This is a quick relay mount for these 5v relays. I used it in my automated enclosure video found here. I suggest printing it from PETG and I use M2.5 x 6mm screws. M3 cap head screws, the head was too big near the blue terminal.

Link to the relay on amazon for reference. 

https://www.amazon.com/gp/product/B00E0NTPP4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1