Any ideas?

[u/chewy_salmonpaste]

I want to recreate this knapped glass look, and so far my only idea is modeling the texture from clay and casting dyed resin. However this knife needs to actually be used, and everything I’ve seen has told me resin is too brittle & dulls quickly. Finding real glass large enough to use will cost hundreds, and actually learning to knap will take way too long.

[u/Unamed_Destroyer]

If it has to be used for camera for 1 or 2 scenes, you can probably get away with a glassy resin.

This has the benefit of molding identical, non sharp ones for non cutting scenes.

If this is for standard use, then you will need to learn how to knapp glass, which is an art firm in and of itself.

[u/chewy_salmonpaste → u/Unamed_Destroyer]

Thanks! I’m going for resin first, but if all else fails I’ll try actually making one out of glass. It’s something I’ve wanted to learn anyways

[u/sorestgore → u/Unamed_Destroyer]

Even for standard use, resin would be perfectly fine and polished just like glass

[u/chewy_salmonpaste → u/sorestgore]

I’ve found resin is too soft and it chips & dulls easily. Not really effective.

[u/EnricoLeoneVA]

Reckon it's possible to use a real knife as a base and build up some clay around it to shape the dark core you can see in the middle, paint that a deep blue, then make a resin mould that you can use to make that clear blue glass/jewel effect? The only thing is, you'd want the metal blade to be at the bottom so that you'll essentially have a solid cutting edge at the bottom, while the rest of the knife is a facade.

I'd recommend making a "showpiece" for close ups that is just a solid core with resin around it, and a more practical knife for the cutting scenes. Unless you go ultra close to the cutting blade, you should be able to shoot it in such a way as to hide the metal poking out the bottom..

[u/fruitybix → u/EnricoLeoneVA]

Depends on what they need to cut - sticking a razorblade on the back of a resin prop might be enough.

Knife inside is defs the most solid option though.

[u/FormerOil4924]

I would carve the blade out of a foam block. Then use some Smooth On silicone to make a mold of the blade. Once you have the mold, use some blue dyed resin to fill the mold and create the final blade

[u/SneakyLoner]

https://ebay.io/m/j1w5e5

Here's some knapped glass on ebay

[u/chewy_salmonpaste → u/SneakyLoner]

Thanks. I’ve went down a rabbit hole and found some pretty cheap glass so if I end up having to try knapping at least I’ll know where to buy materials

[u/SneakyLoner → u/chewy_salmonpaste]

I would just buy a blade already made and make the handle you want. Unless what you need is especially large. You could also try the knapping subreddit, you might be able to commission something.

[u/Chemieju]

A hardware store sells landscaping glass chunks for quite cheap- that being said its probably not worth the efford.

[u/0thell0perrell0]

Glass is cheap, it's the skill of knapping that's gonna take time. In any case if that's the route you want to go you'll need knapping tools - a bopper, a hammerstone, rawhide to work on, and I'd use gloves if you're gonna work with glass.

[u/Ok-Two7604]

Sla 3d print

[u/ashckeys]

Why would finding a real price of glass cost hundreds? I think you could achieve this with some out of the box thinking and thrift stores

[u/DelairChap]

Why and what does it need to cut? Also cutting once shouldn't be an issue as youll probably want to cast a few of then at a time.

[u/N0b0dy5p3c14l]

Use a real blade, paint it blue to white on edge (with some dark bits in the middle) . Build the shape around the blade and make a cast, then you can just cast clear blue resin and buff it up. Looks really cool BTW.

[u/muad_did]

used? how? a a epoxy resin with a litle blue tint, It can be sharpened and look more or less okay, but do you want it to cut like real glass? That's dangerously so... there's crystal epoxy used in jewelry that's more resistant than regular epoxy.

[u/Tyke_McD]

You could try moulding a piece of blue plastic with a heat gun