# BLTouch probe and filament **URL:** \ **Category:** Creality Ender 3 / 3 Pro / V2\ **Created:** [October 26, 2021, 1:57am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196 "2021-10-26T01:57:27Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![dlazar](https://3dps-assets.b-cdn.net/letter_avatar_proxy/v4/letter/d/4bbf92/32.png) [@dlazar](https://3dprintingspace.com/u/dlazar)\ **Post date:** [October 26, 2021, 1:57am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/1 "2021-10-26T01:57:27Z")
When running, my BLTouch probe stays lit red. Is that normal. It seems to work fine, but it strikes me as strange that when printing, it stays lit red. When the auto-level process is taking place, filament keeps dropping out of the head. Not a lot, but a few cm here and there. The bad thing is, once printing started, this messy gob decided to fall off into the fresh, hot skirt material. What is the secret to having no filament extruded while the printer is levelling, so that when printing starts, the head is clean? ---
**Author:** ![mobiobi](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/mobiobi/32/7960_2.png) [@mobiobi](https://3dprintingspace.com/u/mobiobi)\ **Post date:** [October 26, 2021, 2:16am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/2 "2021-10-26T02:16:55Z")
I used some “Flexible-Adhesive-Manual-Print-in-Place-TPU-Like-Ribbon-Filament”, FAMPPTLRF, for short (some call it electrical tape) to cover most of it, I have my nozzle at 120C for leveling, and I do a purge of 30mm on my purge slide before every print. ![20211025_201243](https://storage.3dprintingspace.com/original/2X/3/3c3af359496f6129658e8d903419f25fe9709d3c.jpeg) ---
**Author:** ![dlazar](https://3dps-assets.b-cdn.net/letter_avatar_proxy/v4/letter/d/4bbf92/32.png) [@dlazar](https://3dprintingspace.com/u/dlazar)\ **Post date:** [October 26, 2021, 2:49am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/3 "2021-10-26T02:49:42Z")
An interesting way to counter the red-light. I can only assume this means that if it stays lit for you, and for me, then anecdotally anyway, this is normal operations? ---
**Author:** ![Glenn](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/glenn/32/728_2.png) [@Glenn](https://3dprintingspace.com/u/Glenn)\ **Post date:** [October 26, 2021, 3:02am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/4 "2021-10-26T03:02:09Z")
mine does stay lit. I start every print with a purge line that gets rid of any ooze ---
**Author:** ![mobiobi](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/mobiobi/32/7960_2.png) [@mobiobi](https://3dprintingspace.com/u/mobiobi)\ **Post date:** [October 26, 2021, 3:27am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/5 "2021-10-26T03:27:19Z")
Yeah, I think so. Like Facebook, always wants everyone to look at it. ---
**Author:** ![mobiobi](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/mobiobi/32/7960_2.png) [@mobiobi](https://3dprintingspace.com/u/mobiobi)\ **Post date:** [October 26, 2021, 3:32am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/6 "2021-10-26T03:32:50Z")
> **[BLTouch Cover Protector (Remix) V2 by Pheelix14](https://www.thingiverse.com/thing:4400925)** > > Update: 10-26-2020 > New Version is out. BLTouch Cover V2.2 > This Version will not be updated anymore. > Version 2 of my Other BLTouch Remix. Just a few Adjustments. > There are 4 variations. You will have to find out what one will work for you depending... ---
**Author:** ![kitedemon](https://3dps-assets.b-cdn.net/letter_avatar_proxy/v4/letter/k/ecae2f/32.png) [@kitedemon](https://3dprintingspace.com/u/kitedemon)\ **Post date:** [October 26, 2021, 9:32am UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/7 "2021-10-26T09:32:40Z")
Yes it is normal to be lit. The ooze is also typical I have found cheaper hot ends seem more prone than better ones with finer tolerences. My E3d (not cloned) drools slightly a 8 mm ooze thats it. The cloned E3d has a drool of many CM I am careful to grab it as it starts to print. One of the reasons why I replaced the whole hot end from a clone volcano to a real volcano and the BMG wind. It just works better. I was not using an ender so it might not be appropriate to use that model, but the cloned hot ends are poor copies of the orginal IMO. ---
**Author:** ![dlazar](https://3dps-assets.b-cdn.net/letter_avatar_proxy/v4/letter/d/4bbf92/32.png) [@dlazar](https://3dprintingspace.com/u/dlazar)\ **Post date:** [October 26, 2021, 1:20pm UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/8 "2021-10-26T13:20:50Z")
Hi. What is a purge command? I can easily insert one into my gcode file, and I am guessing it would come before my M420 S1 or G29 if I re-level the bed. If I am not mistaken I read that one can keep the hot end temperature LOWER than full melt during these commands, and only raise it to operating temperature once leveling is done? I am not sure of that recipe, but that also makes some sense. ---
**Author:** ![mobiobi](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/mobiobi/32/7960_2.png) [@mobiobi](https://3dprintingspace.com/u/mobiobi)\ **Post date:** [October 26, 2021, 2:00pm UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/9 "2021-10-26T14:00:35Z")
I level at 120/50, then up to print temp, and purge right before printing. Before I had a bucket, I used a couple rounds of skirt to purge. ---
**Author:** ![dlazar](https://3dps-assets.b-cdn.net/letter_avatar_proxy/v4/letter/d/4bbf92/32.png) [@dlazar](https://3dprintingspace.com/u/dlazar)\ **Post date:** [October 26, 2021, 2:14pm UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/10 "2021-10-26T14:14:51Z")
My printhead dragged a chunk of plastic around, during the laying out of the skirt, and it finally fell off, in the still hot skirt material, making it a great candidate for ruining the start of a print. So for me, it is important I learn how to ensure my hot end begins it’s long journey clean, and not dragging around the dregs of whatever was squeezed out during warm-up and bed levelling etc. So I guess I need to learn how to control timing and hot end temperatures better in my gcode. ---
**Author:** ![mobiobi](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/mobiobi/32/7960_2.png) [@mobiobi](https://3dprintingspace.com/u/mobiobi)\ **Post date:** [October 26, 2021, 2:30pm UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/11 "2021-10-26T14:30:04Z")
mmm, I certainly don’t regret setting up a purge bucket/GCode ---
**Author:** ![Jason](https://3dps-assets.b-cdn.net/user_avatar/3dprintingspace.com/jason/32/6148_2.png) [@Jason](https://3dprintingspace.com/u/Jason)\ **Post date:** [October 26, 2021, 4:02pm UTC](https://3dprintingspace.com/t/bltouch-probe-and-filament/3196/12 "2021-10-26T16:02:10Z")
The red light on the BLtouch is normal, being on is a good thing. Technically the blue light is also on but the red floods it out . as for your oozing here is a very quick start Gcode that will help. I pulled it out of one of my ender startup scripts G90 ; use absolute coordinates M83 ; extruder relative mode M104 S120 ; set temporary nozzle temp to prevent oozing during homing and auto bed leveling M140 S[first\_layer\_bed\_temperature] ; set final bed temp G4 S10 ; allow partial nozzle warmup G28 ; home all axis G29 ; auto bed levelling G1 Z50 F240 G1 X2 Y10 F3000 M104 S[first\_layer\_temperature] ; set final nozzle temp M190 S[first\_layer\_bed\_temperature] ; wait for bed temp to stabilize M109 S[first\_layer\_temperature] ; wait for nozzle temp to stabilize G1 Z0.28 F240 G92 E0 G1 Y140 E10 F1500 ; prime the nozzle G1 X2.3 F5000 G92 E0 G1 Y10 E10 F1200 ; prime the nozzle G92 E0 hope this helps