I was having problems programming an ESP8266 with test clips and having the DuPont connectors from my TTL cable fall off. I tried a couple of examples for connectors but they had issues. This one has the following features:

• Fully parametric through OpenSCAD
• Ledge either side so the end walls have support
• Longer to allow some amount of cable flex
• No indents to hold cable so those of us with low end printers have an easier time of it
• Friction fit based not tab based

Picture shows prototypes with various different settings. I found 2.89mm the ideal size for friction fit 2.54mm pitch DuPont connectors.

Monoprice

Select Mini

No

No

0.175

100

Small connector so I used 100% infill to make it solid.