1/2 (half) Inch and 3/4 (three quarter) Inch Threaded Electrical Junction Box Plugs

Model Overview & Print Notes

Summary This is a threaded plug (cap) for electrical junction boxes. There are both 1/2-inch and 3/4-inch versions as well as versions that include a hex thumb screw for easy tightening/loosening (which I highly recommend--who wants to carry around a huge flat-head screwdriver just for plugs?). Note: I highly recommend using some dielectric grease on the threads to ensure water can't get into your electrical box. Remember: In order to comply with the National Electrical Code (NEC) you'll have to print this in a flame-retardant filament and protect it from UV rays somehow (either by using UV-stable filament or painting with a UV-protective coating). Print Settings Printer Brand: Prusa <p class="detail-setting printer"><strong>Printer: </strong> <div><p>i3 MK2 MMU</p></div></p> <p class="detail-setting rafts"><strong>Rafts: </strong> <div><p>No</p></div></p> <p class="detail-setting supports"><strong>Supports: </strong> <div><p>No</p></div></p> <p class="detail-setting resolution"><strong>Resolution: </strong> <div><p>0.2mm</p></div></p> <p class="detail-setting infill"><strong>Infill: </strong> <div><p>15%</p></div></p> <br> <p class="detail-setting notes"><strong>Notes: </strong> </p><div><p>Print flat (no rotation) with 3 perimeters and it should work out fine. The threads are slightly under-sized to make for an easy fit. If you find the plugs are still too tight just adjust the "diameter" value down a bit in the included .scad file (say, -0.005 or -0.01).</p></div> How I Designed This OpenSCAD FTW <div><p>I looked at a threaded plug I happened to have lying around and made something similar in OpenSCAD. It actually took me a few prototypes to get it right because mass-manufactured plugs have under-sized threads in order to be easier to fit/tighten. I guess the electrical nerds over at NEC/UL expect everyone to <em>always</em> use dielectric grease on these things!</p></div>