Attached you will find a collection of brigadeiro stamps created in 3D. I highly recommend to use a small nozzle size if you are using FDM. In case you are going to produce with SLA technology, check carefully your resin properties before stamping food.
Specs:
Main diameter is approximately 20 mm. 0.2 mm nozzle is recommended (FDM). Print in a very slow velocity to achieve better results. Stamp depth is approximately 6 mm. Native file is attached in case you want to use the base and create your own stamps. No support required (FDM).
Note: Use food safe products in this case. Read more about it if you are not aware of this.