Working on it....
Updated and optimized it heavily.
Still working on proper parametrization for larger tube diameters. Feel free to remix!
File is not working in properly customizer, cos it doesnt include the "xxxx.dxf" file. Use OpenScad to customize it.

RepRap

MicroDelta

No

No

tried 0.2 - 0.4 all work

30%

I had sometimes troubles that the z-scar was exactly at the bending point and the devices broke. fiddle around with your slicer to solve it.

I used Inkscape to design the outer shape. exported it properly as a .dxf file.
Then import and extrude in openSCAD. Punching holes for the tubing and adding the squeeze bumbs.

looaads of iterative designs and experimenting around.