# Taz 5 Extruder Issue **URL:** \ **Category:** LulzBot TAZ\ **Created:** [July 12, 2016, 1:37pm UTC](https://forum.lulzbot.com/t/taz-5-extruder-issue/3715 "2016-07-12T13:37:37Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![mschmotz](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mschmotz](https://forum.lulzbot.com/u/mschmotz)\ **Post date:** [July 12, 2016, 1:37pm UTC](https://forum.lulzbot.com/t/taz-5-extruder-issue/3715/1 "2016-07-12T13:37:37Z")
Hi Guys, I have a slightly modified Taz 5 (larger fan) that is having extruder issues. **The Problem:** Hot end stops extruding mid print causing a failed print (Please see pictures) [http://m.imgur.com/a/5qYfI](http://m.imgur.com/a/5qYfI) **Filament:** Picutured: Esun PLA+ printed at 220 Also Tried: Hatchbox PLA printed at 205 & 210. Argos PLA printed at 205. **Attempts to find a fix:** 1. Updated cooling fan from tiny centrifugal fan 5v to larger fan for hot end. 2. Retuned PID controller for hot end adjusting K values. 3. Removed .35mm nozzle and replaced with .5mm brand new nozzle. 4. Printed at various retraction values starting at 1.5mm going down to 1mm. 5. Triple checked distance between nozzle and print bed to eliminate back pressure. **Conclusion** After all of this I am still not able to complete a full print!! So frustrating. I am going to try an switch out the thermocouple tonight to see if its a bad one but otherwise I think Im outta luck ☹ ---
**Author:** ![piercet](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/piercet/32/12_2.png) [@piercet](https://forum.lulzbot.com/u/piercet)\ **Post date:** [July 12, 2016, 1:43pm UTC](https://forum.lulzbot.com/t/taz-5-extruder-issue/3715/2 "2016-07-12T13:43:46Z")
what voltage is the larger fan? specifically is it a 5v fan, or a 12v fan? the picture looks like PLA bore lock to me which would indicate inadequate barrel cooling of the hotend. ---
**Author:** ![mschmotz](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mschmotz](https://forum.lulzbot.com/u/mschmotz)\ **Post date:** [July 12, 2016, 2:06pm UTC](https://forum.lulzbot.com/t/taz-5-extruder-issue/3715/3 "2016-07-12T14:06:05Z")
> [@piercet](#): > > what voltage is the larger fan? specifically is it a 5v fan, or a 12v fan? the picture looks like PLA bore lock to me which would indicate inadequate barrel cooling of the hotend. Thanks for writing back! Im at work right now so I cant check till this evening but that fan came specifically off this kit (I had it laying around). > **[Amazon.com: Reprapdiscount, Hexagon Full Metal Hot End, Hotend, 3mm.4mm Nozzle :...](https://www.amazon.com/Reprapdiscount-Hexagon-Hotend-3mm-4mm-Nozzle/dp/B00MNUFIGG)** > > The Hexagon all metal hotend can be used up to 300C to extrude Polycarbonate, Nylon, PLA, ABS and more. This package comes with a silicon heating-block cover for heat insulation and temperature stability. Active cooling is required with a continuous... Could you recommend an upgrade fan I could use? looks like the Taz 6 has a large one mounted to it. Thanks again ---
**Author:** ![mschmotz](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mschmotz](https://forum.lulzbot.com/u/mschmotz)\ **Post date:** [July 12, 2016, 2:22pm UTC](https://forum.lulzbot.com/t/taz-5-extruder-issue/3715/4 "2016-07-12T14:22:59Z")
> [@piercet](#): > > what voltage is the larger fan? specifically is it a 5v fan, or a 12v fan? the picture looks like PLA bore lock to me which would indicate inadequate barrel cooling of the hotend. Hey piercet, your right its a 12v fan. 😠 Think if I change out the fan for a 5v this issue will go away? :crosses fingers: ---
**Author:** ![piercet](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/piercet/32/12_2.png) [@piercet](https://forum.lulzbot.com/u/piercet)\ **Post date:** [July 12, 2016, 3:07pm UTC](https://forum.lulzbot.com/t/taz-5-extruder-issue/3715/5 "2016-07-12T15:07:33Z")
> [@mschmotz](#): > > > [@piercet](#): > > > > what voltage is the larger fan? specifically is it a 5v fan, or a 12v fan? the picture looks like PLA bore lock to me which would indicate inadequate barrel cooling of the hotend. > > Hey piercet, your right its a 12v fan. 😠 > > Think if I change out the fan for a 5v this issue will go away? :crosses fingers: That should help. With a 12v fan on a 5v feed, full power is only going to give it a bit less than half throughput.