Duncan Mask for telescope collimation
thingiverse
Edit the OpenSCAD file for your specific telescope's dimensions and print your customized Duncan Mask. This mask simplifies collimation of SCT scopes, making it easier to align them properly. It should also work with other types of scopes, but I haven't tested that myself. This design features a "handle" that encircles the secondary retainer. Having this handle makes it easier for me to put on and take off the mask without touching the corrector plate, which helps keep fingerprints away.
With this file you will be able to print Duncan Mask for telescope collimation with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Duncan Mask for telescope collimation.