Simple Helical Focuser for Astronomical Telescopes

prusaprinters

<p>This needs to be printed with fine layers, try 0.2mm. &nbsp;Use the test prints first (or even shorter slices in your program) just to be sure it has nice action.</p><p>I might recommend a slightly taller layer height for the inner screw, to prevent the layers from interacting as much between the two pieces.<br><br>&nbsp;</p><figure class="image image-style-align-center"><img src="https://media.printables.com/media/prints/224807/rich_content/bd61c7b9-e049-40a9-8ba7-92feb6d36e49/unkno6wn.png#%7B%22uuid%22%3A%22f5d71644-a7e8-4936-ab99-89f595d52389%22%2C%22w%22%3A683%2C%22h%22%3A509%7D"></figure><p><strong>Bill of Materials</strong><br>-PLA, black (or spray the inside black)</p><p>-Plumber's/PTFE tape for smoother action</p><ul><li>#10-24 nuts, 2-4x</li><li>#10-24 thumb or socket head screws, you really want nylon for these.</li></ul><p>OR</p><ul><li>M4 nuts and thumbscrews/socket head screws</li></ul><p>AND</p><ul><li>Same-sized screws to bolt this to your telescope project.</li></ul><p>I've printed half a dozen of these, and minute differences in filament, layer height, printer calibration can cause big changes in how well it works. &nbsp;Worst case, re-print, sand, or CAREFULLY use hot water to deform the plastic. (With care that the base and eyepiece hole don't deform)</p>