Mangalore Grenade Knob

thingiverse

For all those who've downloaded my Mangalore Grenade with no likelihood of ever actually making it, now you can make it more completely with the little vernier knob that goes on the end. I've read that this now-obsolete knob was also used on Zorg's ZF-1 somewhere, so there's another bunch of Fifth Element fans who can make use of it too. You will doubtless notice I haven't put the numbers on the dial. I think that level of detail is still beyond most filament printers, so I've chosen not to bother. Eventually I'll work out some artwork for 2D printing it on paper, then maybe a 3d version for sla printing. Eventually. Or you could try finding some tiny rub-down lettering if they still have it in your part of the world. (Anyone old enough to remember Letraset? That was great stuff.) Print Settings Printer Brand MakerBot Printer MakerBot Replicator 2 Rafts Yes Supports Yes Resolution fine: 0.1mm Infill 20% Notes Examples illustrated were printed in PLA Post-Printing The knob lever is glued to the knob bottom as shown, and the knob dial is snapped up into the knob base so that it's free to turn. Then dial and base are pressed down over the bottom piece, capturing the dial. Eagle-eyed makers will notice there are two versions of the files for the 'knob base' and 'knob bottom'. The first four files are all you need to make the knob, but I found quite a bit of careful filing/sanding was needed to get them to fit together properly. The dimensions are accurate, but my old Makerbot doesn't make allowance for filament thickness. The alternate files 'knob base 2' and 'knob bottom reduced' are tweaked slightly - a little larger and smaller respectively - to fit together more easily. Assembly to grenade; More photos to follow (soonish). To attach the knob to the top of your grenade you will need a short 6mm or 1/4 inch screw/bolt and a 2mm grub-screw. Just like on the original RS components knob, the grub-screw screws into the little hole in the side of the 'knob dial'. Then you poke the bolt up inside the grenade and out through the hole in the top, where you see the alignment features for the knob bottom that now suddenly make sense. Slide the knob assembly onto the bolt until it seats properly on top of the grenade and tighten the grub-screw.