The project comes pre-oriented on the build plate. No supports are required when printing the pieces.
The hygrometer/thermometer just clicks in place.
If you want an accurate reading do not fill with silica the central one with the sensor.
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It's available a variant of this model that use a different hygrometer sensor.
You can find it here:
BambuLab AMS Silica Gel Box With Mi/Xiaomi Hygrometer - Full Set
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N.B. Do not remove the Object Modifiers from the plate 03