Segmented Dew Shield for Skywatcher 300PDS Newton telescope

Design
 

It's very difficult to get a Dew Shield for an 300 mm Newton Telescope (Skywatcher 300 PDS). But printing it is also not possible for much people because it would demand a 3D-Printer with a printable area of 400x400 mm.

Therefore I designed a segmented Dew Shield for printing with printable area size about 230x200x230 (maybe smaller possible, check it out). Printing only 220 mm, such as with a Prusa MK4, or even only 210 mm (Prusa MK3?) should normally not be a problem.

Assembly

It was necessary to split the Shield in 4 segments over diameter and total 8 segments to get the dew shield fixed on the telescope.
Line the inside with adhesive film black Velour Velvet fabric.

You will need to print 8 segments and screw them together with 16 bolts M4x12 and 16 nuts M4. Be cautious not to tighten too much - the wall is not very strong. 

Mounting on the telescope

The dew shield should fit tightly enough to use without fixating. If it's too tight lossen one screws a little bit until demanded fitting. If you nevertheless want to fix the dew shield more secure on the telescope it is possible to tighten the bracket on the extension to the screws of the secondary mirror. If so you can cut the wall on the marked position with a knife for easier fixation, otherwise you have to thread the cord or rubber through the opening.
 

Printing

Recommended to print with PETG. Layer height 0.3 mm leads to shorter printing times.

IMPORTANT: adhesion is very very important. Print with brim, not too small (Orca Slicer does a good job with Auto-Brim) and NO GAP between the part and brim!!! Of course it's a pain to get the edge of the part down, but it's worth it, it saves throwing almost finished printed parts in the trash.

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