3-Part Mold for a Cement Coaster
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A reusable hexagon coaster mold for cement. Great for leaving out on the patio table.
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Model information
- Source
- Printables
- Category
- Outdoor & Garden
- License
- Creative Commons — Public Domain
I wanted to try my hand at designing a reusable 3D printed mold for cement, and this is my first successful attempt. It is a 3-part mold that is held together with a rubber band. I've included the .step file in case anyone would like to customize it.
I chose to mix my cement with a little more water than recommended, to allow it to flow better into the rim, and it worked well. (it may lose a little strength, but it's a coaster, not a house foundation. I think it will be okay)
Remember to use some form of mold release or the mold won't let go of the cement. I used a very light, but very thorough coat of heavy grease (similar to what I use on my printer rails) and it seems to work well.
A quick how-to. There are plenty of more in-depth tutorials for concrete casting on YouTube if you need any further instructions.
Just grease the mold, mix the cement to a thick pancake batter consistency, fill the mold, tap for 15-30 seconds or so to remove air. Wait a minute, scrape off any excess from the top and let it cure overnight. I find that a little concrete may leak out from where the two walls meet, but usually only a very small amount.
As long as enough mold release was used, the coaster should pop out with a little persuasion. I've used the same mold 6 times now, and it hasn't shown any degradation.
I printed my mold out of PLA at .2mm layer height, 3 perimeters, 5 top, 4 bottom layers and 10% cubic infill.