Frame for LED panel P3 64x64pix 192x192mm P3(2121)-32S-192x192-v8.1

Frame is divided to 5 parts:
- (blue dark and light) 2 corners (you need at last 2 + 2 of it)
- (pink and red) edge+side, for edge connecting every two panels, 
- (yellow) cross, for center connection (when you make more than one row of panels) 

You can make any shape and size from this puzzles ;) In .3mf are parts for 4x2 modules display (256x128 pix). If you want only 2x2 - you need only one center “cross” section. 

corners are two, and side+edge are two - because up-down and left-right holes in panel are not symmetrical.  

yellow cross have place (4 holes) for PCB HD-WF4 (hub75 controller, esp32 based, good because is cheap, and easy to configure and start displaying something in few minutes). This pcb is mounted 45deg rotated. 

Led panels are holded to frame by M4 countersunk screws. M4x6 - M4x8 should be ok. If you don't have countersunk screws - you can flip printed frame upside down, and use flat screws M4x10 instead.