As people still download this I have to ask: why? ^^
There's quite a few things I don't like about these older modules so I wonder why people prefer this to the newer ones. Is it because of the simplicity by putting a sheet of paper in and not having to print different materials? Let me know, if I know what it is I might consider a rework of this.
If you're looking for a complete and working clock you might give this thing a go:
There's also a version with 2 leds per segment as here but only one strip instead of two: https://www.thingiverse.com/thing:3095715
I strongly suggest using these.
I always liked 7 segment displays. So with absolutely no need to I decided to build one. The single frame was intended to be used inside a picture frame. But then I started playing around with the dual design and ended up building a clock that'll be collecting dust soon.
Sample code is provided for the single frame only using 15 leds (ws2812b, 60 leds/m).
However, the additional parts (although not pretty) might be of use. The case barely fits an Arduino Pro Mini and a rtc module I had lying around. Be aware of wire gauges depending on how you wire more than one of the dual displays. And if using the stand you might need to mirror it using your slicer, depending on the desired position. For the clock I used 2 (one as it is, one mirrored along y).
Hole spacing of the single 7 segment display is: 59,979mm / 110,004mm
Had a closer look and noticed one of the segments was off by almost 2mm
compared to the other ones. This has been fixed and the files have been reuploaded (single frame, dual frame, dual cover). Didn't even notice this myself while building it....
The connector has holes for horizontal/vertical mounting - what you can see in the pictures was an earlier version of that part.
I've printed all of these parts at around 60-70mm/s with mostly 1 perimeter only except for the parts on the back (stand, case, connector). Walls are multiples of 0,6mm which is what I was using as extrusion width. I recommend using PETG or or something forgiving. Pushing the led strips in puts quite some force on the thin walls.
No supports needed. Before pushing in the led strip check for those nasty parts where two of them got solded together at the factory. You don't want to bend the strip there.
Mounting the front plate is done using M3x6 screws. Any longer would make the screw holes break apart from the front bezel. Anywhere else I've been using anything between 6mm and 12mm what was lying around.
As can be seen in the pictures I started wiring the left one (when looking on it from the back) first. Signal is going in (green wire) then going through all 7 segments and returns using the purple wire.
The sample code will only work with one single led stripe using 60 leds/m and the frame printed at 100% size.
From there on it's up to you how you do the wiring. Using one data line per strip or per dual display. Oh, sample is for WS2812B leds using an Arduino Pro mini and FastLED.