It is my understanding that, retrograde though it be, USB Mini is something of a de facto cable standard in the MX keyboard world, especially when it comes to custom cables.
I’m working on a design that will have a USB Mini port on it and I’m trying to figure out how large to make the hole that accommodates the connector end on the cable. I know these are oftentimes made as custom parts that have shrink-wrap on the ends as a kind of hand-made custom strain-relief bushing, so I can’t necessarily just follow the USB spec. Can anybody provide me with any guidance on how big I should make my port hole such that it can accommodate the largest (plausible) USB Mini cable end size?
On the Heavy-6, I used 12.2mm x 9mm. I haven’t heard any complaints about people with cables not fitting, but then again I figure most people there are probably just using the stock FC660C cable, so it may not be representative.
Ok, so I measured all my cases that use USB mini on the PCB & here is what I came up with.
RedscarfII+ ver. C - 15mm wide, 10mm tall
ADK64 - 14mm wide, 11mm tall
Clueboard - (aluminium) 14mm to 14.5mm wide tapered smaller on the bottom, 10mm tall
Clueboard - (acrylic) 11.5mm to 16mm wide tapered smallest on the inside, 12mm tall
Leopold FC660C - 12mm wide, 9mm tall
Leopold FC660M - 15mm wide, 9mm tall
NIU mini - 14mm wide, 10mm tall
ACR60 - 10mm wide, 6mm tall
Sentraq 60% sandwich case - 10mm wide, 11mm tall
KBDfans heavy aluminum case (Lambo clone) - 10mm wide, 6mm tall
XMIT HE KB ver. 1 bamboo case - 10mm wide, 5mm tall
Most of these cases are setup so that the USB mini cable doesn’t have to fit in up to the sheathing, but other than the smallest ones they would mostly accommodate stock USB cables with thicker plastic housings around the mini connector. I measured a bunch of those also just to see what they average & 10mm wide by 6mm or 9mm tall are what the majority of them measure. Not sure if that’s a standard or not cause I also have few bigger & smaller ones, but most generic plastic USB mini cables I have came out to those two measurements. Hope this info helps some!