3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: or !functionalprint@fedia.io
There are CAD communities available at: !cad@lemmy.world or !freecad@lemmy.ml
Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia. Code of Conduct.
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Be respectful, especially when disagreeing. Everyone should feel welcome here.
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No porn (NSFW prints are acceptable but must be marked NSFW)
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Do not create links to reddit
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If you need an easy way to host pictures, https://catbox.moe/ may be an option. Be ethical about what you post and donate if you are able or use this a lot. It is just an individual hosting content, not a company. The image embedding syntax for Lemmy is 
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I have my doubt's that resin would distribute evenly throughout all the sand in the model. I also have some doubt's about the sand, maybe you can shake/vibrate the model so the sand distributes well, but it will probably be hard to get into all the small smaces depending on model shape and how dry the sand is.
Why not just straight resin as filler?
I thought of that a well. The resin will likely not get everywhere. The idea was saving costs as resin is kinda expensive.
Sand by itself doesn't add much to rigidity I think, it only adds weight. With only 3 walls and sand you'd probably be lacking in rigidity in the areas without resin.