I recently build my new PC for some 3D work I do, as my old Predator laptop was not keeping up.

I have an automotive background, Lian Li graciously shares the CAD files and I have a Creality Raptor 3D scanner, so the 3D mods were inevitable.

Mods: 

\- Back plate  
\- PSU exhaust duct  
\- Wires cover  
\- CPU cooler + GPU Duct/Air directioner (Front and side)  
\- Open front cover for better PSU cooling (I'm redoing this, the first print was done in 45 degrees angle and warped a bit in the end.)  
\- I'm still working on the CPU cooler exhaust design, as the first didn't look right

I didn't fully close the rear portion of the ducts, as some air is still needed for the other components. The backplate is bolted to the case and the other parts are fixed using 6mm diameter magnets.

I have done some stress tests before the mods, but didn't do after yet. I'll wait until I get the new CPU exhaust part. Honestly I don't think this will make much difference in cooling, but I enjoyed fiddling with this.

Full build spec (I'm in Brazil, so keep in mind some simpler choices):

\- Asus TUF B860m Plus Wifi  
\- Intel Core Ultra 5 245KF  
\- 2x 16GB Corsair Vengeance 6000MTs CL36  
\- Samsung 990 Pro 1TB SSD  
\- MSI Geforce RTX 5070 Shadow 2X  
\- Mach 1 Empower 850W PSU  
\- Thermalright Peerless Assassin 140 SE ARBG   
\- TR TL-C12 Pro - rear fan  
\- 3x TR TL-E12B V3 - bottom fans  
\- 3x TR S12 ARGB - top fans

Another Lian Li A3 build - 3D mods (work in progress)