Summary

The spider scare box in
https://www.thingiverse.com/thing:2759750
made me decide to make a much smaller one for a 20% scale spider from
https://www.thingiverse.com/thing:179544
The spider is drawn out of his hiding place by a small piece of yarn fixed to the lid.
Slip the yarn through the hole of the lid and close the lid. Determine the best length of the yarn by sliding the lid open while your finger fixes the yarn. If the spider comes nicely on top of the lid and goes back when you close the lid, you can fix the yarn with a drop of glue.
https://youtu.be/ZQfBCR86m3g