This is the 3D print file for a solar filter that fits a 100mm Outside Diameter (O.D.) telescope. An additional 2mm is added to accommodate the felt tape that is placed on the inside of the solar film cap, so the actual Inside Diameter will be 102mm.

Make sure you measure the widest part of the telescope! Some have a ring at the front that is slightly larger than the tube.

This model was designed for the Askar FRA-400, but will fit other telescopes with the same O.D.

See this video for more information and assembly instructions:

• 3D Printing Your Own Solar Filter

You can purchase the film and felt tape using my affiliate links below:

• 4"x4" Solar Filter
• 6"x6" Solar Filter Sheet
• 8"x8" Solar Filter Sheet
• 12"x12" Solar Filter Sheet
• 1"W x 1mm Thick Self Adhesive Polyester Felt Tape