This is the spacer needed to attach this objective

https://www.amazon.com/AmScope-Plan-Achromatic-Objective-Knurled/dp/B01G4CCGRC/

to a Nikon F-mount camera. Lets you take 4x macro pictures.

to read a review of the objective check here...

https://www.closeuphotography.com/seventeen-dollar-plan-4x-objective/

I have a newer design for crop nikons: https://www.thingiverse.com/thing:5155122

Anycubic

All-metal Mega

No

No

1.5mm

100

The tiny little RMS threads appeared to come out OK even though they were smaller than the print resolution. Be sure not to cross thread the microscope objective onto the adapter.