The EFT machine I used at a Fed Ex store was about the same as SS kiosk. A little finnicky.Problem with roll your own is that if they don't meet requirements they'll be rejected.
When I got my UT out of state permit decades ago it took three times to get a good set, and the instructor had done this lots of times.
I know when I did the Silencer Shop kiosk it took several times before it would accept all the prints.
I haven't done anything with ETF machines though. A lot of UPS Stores have them but I don;t know how finicky they are.