I was afraid to lose the cup, but it sounds like a lot more work than just slip casting another one.
I am going to use it for glaze testing as suggested, I did that with other broken pieces. This one was just so slight I thought I'd ask if it was worth saving.
How many of these mugs did you cast the first time? None of the others had any sign of a crack? Just curios.
I made about 14 mugs. All but the one came out of bisquing just fine.