A lot. The weight of the frame plus about 10lbs or 5 rolls of the PETG filament. But then there is the bed. OMG is that bed heavy. It is the tronXY 500x500 2 pc aluminum heatbed but I have added the 450x450 silicone mains powered heater, a sheet of cork, and that 4mm thick 510x510 Creality Ultrabase. But that is good. I don't want weight on the gantry but on the frame is good and even on the bed is ok. It will help keep things from rocking around from the inertia created by the moving X and Y. Or so I hope. And I will keep that extruder and carriage as light as possible.

I am really happy with the dual Z auto align and G34 command on the IDEX. So much so that I am really thinking about getting 2 more lead screws and steppers and running 4 motors for Z. The Octopus has 8 driver sockets. I can use 4 for z 2 for x and y 1 for e and still have an open socket for future expansion.