This sign is intended to be lit up to warn others not to disturb you when you're recording. (We chose "On Air" as it's a lot less letters than "Recording" and has a similar meaning.)
We haven't figured out the electronics yet. Planning to use something like a WS2812b LED with a wifi microcontroller. "Hey Cortana, I'm recording now!" (or something like that).
There are 2 and 3 sided wall-mountable versions and a 2 sided desk mount version. Each has variants with and without integral letters, so you can either print letters in another color or paint them. The 3 sided version also comes in a 2-part one with a removable top to avoid the support marks showing through the translucent filament.
Included is a wall mount intended for the wall signs to hang from.
Full disclosure: Gearbest gave me the CR-10 that I printed this with, so I feel sort of obligated to put it through it's paces.
If you like my things, I don't mind Tips, but checking out our Lego R2-D2 YouTube page also helps!
Obviously print the sign in translucent filament. We used ABS. You can scale the whole thing up or down some if desired.
Printing the letters in something like black and gluing them on later is probably better than painting, but there's a 1-piece version if you want to paint it.
The 3 sided version also comes in a two-part varient. That's good because then you can print the parts and avoid the lines left by the supports.
No support is needed, except for the single section 3 sided version. I used 5% for that.
The letters probably don't need infill either, but I'd use 10% or so for the wall mount.
Simplify 3D's gap fill did a great job with the thin walls, 3 upper and lower layers and 2 shells. It printed the outer and inner shell and it's gap fill make a thicker bead in the middle for a solid wall. Other software or printers may need to play with tweaking the settings some so that you get a single solid wall instead of 2 detached shells.
If you choose to print the one-piece version with the painted letters, then you'll probably need to make sure to use paint. Markers don't work on filament because they wick into the gaps and a terrible smudge oozes out from the letters.
I knew that and still tried a marker with horrid results. (fortunately some alcohol cleaned it off).
Be careful with the letter orientation. In particular, the "O" isn't symmetrical. So make sure they look right before gluing.
Obviously the glue/solvent depends on the material you print with. We printed in ABS, so used MEK (not recommended because it's nasty).
Note that the solvent makes it easy to smear the black letters onto the translucent sign, so be careful not to smudge them.
Gluing the Two-Part Top
If you print the two-part 3 sided sign, use care gluing the top on. Any solvent that glues the parts together is also likely to smudge or streak the clear parts if it drips down the sides.
We had luck putting a thin layer of solvent along the top edge and then pressing the top onto that. A bit didn't get sealed though, so we had to try some more and caused a dreaded drip.
One part is a wall (or desk?) mount to secure the sign. It's intended to be affixed to the wall with two screws, and then the sign hangs from that. Since it depends a bit on gravity, it probably won't be great on a desk (I'm working on that.)
I used Sketchup
The file's included. I build the base for the sign, then stamped out some letters. The biggest trick was making the recessed hole for the letters. It has to be a little bigger than the letters, so that was a bit of painful hand-editing to make the recessed bits 0.5mm bigger on all sides.
In the future I think I'll try the Fredo6 Round Corner extension. I think that by "embossing" the letters on the flat surface, then I can "round" the corners of that surface (like with only 1 side to round it), and then chop off the rest of it. Then extrude the resulting letter, which should be slightly bigger than the original.