split - merge more then 3 Parts same Material

[turnfin 0]

Hello,

sorry for my english.

how I can solve this Problem ?

I have a U1 with Dual Printhead,

I want to dual merge more Parts then 4 ,

I have 3 different Colors of Parts (I only want to have 2 Colors) then Error.

i can split into Parts,

but cant merge more Parts in a first or second Colors/Material

3D window error

An error has occurred during the 3D view drawing.

IndexError:´list index out of range´

@ sceneView.py:_renderObject:1336

@ sceneView.py:OnPaint:1177

@ sceneView.py_OnGuiPaint:228

hopefully you can help me

thank you.