Cheshire Collimatinator 1.25" Focuser

thingiverse

Here's a Cheshire collimator to align the mirrors in your Newtonian telescope. I am a beginner hobby astronomer and needed to collimate my telescope. I didn't want to buy one and wait for it to be delivered so I thought, "I have a 3d printer, I should be able to make one..." After searching Thingiverse for something to do the job and not being happy with the offerings I found, decided to model my own. When you print the target make sure your settings are to print at actual size, 100% scale, or however it worded on your printer settings. Cut it out carefully, and use an X-Acto knife or something similar to cut out the hole in the middle. I glued mine in place using ordinary glue stick. Here are a few collimation tutorials: https://garyseronik.com/a-beginners-guide-to-collimation/ https://www.skyandtelescope.com/astronomy-resources/how-to-align-your-newtonian-reflector-telescope/ https://lovethenightsky.com/telescope-collimation-for-complete-beginners/