October 25, 2025
Description
When a main mirror mask is attached to the main mirror, the area between the rubber holders is lost. To reduce this area, it is necessary to print a redesigned mirror holder made of TPU with a smaller holder pad.
One of the pictures shows the old and the new mirror mask (142 mm / 146 mm).
3 Parts, total ~ 6 grams, Nozzle 0.4 mm, TPU (around) 95 Shore, layer height 0.2 mm, 3 wall loops, 4 top and bottom shell layers, no support, infill 30%, triangles. Flow/speed how your filament/printer is able to print well. Maybe the flow you can see in the 3mf-file is to high. I can print TPU 95A up to 11 mm³/s, which is very high in relation to what I've read about printing TPU.
~ 10 grams, Nozzle 0.4 mm, material doesn't really matter, PLA or PETG, layer height 0.2 mm or 0.3 mm, 2 wall loops (should be enough), 3 bottom layers, 4 top layers, infill 15%, no brim, circular pattern on top and bottom surface improves printing time.
Painting with black anti-reflective paint or even better cover the top and bottom with an adhesive foil made of black velour velvet fabric.
And don't forget the insides of the rubbers! As you can see in one picture, the printed TPU is quite reflective.
Gently tight the mirror holders. The screwing force will increase strongly as you compress the whole rubber when the rubber pad touches the mirror. Try to move the mirror at each holder from the backside and tight the screws until there is no movement of the mirror any more. Do not tight too much, this induces stress on the mirror and can lead to visual impairments.
Some people recommend taking a sheet of paper, placing it between the mirror and the rubber buffer and pulling it tight until the paper is a little harder to pull out.
FreeCAD files are also published, so feel free to customize the parts to the size you need.
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License:
GNU General Public License v3.0
mechanical0815
