G-SHOCK Tough Solar Watch Stackable Window Charging Station

I admit that I'm addicted to G-SHOCK watches and have too many of them. And I've customized a few. Don't judge!

I am particular fan of the "squares" GW-B5600/5610 series (digitals) that are Bluetooth/Multiband-6 and Solar. I have a few GA-B2100s (analog dials) too. I don't need a "smart watch" but I like having the ability to set alarms and timezones via an app.

These Casio solar watches are great. They are rugged and reliable. The problem is that you can't just throw them in a drawer as they will loose charge in a few months. These will charge from sunlight or ambient room light, but if they are the Mulitband-6 variety, they also benefit from being near an outside window as they will time synch to the NIST from WWV/WWVH (or other international radio time signal). Depending on where you live, your watch time could automatically sync to atomic tome and be off by less than 10ms!

Update: This is not the ideal orientation for recieving NIST time updates. The internal antenna for time synch is horizontally polarized and the watch wants the 12-o-clock position horizontal, aimed whatever radio time source you're using (for me, that's Ft. Collins, CO). That said, my experience is that it still works with watches on their sides in a window. For reference, my window is facing the correct direction, aimed at my country's NIST transmitter. And it turns out that face down with 12-o-clock aimed at the NIST source will work, just not for charging.

My previous solution was to lay them in the window sill when not being worn (sample photo provided). This worked fine up to a point, but some of them have stiffer bands and it was getting hard to manage them (stacking/arranging) without them falling off or going face-down inadvertently (and not charging) if something bumped the shades/curtains.

So, I designed this stacking solution using AutoCAD to allow vertical placment and alignment. Printed on Creality-Hi using Creality Print. I'm running 2 stacks of them and they always face out and are manageable. I just unstack to the one I want and leave the empty on top for the evening when I take it off. I just close band to the 1st hole and slip over the top.

Filament:  Since these are in direct sunlight and will have some solar heat exposure in the window, I would reccomend PETG, ASA, PA-CF, or PC. I do most printing in PETG for cost so I used PETG+ Sunlu Midnight Black.

Settings: 0.4 nozzle, 0.16 layer height, 3 walls, 15% adaptive cubic infill, 5 top/bottom shells, iron all top layers, 5mm brim, textured PEI plate.