A small mount or stand for a Xiaomi Bluetooth thermometer hygrometer.  This Xiaomi device is a very low cost (5-6 USD) temperature and humidity sensor with Bluetooth that can easily be integrated into Home Assistant as detailed by digiblurDIY and others on YouTube.  I use these Xiaomi sensors all over the house including in my 3D printer enclosure.  This mount makes the sensors more stable than just sitting them on a table and tilts them at an angle to make them easier to see.  I used PETG but PLA should also work fine.