Prusa Enclosure Fire Suppressor bracket (FSS 100)

Hey team,

I've put together a little bracket to hold the Italian Made ‘Fire Safety Stick’. This bracket is made to suit the Prusa Enclosure and can attach to any of the 4 mm holes on the exterior. The bracket itself can swivel to any orientation or position around the enclosure depending on what's most convenient for your setup. In addition, I have incorporated four 10mm x 2mm disc Neodymium magnet pockets into the G-code, with pause breaks, so that you can not only attach this bracket using nuts and bolts to the enclosure, but to anything ferrous material such as a bar fridge, steel table leg etc. You can also choose to use the magnets to position the brackets to whatever position on the Prusa enclosure looks best to you. In order to have enough purchase on the extinguisher, please print two brackets :-)

Personally I'll be making two sets, one for my Prusa enclosure, and a second for my work truck where I'll use the magnets to affix the extinguisher to the inside of the cab in case there are any mishaps at work, or need to assist with an accident on the road.

With regards to magnets, I would highly recommend buying them from a reputable distributor in your country to ensure they are of high quality. N52 Neodymium magnets with a Gauss rating of 2748 or higher would be best to achieve a strong hold on steel. Helpful tip, if the seller doesn't have a data specification sheet for the magnet, chances are you're buying an inferior / low quality product, avoid the seller. Get yourself something of high quality, doesn't cost much more and you'll have a much better experience :-). For context, the extinguisher (FSS 100 model), weighs 352 grams but is heavy one one side.

So now to the extinguisher itself; I'm not affiliated in any way to this company, however doing a little bit of research, this extinguisher seems just about perfect in the home lab or garage as it;

1. Doesn't make a mess with powder
2. Safe to use indoors and non-toxic (need to open windows once fire is extinguished)
3. Compatible with electrical fires (which is what we're after)
4. Very light weight and overall small form factor (much better than a steel bottle)
5. Requires no maintenance (15 years shelf life)
6. Easy for just about every person across the world to get their hands on one as they distribute this product worldwide

In Europe, UK and Ireland it's marketed under the name ‘Fire Safety Stick', in Australia ’Fire Stryker' (where I live), and the USA ‘Element’.

Speaking from personal experience, I once set a car on fire whilst doing some welding and used a conventional powder extinguisher, what a mistake, the mess was unbelievable. It saved the day, but I wish I used a different extinguisher. If I had my time again, something like this gas extinguisher would have been a much better idea.

Now onto the model; I decided to print in Flex TPU, mainly so that it has a bit of flexibility to wrap around the extinguisher, and so that I could make it slightly undersized to hold on tight. I didn't want any rattles or wobbles during printing.

I made use of Prusa Slicer to modify the infill surrounding the central bolt hole so that you can apply a bit more torque on the nut without it stripping through the plastic (100% infill), and kept the rest of the model at 40% infill to have good flexibility. I used the Gyroid infill pattern and simple a simple Monotonic pattern for the top and bottom fill pattern.

The overall design is in keeping with the case, chamfered edges and 30mm wide to suit the exterior rib diameter of the Prusa enclosure. The nut and bolt pattern uses a similar design to other Prusa enclosure parts. This time I made the nut retainer slightly oversize at 5.6 mm rather than 5.4 mm so that it was a little easier to get the nut seated in the right position, but still hold the nut in place. The nut and bolt are supplied with the Prusa enclosure as a spare parts and their respective part numbers are M3n (nut) M3x12 (bolt).

Enjoy and stay safe out there ;-)