Updated Threads SD card holder

I made changes to the threads and changed the over all size slightly. When I printed the original I realized that the treads wasn't printing to well so i went ahead and made it m55x4. More of a normal style thread than what was there I included a .step and the fusion 360 (witch includes the time line of how it was made/modified) so if u want to make changes or add letters on top that u can. The one .slt file is forced to be added so that thingiverse will let me post it cant wait for them to catch up with the times