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frag plugs and discs are relatively inexpensive items. unless you were going to make them a certain shape or size with an intended purpose in mind, not sure that even if you did find an appropriate material the would hold the shape without being to fragile, that it would be cost effective. just my 2 cents
Pete, zippy number numbers, made some and they're on his build thread. He made them out of dish clay and then fired them up. I got to see them in person and they were awesome.
I kicked around the though of making my own out of ceramic since I also have a kiln. There are a bunch of posts that specifically tell you how to make the molds to do this. After some thought, and considering the cost of electricity to fire up the kiln, i nixed the idea.
I also kicked around making my own from tile....this is probably the cheapest. You can actually purchase inexpensive one inch tiles from HD. I happened to have two cases of tiles left over from a job and cut my own (which are mentioned HERE).
I eventually just went back to buying them....I think something like 25 for five or six bucks.
You can get the ceramic disks on ebay from alternative reef products. Or if you are arts and crafts make em from dis ware clay. But you need a kiln and proper firing temp.
Always hated the look of the round or sqaure frag plugs on the market. I used to make dyi frag plugs years ago. Using all kinds of differnt things. Including crushed coral\sand and sack create Or the Epoxy used put the clear shine on a Bar top forget the name or WaterPlug cement. My brother in law and nephews do it as a project they use solo cups and call them coral cookies.