diff --git a/cuburn/code/iter.py b/cuburn/code/iter.py
index 42b9b2a..d9b5477 100644
--- a/cuburn/code/iter.py
+++ b/cuburn/code/iter.py
@@ -174,8 +174,6 @@ iter(uint64_t out_ptr, uint64_t atom_ptr,
 
     {{precalc_camera(cp.camera._precalc())}}
     if (threadIdx.y == 5 && threadIdx.x == 4) {
-        if (blockIdx.x == 0)
-            printf("Hiya %f\n", {{cp.camera.xx}});
         float ditherwidth = {{cp.camera.dither_width}} * 0.5f;
         {{cp.camera.xo}} += ditherwidth * mwc_next_11(rctx);
         {{cp.camera.yo}} += ditherwidth * mwc_next_11(rctx);
diff --git a/cuburn/render.py b/cuburn/render.py
index 974932e..723fb25 100644
--- a/cuburn/render.py
+++ b/cuburn/render.py
@@ -270,7 +270,7 @@ class RenderManager(ClsMod):
                 256, np.ceil(nts / 256.),
                 self.info_a.d_params, self.src_a.d_times, self.src_a.d_knots,
                 f32(ts), f32(td / nts), i32(nts))
-        self._print_interp_knots(rdr)
+        #self._print_interp_knots(rdr)
 
     def _print_interp_knots(self, rdr, tsidx=5):
         infos = cuda.from_device(self.info_a.d_params,