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This is a nice
small test item to check the tolerances of the printer, and end
up with a very handy and useful part when finished. Many of the
small plastic caps which are usually included with a telescope
occular when you buy it get separated and lost. This is the replacement,
and can be printed up as needed. Suprisingly, the PLA used did
very well on the compression fit and keeps the dust and moisture
out.
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Rendered
here in Solid Works as a semi transparent cap, you can easily
see the four ridges that have been added. The tube of the eypeiece
rides on these and forces them outward to give a good springy
fit. I used a precision dial caliper to measure a cap from Televue
Optical that came with our Nagler eyepieces and the numbers worked
well here even though the PLA is more rigid than polyethelene. |
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The
cap on the left is the 3D printed cap, and on the right is the
original Televue cap I modeled my drawing after. I now have caps
for ALL my eyepieces! |
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Shown
here is the PLA cap fitting perfectly on a Televue Plossl occular. |
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