Anillo de enfoque para Logitech C270

thingiverse

The Logitech C-270 comes with a fixed focus, but this can be changed if we disassemble it and remove the drop of glue that holds the lens to the mounting rod. It's a simple process that allows us to turn the lens so we can focus from very close distances (almost 0 cm) to infinity. To make these parts, I used the design of the Notune 21 case (https://www.thingiverse.com/thing:714475/#remixes) and TheCrhisP's wheel (https://www.thingiverse.com/thing:1406879), which in turn comes from other previous designs. I made small modifications to both designs, most of them aesthetic, but the most important one is that I added a screw that blocks the wheel's rotation between two extremes. This was done to protect the internal thread of the lens because if we thread it all the way down, we can force it since it seems pretty fragile. Similarly, if we unthread it too much, it may come out. That blockage limits the focus range, but if we partially remove the blocking screw and continue turning the focus wheel, we will pass to the next or previous focus range, allowing us to achieve a closer or farther focus. I have it set up so that I can get, without touching the screw, focuses from very few centimeters (4 or 5) to almost infinity. To "choose" the focus range we are interested in, all we need to do is adjust the closest focus we need (usually the one that interests us most), remove the focus wheel and reposition it in the position where the screw blocks it on its "macro side". From there, we will have almost a full turn of the wheel for far focus. On the other hand, I added small marks between the teeth of the wheel so we can get an approximate idea of its position and therefore the focus distance. To assemble everything, we use the camera's own screws for the inner piece and then I used three 3mm metric screws. The external case was printed in two colors, using the "Pause at height" plugin to pause the printing when starting the third layer so that we can change the filament. Since I printed it with a resolution of 0.2 mm and put two layers of red filament, the stop must be made at 0.6 mm, that is, when the third layer starts. In the plugin, we also set X and Y coordinates so that during the pause, it won't be on top of the piece and we can purge the filament without problems. 3D view: https://youtu.be/EeMs4XBjf6s