Support is better on Discord. I am there everyday and there are other members who actively help.

@tinken When you say nearly identical, does that mean I can use MK3 profile without worry, on MH website it says Smoothie needs a different method of creating a profile, but there's no link or other references, on FB group somebody mentioned it is not straight forward and needs special settings?

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You can:

select the 2 objects align them on the axis you want to adjust select the right alignment select Options type in an offset to the amount you would like to move the part in by you can now click on the subtract object and select the internal part you want to remove

Needs to be 100% infill. Lines should work, but you need to flatten the layers. You can use less heat with a copper nozzle.