what do your printed patterns look like?
Are you burning out the printed patterns? Or using a printed pattern to ram sand?
Or were these cast in investment?
Off the cuff I note that the letterforms do not appear to be Drafted… they Should be drafted at least 5 degrees…
The flaw in the S looks like an inclusion flaw. that is, some small bit of the investment forming some narrow detail in a letterform, ( perhaps the missing hollow in the lower loop of the S- or the missing hollow in the “a” ) got knocked loose by the force of the flowing metal and swept into the channel that should form the lower loop of the S.
The Circular flaw in the M is weird… I would have to see the printed pattern, but that does not look like a casting flaw.
The missing hollow in the U and other letters is, again due to either you investment forming a bubble here and not filling in the hollow- Or the investment in the hollow was broken loose by either the inflowing metal- or possibly by the expansion of the printed pattern during burnout.
Can you clarify your process and post pictures of the printed pattern? What resin are you using?