A small dryer that takes a 140mm pc fan. I use the Noctua ippc 3000pwm. You can use whatever fan, but make sure it has a high amount of static preasure, and airflow. Noctua fans are well known for both. Look up some good numbers. I also use a 12v Controller that brings out the full performance of the fan. You can use a wood burner, or hot glue gun to fuse parts. Normal M5 screws/case screws will attach the fan to the bracket. The fans come with four screws.(you only need 4 unless you want to print a grill for the fan, which is recommended) comment or message me if anything is wrong. I will fix it within a day or two.

Fan: https://www.amazon.com/gp/product/B00KFCRF1A/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

12v controller: https://www.amazon.com/gp/product/B0BBSBV9CF/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Creality

Ender 3 Pro

Yes

Any above 65-70