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https://www.thingiverse.com/thing:2896891
Microscope darkfield stop filter openscad adjustable by Brian_Norman is licensed under the Creative Commons - Attribution license.
http://creativecommons.org/licenses/by/3.0/

# Summary

This is put on your condenser of your microscope to give dark ground illumination.
using OpenScad and the instructions in the file you can adapt the file to fit any microscope and any lens.

I have added a three armed version and a curved arm version.

# Print Settings

Printer: He3D reprap DIY
Rafts: No
Supports: No
Resolution: 0.1mm
Infill: 20%

Notes: 
This is very thin and flat so just print on bed without support and without rafts etc.
I printed this with red fillament - but best to print with black or paint black(matt if possible).

I would encourage you to download the Openscad file and edit the numbers to match your microscope.

# Post-Printing

![Alt text](https://cdn.thingiverse.com/assets/c0/8b/6e/05/31/IMG_5497.JPG)

depends how good your printer is - but you may have to remove tags - doesnot take long to print.

![Alt text](https://cdn.thingiverse.com/assets/bd/b9/a9/41/ae/IMG_5512.JPG)
Spray painted it Black - using old car paint lying around.

# How I Designed This

I would encourage you to download the OpenScad file - and hopefully it is self explanatory.
outer circle is one cylinder take away another, add an inner cylinder and two cuboids ( although openscad insists on calling them cubes with different sized sides - terrible maths).
then generalise by putting in variables.