Hello!
Hmm I certain don’t even know if it’s possible but silver would be nice 
I’m a designer so creating jewelry made out of sliver would honestly be amazing!!
If not then it would be awesome to find some material that you can put over a plaque of silver or any other material that’s not installed in the GF that would be automatically read by the GF …
I’m pretty sure you need a fiber laser to mark silver.
You will certainly not be able to cut or engrave silver with a 40w C02 laser.
This thread on SMC asks about marking sterling with cermark, and they seem to say No.
Maybe you can etch designs into silver using a glowforge-cut masking material and a chemical etching product, as discussed on another thread here on our forum.
Thanks !! 
How about vegan leather (http://inhabitat.com/muskin-is-a-100-biodegradable-vegan-leather-made-from-mushroom-caps/) and different sizes and colors of acrylic discs?
Ditto for this list.
Thread for some discussion I started before posting in here: Color layered proof grade plywood
So I recently went out of lurking, and actually made myself a profile now that we’re approaching actual release! 
But I wanted to request a possibility for color layered plywood
In the original post you mentioned that there will likely be two toned acrylic that you can engrave into for another color, but i was curious about a similar idea of having different layers of dyed wood, or perhaps a gradient of colors. Then having a proofgrade setup that knows exactly how deep to engrave for a certain color, or shade
Not sure if this would bypass the issue of charring hiding the colors of the wood, but possibly using a dremel brush to take off the char would show the layered colors of the wood
Thanks for reading my thoughts, and hopefully it’s not too far fetched xD
I’d love teak. My daily thoughts beginning with, “I could do this on the GF,” are starting to include a lot of custom items for the boat. I’m sure there are plenty of other Puget Sound area boaters/future GF’ers who have similar thoughts.
I would like to see some multi-layer acrylic or Delrin.
It would have a white face layer, a colour layer and then a black layer. Depending on the depth of the engrave, it would show a different colour. I am not sure how feasible this is, but given that two colour works (per the into video), it should be possible.
There could be an additional white layer between the colour and the black layer, yielding the possibility of a colour gradient depending on the thickness of the colour layer.
So for me, 1/8" plywood with various wood types for the veneer surface - maple, walnut, mahogany, cherry, padauk, purple/yellow heart, plus some of the exotics if possible.
Also, sheets/rolls of blank paper used on the front/back of the proof grade materials.
I don’t think I ever replied to this, so…
Acrylics: All colors. Including glow-in-the-dark, silver, and gold. 1, 2, and 3 layers of colors.
Glowthinnies™: Many materials available in very thin slices. 1/16, 1/32, 1/64…
Thanks!
I’m not sure myself if I did, it has evolved.
Acrylics of all colors and thickness out to max that can be cut reliably.
Peel and stick felt. Several colors.
Translucent acrylics, esp in fluorescent colors – blue, yellow, green, red, orange.
image courtesy USP
i’d love to see a rainbow or graduated colour range plastic. though that would depend on how fine the depth control could be.
that or very thin sheets of that type of plastic in a wide array of colours so we can cut and fix to create the effect we want.
hmm. well i an international customer, so i don’t know how much Proofgrade i’ll be able to get, but here’s what i’ve already considered.
just about any flat construction material, but aside from the standard woods, fabrics, plastics and leathers, i’d like to see just a really wide range. glass, ceramic, tile, antistatic materials, foamcore, pinboard, fluted plastic board, laminates, blackboard, whiteboard, melamine?, translucent plastics, light diffuser panel or sheet, various reflectives, magnifying or focusing options, a wide variety of card and cardboard, gasket materials, diaphragm rubber, etc.
and that list doesn’t include some of the crazier things i’d love to play with.
i know that leather has been suggested, but that comes in varieties, and i’d like to see more than just the one type. hush, firm, different finishes and tanning types. hard leathers and various types of stiffener card. the problem with the leather is you’d do better to attach the QR code as a pinned card than as a sticker, which would ruin many leather finishes, and you can use both sides so putting it on the back isn’t optimal.
i know that lasers do well cutting insulators, but i wonder about materials like Viton or other high temp plastics or rubbers.
From attendees at Maker Faire interested in the Glowforge, the clear laserable polymer stamp material would be good.
Mylar sheets for stencils
I was cutting a stencil earlier today on my Silhouette Curio and thinking how much more detail I could get with a laser.
️ 1/8 inch ply
️ 1/4 inch ply
️ Leather
️ Canvas
️ Any acrylic
PCB etching via laser is very interesting. So far it seems a bit experimental (e.g. http://makezine.com/2007/01/22/how-to-use-a-laser-to-etc/) but if a PCB prepared for laser etching and cutting could be sold as “proofgrade” that would be awesome for DIY and small volume electronics makers, prototypes, etc.
Hmm, A proofgrade PCB where it is already coated with a material. Laser off an inverted image and etch away the excess copper. That would be pretty cool.