3D CAD drawing:
Viewfinder cover, Canon EOS 6D

Contents:

1. Viewfinder cover, drawing and 3D-printing
2. To be continued

Note:
I take no responsibility or liability for what are written here, you use the information at your own risk!

1, Viewfinder cover, drawing and 3D-printing:

Introduction:

It's important to cover the viewfinder of your DSLR camera. If lights find its way in through the viewfinder it will add unwanted photons to your astrophotos. When taking darks, bias and flats it's important too.

The old style cover:

The original cover have been lost for a couple of years. I have solved it by put on a tape to cover the viewfinder. Not nice looking. Can I make my own cover with the 3D-printer ?

Making the CAD drawing:

Start with a 2D drawing of the base of the cover. I also added a hole to have a strap to it.

Pad it out 3.6 mm, 2 mm for the base and 1.6 mm that cover the frame of the viewfinder.

Made a pocket of 1.6 mm from the other side of the cover.

Add one more 2D drawing on top to make the lid that cover the slit.

Pad it 0.9 mm. The slit on the viewfinder is 1 mm wide.

The slit on the cover is 1.6 mm, 0.1 mm extra compare to the holder on the camera.

Rounded off all the edges.

3D-printing:

Direct out from the printer with the help brim still attached it looks like this. The upper part needs a support when printing, but I skipped that and crossed my finger it still will print that part okay. It's a bit complicated to remove the support from a slit this narrow. I 3D-printed this cover as a solid, 100% fill.

Everything that shouldn't be here are removed with a knife and sand paper.

The slit, it's okay but not perfect.

A bit black tape on the inside block the light and also clamp it to the camera.

It fits perfect on the camera, of course it must be printed later with black filament. If I can add a heel that locks it in the correct position later, that would be great. As it's now it can slip out from its position easily (until I installed the tape inside).

Added a little notch to hold it in place. This is version 1.2 and it can be downloaded as a STL file from 3D page.