This is a modular stand to hold the XSC G600 electronic microscope. I designed this because the original stand was terrible.
Use 4 x m5 nuts and 4 x m5x30 bolts with hex head to assemble the stand.
The arm-1.stl (orange x 2) and the arm-2.stl (gray x 1) parts are different.
A new adapter for an another cheap microscope:
Helping hands adapter: