- I'm not too familiar with dual extrusion, but I do know that the Repetier-Host software allows you to set each stl file to a specific extruder. I model the support manually for a majority of my models, so this wouldn't be too different from my normal routine. I do my work in PTC Creo and model each part in reference to each other within an assembly. This allows me to dimension support gaps with offset values and design the support more effectively for removal.