You can follow these steps to import a custom Fritzing parts into Fritzing.
Some custom components such as the Bolt WiFi module are not available by default in the Fritzing parts library. Now I’ll load your breadboard svg and compare something (one of the rectangles probably) between the Illustrator and Inkscape versions and see if I can figure out a scale factor to convert one to the other (I know how to do that in Inkscape if not Illustrator!) so I can scale the connectors that I copied across properly. Most components required to design a circuit in Fritzing are readily available. I think we are talking different DPIs, the svg standard used to be drawing units are 90DPI (Inkscape 0.9.1 and less) it then changed to 96DPI (this being svg drawing units, not display DPI which I think is what the 300 number probably is.) The original Illustrator (which many of the core parts are in) was 72DPI (to match pt) and I don’t know what the latest Illustrator does, (maybe 90DPI against Inkscapes 96?) I have corrected the two connectors (and will check pcb because it is probably wrong too!), you are correct, I must have misread the mechanical drawing because both were wrong. I check with lower DPI, but problem still the same… All I can say, that’s not DPI problem, I edit in 300dpi.
