UniFi Cloud Key G2+ runs quite hot especially with large hard drive inside ~ 51 C.
I've created a mount case with 120 mm cooling fan. Now the temperature is about 37 - 38 C which is optimal.
No supports 0.2 mm layers PETG or PLA is fine.
UniFi Cloud Key G2+
https://store.ui.com/products/unifi-cloudkey-gen2-plus
Noctua 120 mm fan:
https://www.amazon.com/gp/product/B000YSONMO/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
The author hasn't provided the model origin yet.