Hi,
I’m newbie to this world, so please bear with me
I’m building CoreXY, how do I fit it for 2 print heads?
Thanks

More details on your setup would allow for better help
It doesn't matter what gantry system you are using, there are many ways to fit them, the best one is debatable and highly depends on how you've built it/plan to build it.

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"keep in mind, even the best printer can not print with the best filament if the user is the problem." -Ohmarinus