Small reusable rounded bottom planter mold

thingiverse

I wanted a small, simple shaped concrete planter and I was inspired by some great planter mold designs, such as [this one](https://www.thingiverse.com/thing:2918926) by esparapse and [this one](https://www.thingiverse.com/thing:4089572) by chappel. This was modeled from scratch and prints without supports. I've reused the same mold multiple times without problems using a concrete patching mix. The finished product is about 3" wide by 3.25" tall (~75x80mm). <b>What you need</b> -The 3d printed parts; 1 inside, 2 bottoms, 2 sides. -Some tape, I used electrical because it has some flex -A balloon -Your concrete mix. I used a concrete for patching so the aggregate was small. I'm sure a plaster would work as well. I would suggest avoiding typical concrete with large chunks of aggregate. <b>How to</b> -Stretch the balloon over the inside plug and work any air bubbles out. -Assemble the 3d printed parts and tightly wrap with tape -Mix your concrete according to the manufacturer. Be sure to use all suggested safety equipment. -Add the concrete to the mold and tap the mold on a scrap work surface to vibrate bubbles loose. -Wait for it to cure according to the manufacturer. I waited about 24 hours. -Very carefully remove the mold - it will still be very brittle at this point. Cut away the balloon and the plug should slide out. If it feels stuck you can apply a little bit of force using the square hole on the inside plug. -Wait for it to fully cure for a few more days and sand to the desired finish. -Apply any cement sealer or paints you would like.