@dc42 Hi, I'm the designer of the Orbiter extruder.
For delta printers you need the version with flipped gears like this one:
https://www.thingiverse.com/thing:4609940
The filament path is closer to the middle of the extruder so has a better clearance towards the rods.
I designed an adapter to fit this version you can find it here:
https://www.thingiverse.com/thing:4648938
The result is not the best but it works.
The upcoming V2 will be more optimized in size and would fit better to delta printers. But I have not tried it yet.