I need a 3D design model

I need a 3D design model for my new slug trap which I have hand-drawn up.
I have attached here the sketch and details.
I will be using imaterialise to make the prototype so will need a .STL file with 0.01 mm tolerance for exporting the file.
this is a link of whats required from imaterialise
https://i.materialise.com/blog/en/5-mistakes-to-avoid-when-designing-a-3d-model-for-3d-printing
The functionaility of the design is relatively simple. but the external look of the design is detailed so think that it probably needs to be someone who has rhino or maya cad software
Please advise best price and lead time.