diff --git a/slicer/stl.c b/slicer/stl.c
index 7922715..3d3f9c6 100644
--- a/slicer/stl.c
+++ b/slicer/stl.c
@@ -59,7 +59,6 @@ static void stl_load_binary(FILE *file, void (*facet)(struct v f[3]))
 		fprintf(stderr, "no number of facets\n");
 		exit(1);
 	}
-fprintf(stderr, "nf %u\n", (unsigned) nf);
 	while (nf--) {
 		n = fread(&tmp, 1, sizeof(tmp), file);
 		if (n != sizeof(tmp)) {