I got my Qidi Tech 1 for free and have been using it for tinkering and learning about 3d printers; I've hardly printed on it at all other than to test any modifications I may have made. The next thing on my list is to upgrade the Z axis. I thought about buying the rods and linear bearings but I don't feel confident enough to DIY it myself. I would have to drill permanent holes into the platform and that would mean irreparable damage if I fail.

Qidi Tech does have some replacement parts available but not a replacement platform or rod assembly.