# Contouring problem **URL:** \ **Category:** CAM\ **Created:** [January 14, 2023, 9:48pm UTC](https://forum.grid.space/t/contouring-problem/822 "2023-01-14T21:48:03Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![bongo\_matteo](https://forum.grid.space/user_avatar/forum.grid.space/bongo_matteo/32/891_2.png) [@bongo\_matteo](https://forum.grid.space/u/bongo_matteo)\ **Post date:** [January 14, 2023, 9:48pm UTC](https://forum.grid.space/t/contouring-problem/822/1 "2023-01-14T21:48:03Z")
I dont know what the problem is with this one… I have parsed this stl model before in KiriMoto with no problems. ---
**Author:** ![stewart](https://forum.grid.space/user_avatar/forum.grid.space/stewart/32/21_2.png) [@stewart](https://forum.grid.space/u/stewart)\ **Post date:** [January 14, 2023, 11:32pm UTC](https://forum.grid.space/t/contouring-problem/822/2 "2023-01-14T23:32:12Z")
well, looks like a bug. but it’s been there since 3.0 because I checked every version back to that one. as it happens, I’m working on contouring right now (getting 2x - 20x speedups), so this should be something I can sort out in short order. ---
**Author:** ![bongo\_matteo](https://forum.grid.space/user_avatar/forum.grid.space/bongo_matteo/32/891_2.png) [@bongo\_matteo](https://forum.grid.space/u/bongo_matteo)\ **Post date:** [January 14, 2023, 11:46pm UTC](https://forum.grid.space/t/contouring-problem/822/3 "2023-01-14T23:46:30Z")
You always do… thank you ---
**Author:** ![stewart](https://forum.grid.space/user_avatar/forum.grid.space/stewart/32/21_2.png) [@stewart](https://forum.grid.space/u/stewart)\ **Post date:** [January 15, 2023, 12:57am UTC](https://forum.grid.space/t/contouring-problem/822/4 "2023-01-15T00:57:10Z")
not a bug. you have `skip shadow` turned on and that causes it to miss the slot on the bottom. ![Screen Shot 2023-01-14 at 7.53.55 PM](https://forum.grid.space/uploads/default/original/2X/5/5660090247cad1d8fb7acbe860bffa6a31ab209b.png) when you disable that and it can generate a proper shadow, you get the expected results ![Screen Shot 2023-01-14 at 7.56.40 PM](https://forum.grid.space/uploads/default/original/2X/4/475e55503798c272347cfcb553db36f7d7afa5f7.jpeg) ---
**Author:** ![peterh](https://forum.grid.space/letter_avatar_proxy/v4/letter/p/919ad9/32.png) [@peterh](https://forum.grid.space/u/peterh)\ **Post date:** [January 20, 2023, 10:04pm UTC](https://forum.grid.space/t/contouring-problem/822/5 "2023-01-20T22:04:12Z")
I returned to this post because I am trying to solve what I thought was the same problem - a diagonal cut through the piece - here’s a screenshot after the “rough” - the cut is caused by the bit returning to the start at the end of the operation. I have “skip shadow” set, and have set z clearance to 15 which clearly is being ignored! This is just a test piece I concocted to muck around with carving various combinations of pocketing and tool changes. Haven’t tried any other operation yet and clearly “rough” is the wrong place to start 😉 ![Screenshot 2023-01-21 at 8.02.39 am](https://forum.grid.space/uploads/default/original/2X/f/f55411585a615a06510bc90c926e82d73841251b.jpeg) . ![Screenshot 2023-01-21 at 7.54.55 am](https://forum.grid.space/uploads/default/original/2X/5/52cc26bdcf2cc9dc0a0e3029d7fb23211d3a853e.jpeg) ---
**Author:** ![stewart](https://forum.grid.space/user_avatar/forum.grid.space/stewart/32/21_2.png) [@stewart](https://forum.grid.space/u/stewart)\ **Post date:** [January 20, 2023, 10:31pm UTC](https://forum.grid.space/t/contouring-problem/822/6 "2023-01-20T22:31:31Z")
`Skip Shadow` is causing the collision. It’s meant for contouring-only runs. You could try enabling `Force Z Max` under Output. But unless you have a specific reason to blind KM to the terrain, un-check skip shadow and it should be fine. Let me know if otherwise or just DM your workspace to me so I can play with it.