Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2216664.

UPDATE (4/8/2017): This design does not work very well... Print the new version instead. http://www.thingiverse.com/thing:2236597

1" Tubing End Caps - .87" ID - .065 wall thickness

I designed these "mostly" for my build of the MPCNC 525 "J". http://www.thingiverse.com/thing:1671517

One open and one closed. Nice rounded exterior rim.

Maybe thinking ABS would work best? May have to increase scale by 1 or 2%?

NOTICE: At the time of publishing I have not printed and/or tested yet. If you test them before I do please let me know in the comments.