https://www.instructables.com/id/3D-PRINTED-CONCRETE-MOLD/

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MOLD FOR CONCRETE PLANTER

PRINT IN PLA OR ABS FILAMENT

Tools

1. Container to mix mortar

2. Trowel or mixing stick: mix concrete

3. Dowel or other flat-edge to screed excess mortar

4. Air purifying mask: at least an N95 as silica exposure can damage lung tissue)

5. Disposable gloves: to apply vegetable shorting (release agent) on the inside of the mold

Materials

1. Mortar: DO NOT buy the bags that say "concrete" as they have some pretty big coarse aggregate that would be troublesome on some edges of the mold. Can be obtained from your local home improvement store

2. Potable water: if you can drink it is good for mortar

3. Vegetable shorting: this is our release agent. It is the cheapest thing that works like any other petroleum/jelly release agents

4. Dyes or colorings (OPTIONAL): I find that if you do not use dyes or colorings + sealer, the finish is somewhat bland (ashy gray)

5. Aerosol sealer (OPTIONAL): again, this is optional but it will give your product a nice finish that will last forever

Procedure

1. So basically, just download both STL files (mold A is the shell and mold B is the cavity part)

2. just follow the instructions on the packaging the mortar came in OR, you can use this rule of thumb that always works: 1 part water for every 5 parts of mortar. Print as many molds as you want and calculate the amount of water + mortar

3. Mix: at this point add any dyes if you have any

4. Apply "release agent" on mold

5. Fill mold with mortar, slightly overfilling it, and screed with a dowel or other flat-edge device

6. Wait 24 hours to cast mold

7. At this point, apply any coloring to the planter. If you have colorings, follow manufactures recommended instructions

8. Apply a few passes of sealer (you can use the sealers that come in a can but I find that those are troublesome and messy since they require a brush of somesorts)