Enjoy sharp, crisp views without spikes on stars!
Not much to say. Use silicone adhesive, 26 gauge steel wire and haywire twists (or guitar string) with 8 guitar tuners spaced in a square normal to your focuser. The secondary I used is 88mm; in general, the secondary needs to be big enough to conceal the hub behind it.
This has a 4mm offset built into it, but note that collimation adjustments on the back will change that. If you center the mirror in the holder, and center the indicator (indented diamond on top of holder) you will have a 4mm offset built in. Further offset should be managed with the wire spider and a ruler.
I do not have a jig for this yet. I will be making one soon.
Hardware needed:
Make sure to print it sturdy. I used 4-6 walls (0.6mm nozzle) and 30 or 50% cubic infill. (Do note that increasing walls is better for sturdiness than increasing infill, and beyond 50% infill returns are not significant). After all, this has to hold a big piece of glass perfectly still.
Do keep in mind: your glue will affect your offset to the tune of a few mm.
If this jargon means nothing to you, do one of:
I'm hosting the files for my 16-incher for anyone to follow in my footsteps, but these are just provided as-is.
The author marked this model as their own original creation.