Step 1

Print the mold and evenly apply vegetable oil to the inner wall for lubrication.

Step 2

Fill the mold with "DIY Knetbeton"
Optional: Pre-implant several metal wires to enhance the structural strength.
Let the molded parts rest in the mold to "dry" for at least 24 hours

Step 3

Be careful when disassembling the outer shell, but make sure to keep the "stamp base". Do not try to forcibly remove the base from the concrete product, otherwise it is very easy to damage the surface texture.
You might as well use a heat gun to heat and melt it, or simply put the part in the next barbecue or campfire to bake it, so that the residual mold material can be completely burned off—this is both environmentally friendly and ingenious!

The outer support arms need special attention
Some small fragments may inevitably fall off, but this just adds a touch of simplicity and antiquity to the whole work, showing more traces of time and historical charm...