This clip still needs a bit of modification. If anyone can do CAD, the radii of the loops should be beefed up (look at the other keck clips I have uploaded to see how) so that the clip can be printed with medium infill, because right now this clip printed with solid fill tends to crack at the crest on both front loops but not the rear loop. I don't think there's enough material there right now to print with anything but solid fill. http://en.wikipedia.org/wiki/Ground_glass_joint#Joint_clips Do not use the unlinked keck style for suspending large flasks or large assemblies. (ABS) Clip will weaken at temps of 90C and start yielding around 100C. 14/20 Keck Clip: http://www.thingiverse.com/thing:274395 24/40 Keck Clip: http://www.thingiverse.com/thing:274563