BOTW Remote Bomb

BOTW Remote Bomb
In: Cosplay, Legend of Zelda, Blender
Tools: Blender, FDM Printing

Early Designs

There was, at one point, a Mk1 of the Remote Bomb. There are also good reasons why there aren't any pictures of it.

Creating a perfectly smooth spherical object, that is 3D printable, is what is technically referred to in the business as a problem. There were also some design issues with making the decorative rings actually fit flush onto a curved surface. It took some trial and error to find a workflow that worked.

So after some trial and error, I moved on to the Mk2 (shown below). It looked good, it fitted together sturdily, and it lit up nice and bright. All things considered, it was a good result (and many happy customers would agree).

Design Improvements

However, I was never truly happy with it. In order to overcome the 'printing a sphere' problem, it was split into three sections, but this meant that there were some visible seams in the main body. The internal structure was also tricky to assemble, and not particularly sturdy (I’ve never had one break, but it wasn’t as over-engineered as I would usually create something). I also felt some of the details could be improved.

And so I began work on the Mk3, with the current design render shown in the title image of this page (and below). Better detailing for the midline circle art, stronger top and bottom cap pieces, and an internal structure that is... pointlessly strong, but why not.

3D render of the revised Mk3

And even better - no visible seams, while still being printable on an FDM printer. Result.

Creation - 3D Printing

The first version of this project was... mostly bits and pieces that didn’t actually fit together, or at least didn’t fit together well enough to meet my requirements for a “quality finished product”. However it did help me to iron out a large number of production and workflow issues I had back in the early days, so as an experience it was more than worthwhile.

The main central body, the base and the handle-cap, are all FDM printed using plant-based thermoplastics. These all went through several design changes in order to make them printable, as all of the shapes are somewhat awkward for FDM printing. The current design allows for the objects to be printed with smooth external perimeters, and a minimum amount of internal supports (as supports are essentially wasted plastic).

The circular external decorations are all created using UV-reactive resin, as that is the only way to create them to the level of quality and smoothness that I required.


The internal electronics are made using an embedded 18650 lithium-ion rechargeable battery, wired up to a recharge circuit with overcurrent and voltage protection. This is charged via a USB-C port, and powers a ribbon of SMD5050 LEDs winding up through a central diffusor core. All parts soldered with lead-free solder. I'm no professional electrician, but I haven't had a part fail yet, so I'm pretty please with how it all goes together!

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