Don't Mind My BAD Painting
This casing was designed with the Spigen Steam Deck Casing in mind :
Amazon.ca : https://www.amazon.ca/gp/product/B0B75N73N9/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1
But with that said it might be compatible with other casing.
Light fiddling mostlikely required either way such as heating the bottom clip to better fit the casing.
The front cover is designed loose so you can ajust it with heat but does “clip” to the Deck with a case in most cases.
Revision has cutout for the top all the top ports files have been updated with the latest design.
Files are available on Cults3d to support my work or on Printables for free :
Cults 3D : https://cults3d.com/en/3d-model/gadget/steam-deck-brand-front-cover
Printables : https://www.printables.com/model/293304-steam-deck-front-protective-cover
The author hasn't provided the model origin yet.