This adapter allows you to add a 41mm OD humidity sensor to the front of the F-BOX by the filament exit without having it take up a desiccant slot.
It's a tight fit, just push down.
I used these sensors:
https://www.amazon.com/dp/B07GR67G1M?ref=ppx_yo2ov_dt_b_product_details&th=1
Printed in PETG 0.6, 2 perimeters, 10% infill.
The author marked this model as their own original creation.