GSO_6_Mirror_Extender.stl

This is a mirror extender for the GSO f/4 6" telescope, which is rebranded by other companies, like Apertura. The focal plane of the telescope normally is 186mm from the tube, this will extend the primary mirror distance to the sensor to make the focal plane at 135mm from the tube, which should also support most coma correctors and not let them block the lightpath. Additionally the secondary mirror is now able to easily support APS-C and potentially even Full Frame cameras, as based on several threads on cloudynights the secondary was not big enough for the lightcone produced by the primary.
Materials required:
3 M4x6mm screws
6 M4x4 Heated inserts with a 6mm diameter (I used these https://www.amazon.com/gp/product/B09ZNX3ZCS)

Recommended to print out of stiff material. PLA does work, but beware warping from heat, however you can print out of HTPLA and that should handle being left in a hot car after annealing.

Highly recommend to also flock this extender, as most plastics do create a shine that can cause minor reflections

Apertura

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GSO_6_Mirror_Extender.stl