Since the original version was good, but didn't work with my microscope because of the Bottom_Adapter lens diameter, I modified it and posted it here in case anyone else has the same problem. It's basically just the same, but with a wider "hole".
You have to print 3 small bolts and three sliders.

Print Settings

• Printer:
  Ender 3 V3 SE
• Rafts:
  None
• Supports:
  No, but you might need to add them if you're printing at less than 200mm/s
• Resolution:
  0.2mm
• Infill:
  10%, 100% for bolts