Build Instructions

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• 1

  Supplies

  Optical

  • 114 mm primary mirror (700–900 mm focal length)
  • 5-inch PVC pipe

  Electronics

  • Raspberry Pi Zero 2 W
  • Raspberry Pi Camera Module
  • Pi Zero camera cable
  • 18650 Li-ion battery
  • 5 V boost/charge module
  • MicroSD card
  • Push button

  Hardware

  • 3D printed parts
  • Compression springs
  • M8 hardware
  • M5 threaded rod
  • M2 hardware
  • Self-tapping screws
  • Double-sided mounting tape

  All CAD STL files are available in the Astra GitHub repository.

• 2

  Preparing the Parts

  Measure the actual inner diameter of your PVC pipe before printing anything.

  PVC pipes are sold using nominal dimensions, so my "5-inch" pipe actually measured about 5.25 inches internally. I modified the original PiKon models to match.

  I also redesigned several components:

  • Electronics mount
  • Universal tripod mount
  • Smartphone holder
  • Rack-and-pinion camera focuser

  Print the parts using PETG or ABS. PLA can soften in hot weather, potentially affecting optical alignment.

  For the tube itself:

  • Cut it slightly longer than your mirror's focal length.
  • Line the inside with matte black paper or paint.
  • Paint the outside if desired.
• 3

  Justway

  Since a telescope depends on precise alignment of its optical components, dimensional accuracy and print quality are especially important. That's where Justway comes in.
  

  Beyond 3D printing, Justway also offers CNC machining, sheet metal fabrication and injection molding making them a great option for both hobbyists and professional product development.

  If you'd like to fabricate your own Astra telescope, you can simply upload the STL files to their online quotation system, choose your preferred material (I recommend PETG or ABS), and order the parts directly.

  A big thank you to Justway for supporting this project.

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