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http://www.thingiverse.com/thing:3476080
Skywatcher 130PDS Primary Mirror Back Cover by RolandKol is licensed under the Creative Commons - Attribution license.
http://creativecommons.org/licenses/by/3.0/

# Summary

Skywatcher 130PDS Primary Mirror Back Cover

My scope leaks some Light from the bottom and this cover helps to prevent it.

Clicks In and Fits perfectly (Diameter 150mm)

The central hole is 10mm and left for the bolt, to help to remove the cover it if necessary.
Simple bolt is also included, but you can use any type.

I printed cover at 0.3mm, - bolt at 0.2mm resolution.

P.S.
One model included, which has A Flat First layer is 0.3mm, - I placed it as my printer always messed up while printing the holes.



# Print Settings

Printer Brand: Anycubic
Printer: All-metal Mega
Rafts: No
Supports: Doesn't Matter
Resolution: 0.3
Infill: 33%
Filament_brand: Any
Filament_color: Black
Filament_material: PLA/PETG

Notes: 
I printed cover at 0.3mm, - bolt at 0.2mm resolution.