Tair3A Tube Ring with Guide Scope Fitting
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A tube ring for a Tair3A lens with guide scope fitting on a SkyWatcher 15cm mount plate
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- Physics & Astronomy
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- Creative Commons — Attribution — Noncommercial — Share Alike
I needed a way to mount a guide scope to my 300mm Tair3A lens, which I use for astrophotography.
I had the lens on a SkyWatcher 15cm mounting plate, but due to the mounting hole on the lens, I was able to turn the camera on the mounting plate by hand when attached, so I wanted a way of keeping it straight and secure, as well as attaching the guide scope.
I designed this in Fusion360, the f3d file is attached. It's not fully parametric but you should be able to tweak the parameters.
The inner tube diameter is 69mm. I found this slightly loose when I printed it. You can alter the f3d file, use masking tape to stop it moving, or do what I did: print a 69mm-wide, 3cm-tall TPU cylinder in vase mode to use as a sleeve.
It takes 4x M4 screws with nuts. The holes at top and bottom are for standard ¼" camera screws. No inserts are needed.
I printed in eSun PETG, 0.2mm, 4 perimeters, 50% triangular infil. No supports needed. I suggest printing the pieces separately. I used a 0.1mm fuzzy skin because it adds a nice finish that is more matte-looking and helps disguise layer lines and surface issues.
PETG shrinks a little after printing. I suggest doing a test print of the first 3-4mm first to check fitting.