Spine dragchain - improvements

This is a remix of Maxdarkdog's Spine dragchain. I liked the design and decided to print some links as experiment. After the print I had some suggestions and instead of asking for them to be implemented I decided that it would be easier to make them myself, print and test clearances and such.
I had to recreate the files in FreeCAD for easy editing so you also get the source as well.
The changes I added and why (from right to left):
1) chamfer at the bottom edge - no elephants foot and clean, straight contact surface
2) cut the round surface - no sharp bottom side, no overhang at the top.
3) slanted surfaces of the inside where clips reside - no bridging while printing
4 top) chamfer at the inner edge for less friction from the sharp edge
4 bottom) bottom part of the cylindrical part starts at 45deg - no overhangs
5) lip at one end of the smallest clip - easy opening
6) chamfer on inside edges of the clip - less chafing on cables

The parts are compatible and intercha