which filament for printing a positive mold?

Good day everybody

my target is to laminate a glassfiber sandwich model airplane wing. To achieve that, I want to 3d-print a positive mold and then laminate the negative mold.

Which filament is recommended? It should be:
sturdy
little or no warping
able to sand
epoxy resin should stick to it/or filler for a smooth surface

thanks for your help,
Chris

pla
Fits all the criteria

saw something about Ultem 1010 being a really good one. cost effective and is strong..hope this helps :-)

https://www.youtube.com/watch?v=HQa6roPmS1M

You say it should be sturdy. Sturdy is a relative term. How "sturdy"? You also didn't say if you plan on reusing this mold. The molds that I make I use ABS.