PCIE/GPU x1 riser mining rig extender platform

TLDR; allows to use both x1 mining pcie risers and ribbon pcie risers on a cheap mining frame, useful for consumer motherboard AI rigs, but can also be used as a stand for an x1 riser.

I recommend cutting off the back wall in your slicer of choice; so the cables can hang freely off of it, but I've left it in, in case someone wants to use it as a stand or extend the back wall etc.

---

If you have a consumer motherboard based AI rig installed inside a mining rig frame; you might have faced the dilemma of these frames being made with only x1 risers in mind, so GPUs installed with a regular ribbon-type riser prevent you from using the crossbar going across the frame where those x1 risers are supposed to rest on top of; but removing that bar or moving it to the back prevents you from using x1 risers in the mix; this is meant as a middleground solution; as to where you can still on the right side use ribbon risers and further away use the regular x1 risers still resting on top of the back bars; without putting stress on the cables going out the back of the riser.

---

inspired by the great idea here: https://www.printables.com/model/357149-riser-gpu-pci-e-for-mining/collections but remade from scratch in freecad since the original model wasn't remixable, due to hundreds of triangles in the base layer from a text embed and nature of STL export; and needed quite a few changes to work for my use-case; this model should serve as a much more pleasant remix base if anyone wants to do anything cool with it; cut it, extend the base, lengthen, shorten, thicken, anything your heart desires.