# Bug? Danged If I Know **URL:** \ **Category:** General Discussion\ **Created:** [February 25, 2023, 2:10pm UTC](https://klipper.discourse.group/t/bug-danged-if-i-know/6888 "2023-02-25T14:10:03Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![gene1934](https://avatars.discourse-cdn.com/v4/letter/g/3d9bf3/32.png) [@gene1934](https://klipper.discourse.group/u/gene1934)\ **Post date:** [February 25, 2023, 2:10pm UTC](https://klipper.discourse.group/t/bug-danged-if-i-know/6888/1 "2023-02-25T14:10:03Z")
### Basic Information: Printer Model: two trees sapphire 5 MCU / mks Robin\_nano\_V3.1: `klippy.log` _Fill out above information and in all cases attach your_ `klippy.log` _file. Pasting your_ `printer.cfg` _is **not** needed_ _**Be sure to check our [Knowledge Base](https://klipper.discourse.group/t/about-the-knowledge-base-category-table-of-contents/6228) and in particular [this](https://klipper.discourse.group/t/how-to-trouble-shoot/6326) and [this](https://klipper.discourse.group/t/how-to-ask-for-help/6327) post**_ ### Describe your issue: Trying to get some clearance so I can brush a hot nozzle before starting a print, I’ve added some stuff to the startup stanza in cura 5.2.1 so that it runs the bed down a couple hundred mm’s, giving me time to brush the hot nozzle. looks like this: ;FLAVOR:Marlin ;TIME:52319 ;Filament used: 49.2947m ;Layer height: 0.16 ;MINX:95.136 ;MINY:56.376 ;MINZ:0.2 ;MAXX:204.863 ;MAXY:243.623 ;MAXZ:29.96 ;Generated with Cura\_SteamEngine 5.2.1 M140 S71 M105 M190 S71 M104 S245 M105 M109 S245 M82 ;absolute extrusion mode M140 S75 ; set bed temp M190 ; wait for bed temp M104 S245 ; starting hot end temp M109 ; wait for hotend temp G90; absolute positioning G28 ;Home all G1 F750 Z200 ;room and time to clean nozzle ;M420 S1 ;Enable ABL using saved Mesh and Fade Height G92 E0 ;Reset Extruder G28 ;home all again G1 Z2.0 F3000 ;Move bed down M400; wait for this move to finish G92 E0; rezero extruder G1 X9.9 Y20 Z0.20 F5000.0 ;Move to start position G1 X9.9 Y275.0 Z0.20 F1500.0 E17 ;Draw the first line G1 X10.3 Y275.0 Z0.20 F5000.0 ;Move to side a little G1 X10.3 Y20 Z0.20 F1500.0 E33 ;Draw second line should merge G92 E0 ;Reset Extruder G1 Z2.0 F3000 ;Move Bed down ; lift start line, measure for.20mm!!! G92 E0 G92 E0 Cura code to lay skirt follows. Printer starts up ok, But something is killing the heat, so the print dies in the middle of the skirt due to hotend under temp. I look at controller and both heat tally leds are being turned off by something in the above g-code. It might be the M400, I’ve had the same effect using a G4 S60, a command I’ve never had similar results with when I’ve used it on machines I’ve built using LinuxCNC as the driver. G4 is supposed to be a pause, but never shut down something that has been previously enabled, it simply pauses all activity until S or P time has expired. Have I found a (gasp) bug? Cheers, Gene Or is there something else in the above g-code shutting off the heat? ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [February 25, 2023, 3:07pm UTC](https://klipper.discourse.group/t/bug-danged-if-i-know/6888/2 "2023-02-25T15:07:48Z")
Can you please format the code with ![Format](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/6/643ab9def96b03089cfb0c194628129fcc96b3f8.png) Else there is no hint for shuting down the heaters in that code. Would you please share the klippy.log as file in your next post. ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [July 18, 2026, 5:37pm UTC](https://klipper.discourse.group/t/bug-danged-if-i-know/6888/3 "2026-07-18T17:37:01Z")