring, which is PETG - ABS also works) with 1.2mm shell, 1.2mm top/bottom, and no support. The estop box walls are thick but print just fine when hollow; print with no infill. The estop panel and estop cover are all basically all shell; infill makes no difference. The estop pin should have at least three shells to make it solid since it shouldn't be exposed to any sideways pressure. It can work just fine with no infill or you can be extra careful and use 100% infill - either way, it doesn't matter much because it's small and won't use much material. I printed mine with 10% infill because I wanted to print it together with the button. The estop button looks much better when under-extruded a bit; I printed mine at 95% flow. If the letters "STOP" on the front are too thin and not visible, you need to reduce your flow (or extrusion multiplier) some more. The button should work just fine with no infill (the important part on the back is built on top of the shells of the "STOP" text and not on a bridge); but I printed it with 10% infill to make it stronger. If you have problems with platform adhesion, use a raft instead of a brim for the button. The stop spring is the only part that wasn't printed in PLA because I don't trust PLA to bend without breaking; even in PETG or ABS, the spring will break very quickly under sideways forces. The button is designed to never expose the spring to such forces, so it should work just fine once assembled. You may need a brim for this part (in that case, cutting it off with scissors is the best way to get the brim off without damaging the spring). You can find a customizable version of this spring here. Assembly instructions: First, check if the button fits into the cover (with the pins away from the button); if the cover is too tight, first make sure you don't have bits of the first layer sticking out in the round part. If that doesn't solve the problem, there are two small notches inside the cover to stop the button from wobbling; you can file them a bit until the button can travel freely. The cover pins fit into the holes in the panel and should be a tight fit, requiring some force to assemble. If it's too tight, you can file the holes a bit; if it's too loose, a drop of glue on each pin will hold it in place. Next, the pin goes into the hole in the base (the bigger flat part inside), with the two holes on top pointing sideways. Now, the spring goes into the cover around the pin. Finally, the button should pressure-fit into the pin. If you're using the box, place your electronics into it and close it with the panel. This model was surprisingly tricky to get just right; I hope someone finds a good use for it. If you do, please upload a make.