A while back I bought an HP Elitedesk 800 G3 mini to serve as my primary home server. A little bit later I decided to try to put a 2.5Gbe network card in, so I ordered one (aliexpress or Amazon keywords: a+e key m.2 2.5gbe RTL8125B) and installed it in place of the wifi card.
The only problem is that the RJ45 connector was just floating around inside the computer and would, very occasionally, spark against the metal of the case. Not good.
This bracket replaces whatever FlexIO card you have in your HP Prodesk or Elitedesk G3 or G4 desktop mini or SFF machine. Note that it will not fit a G5 or later as they switched to a different Flex IO version, but you can get a FlexIO Intel 2.5Gbe card for those so you don't need this.
No it doesn't fill up the entire hole in the back. This is the back of a computer, think of it as extra ventilation.
If you want to use it for a different purpose you should be able to fill the two “front” holes in your slicer and add new ones.
The STL is intentionally upside down. Print with 100% infill. Use whatever filament you have on hand, this isn't a heat sensitive area. I used Sunlu PLA+ just because that's what was loaded.
Uses the hardware from the original Flex IO card to mount to the motherboard. The screws from the metal bracket that comes attached to the RJ45 board screw directly into the bracket.
Additional required hardware: two M3 washers, one on each RJ45 board screw.
The author marked this model as their own original creation.