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A quick search of the grand ol' internet shows that most people are recommending a wood fiber filler to be added to traditional casting material such as epoxy or polyester resin. There is a PDF availa …

Yes. I have both devices and agree that the cost is much less for the spooled filament than the manufacturer's provided small quantities. Both devices use ABS and PLA. The 3D pen I have used 3.00 (2.8 …

When dealing with a concrete surface, the first consideration is the smoothness of the surface. If that is acceptable, and of reasonably decent flatness, your options expand nicely. If it's a coarse s …

Kite string is a product. It is designed to be strong and light to enable kites to fly under optimum conditions. For ordinary kites, ordinary kite string is sufficient. High performance kites (large l …

One can find HDPE (or maybe it's LDPE) cutting boards in various sizes and thicknesses. One can also purchase sheet polyethylene in various thicknesses. Using this material in a manner similar to wood …

Balsa wood is available from many sources and can often be found at local outlets. Various thickness panels are usually presented in shelf units or organizer caddies, typically in 24" or 36" lengths ( …

Balsa wood is likely to provide the best strength versus weight ratio of any building material you'll find. Peter Sripol recently posted a YouTube video of his construction, a rigid airship. Pipe clea …

Gummy bears! Stronger than gelatin, yet "flexible" to handle the other requirements. Various colors for those willing to sort an entire bag. One heats the gummy bears in a double boiler to avoid bu …

Concrete is a hard substance created from the chemical reactions of the various components mixed during the build, including water. Once cured, smashing the material into any level of coarseness or fi …

Despite the questions in my comment, one answer to your question may be to use 3M Command Adhesive products. These are double sided foam strips with an accessory attached to one side. Sometimes the ac …

Operating with a two stage fill is a good start. Consider also that the dead space at the bottom need not be anything special, generally speaking. Cut cardboard, stuffed newspaper, just about anything …

Your question brings to mind a concept of water soluble paper. The Google tells me there is such a product, at least one or two, perhaps more. The web sites indicate that it's often used to make easi …

For your objective, spill-resistant and ding resistant, you're dealing with two parameters that could be combined. As noted in Bill Horvath's answer, the weight will be a factor. Cardboard for concret …

This particular shape "screams" 3D printed. There are a number of programs which would allow one to create the model to be printed. I'm particularly fond of OpenSCAD, a descriptive language type of 3D …

PVA glue is available in white, yellow and clear varieties. I've had the white and yellow stuff set up (cure) in bottles and remain liquid appearance, but have not used the clear stuff to know what ha …