Strange slicing result with dual extrusion

Vertex 3D Printer Vertex - Printer software (repetier, slicer, ...)
1

Hello all,

I’m a bit confused. I finally got my second extruder level with the first (it’s a second-hand printer and needed some work) and I was hoping to try a dual-extrusion print using Vertex Repetier.

I placed and combined the objects (just a humble Benchy, since that should be fairly foolproof, right?) just fine, but when I sliced using CuraEngine, my result looked like this:

1200×536 299 KB

Object placement on the left, slicing result on the right.

Can anyone suggest why this might be happening?

Thanks in advance!

2

Did you set Cura for 2 Extruders?

3

I did - it’s on the Vertex Dual Extruder setting. If you look closely you can see that the orange geometry (extruder 2) is inside a sort of outer shell from extruder 1. So it’s sliding for both extruders, it’s just generating additional geometry.

4

Are you talking about the wipe tower?

5

No, the wipe tower is expected. It’s cocooned everything in an extra single layer of filament from one extruder.