Dual vertical PCIe card riser

I was looking for a dual PCIe vertical GPU mount that could accommodate a low-profile network card as well, but I couldn't find any that suited my needs, so I designed one!

BOM:
- x5 M3x10 Flat head screws
- x4 M3x16 Flat head screws
- x3 M3x6 Flat head screws
- x7 PCIe card screws (usually included in the pc case accessory box)
- x4 M3x7x0.8 washers
- x12 M3x4x5 threaded inserts
- x1 PCIe x16 4.0 riser cable, 15 cm, straight connector
- x1 PCIe x4 3.0/4.0 riser cable, 10 cm, 90° connector (be sure to print the right version)
- x1 Internal DB9 cable adapter (optional)
- x1 Gummy bear candy bag (optional, but strongly reccomended)

PCIe x4 riser: https://it.aliexpress.com/item/1005009187031178.html?cn=e-c&af=%7B%22c%22%3A%22JBKiI3YB9J8Zcc9P1725264347%22%7D&aff_fcid=aa45c10d84f243a4b76942fe871f7810-1762420578093-08945-_c3pa5aA3&aff_fsk=_c3pa5aA3&aff_platform=api-new-link-generate&sk=_c3pa5aA3&aff_trace_key=aa45c10d84f243a4b76942fe871f7810-1762420578093-08945-_c3pa5aA3&terminal_id=02e3c3f23a92426da0cde47d20e149b1&afSmartRedirect=y

PS: I had some signal integrity problem with the gen 3.0 riser, I suggest using the gen 4.0 riser even if the pcie card installed supports only gen 2.0 or 3.0

PCIe x16 riser: https://it.aliexpress.com/item/1005007045074208.html?spm=a2g0o.order_list.order_list_main.23.bf3c3696Dwy9Oe&gatewayAdapt=glo2ita

PS: Photos of the risers are in the collection in case the links stop working.

Printed parts:
- x1 backplate (with or without DB9 cutout)
- x1 base
- x4 spacer

Print instructions:
PLA, 0.2 mm layer height, 25% gyroid infill, and 4 perimeters worked fine for me.
It could probably be printed with less infill and fewer perimeters, but your mileage may vary.
Use only build plate supports and make sure NOT TO USE support inside the small PCIe card slot on the backplate.
(Soft PLA inside a hot PC case is not a problem; I’ve used it for a couple of years and never had any issues.)

Assembly instructions:
1) Insert the threaded inserts into the correct holes (x9 in the base and x3 in the backplate).
2) Screw the two risers to the base using the M3x16 screws and washers on top, along with the 4 spacers.
Make sure to use the holes closest to the cable for the x16 riser — the x16 riser cable should stay on top of the x4 riser.
3) Insert the two PCIe cards into the backplate. The first time, this might require some force; go slowly and clean the small slot with an X-Acto knife if necessary.
3b) If you want to use the DB9 cable adapter, this is the time to screw it into the backplate cutout.
4) Screw in the PCIe cards with the M3x6 screws.
5) Join the two halves — the x16 riser cable should pass between the two cards. This is a tight fit, so make sure to insert both cards into their slots at the same time.
6) Screw the two halves together with the M3x10 screws. If the holes don’t line up, check the riser alignment and make sure everything fits before tightening — forcing them could damage your hardware.
7) Mount it in your PC. Connect the smaller riser first and the larger one afterward. Insert the assembly slowly in the pc without forcing it.
8) Secure the risers with the PCIe card screws.
9) Done! In true Prusa fashion — if the PC powers on without any problems, reward yourself with some gummy bears. Congrats!

IMPORTANT NOTICE:
Not every PC case is compatible — some may require modifications.
Your case needs to have 7 PCIe slots without small metal bars between them.
Also, the USB 3.0 connector on the motherboard might interfere with the risers and may require a low-profile extension.
Do your research and make sure this mount will fit your PC before printing.