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Secondary mirror holder/mount for dobson telescope

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Creation quality: 5.0/5 (2 votes)
Evaluation of members on the printability, utility, level of detail, etc.

  • 12.4k views
  • 13 likes
  • 229 downloads

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3D design format
STL Folder details Close
  • Knob_v3.stl
  • Mirror_Holder_v3.stl
  • Vane_part_m4_spider_v5.stl
  • Vane_part_m5_spider_v8.stl

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Publication date 2020-02-04 at 02:19
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Published to Thingiverse on: 2019-08-23 at 19:16
Design number 104560

3D printer file info

3D model description

A simple secondary mirror holder for a diagonal mirror with a minor axis of 4 cm or more.
I designed this secondary mirror holder for my dobson telescope building project using a 203 mm diameter primary mirror and a secondary mirror with 70 mm of minor axis.
This simple diagonal mirror holder has the basic 3 screws at 120 degrees to tune the tilt of the secondary mirror. Rotation and translation back and forward the telescope tube is achieved thanks to the M4 screw.
It is a simple but efficient design.

Update 26/08/2019
I finally ended up painting the mirror mount flat black and I also did a small knob to easily tune the distance back and forward the telescope.
Updated the photos with the painted mount, nicer to look at the finished one!
I added the base part designed for M5 spider vanes for those who prefer a more robust spider vane even if it is not that necessary.

Parts needed
* 3 x cap head screws M3x45mm
* 3 x nuts M3
* 1 x pan head screw M4x65mm
* 1 x flat washer M4
* 3 x nuts M4
* 1 x wing nut M4 or normal M4 nut
* 1 spring
* Threaded rod M4 (for the spider vane)

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