TAZ 5 with unusual problem. Need help

A forum dedicated to the stock LulzBot TAZ 3D Printer
Post Reply
penn1793
Posts: 36
Joined: Thu Jan 21, 2016 9:42 pm

TAZ 5 with unusual problem. Need help

Post by penn1793 » Wed Feb 06, 2019 8:06 pm

I have a TAZ 5 with an E3D Titan Aero PRO tool head. A few days a go I had an issue with thermal runaway, but resolved it with a replacement thermistor. Now there is another problem. When I print a part, the first 30 minutes have no problem. However, after around half an hour, the filament starts slowing down then stops coming out of the nozzle. Ive tried multiple filaments, different temperatures, and adjusted the blower fan, but nothing works. The extruder motor continues to rotate, so it is not that. I even have a second backup Aero too head, but did the same thing. What could be causing this?

penn1793
Posts: 36
Joined: Thu Jan 21, 2016 9:42 pm

Re: TAZ 5 with unusual problem. Need help

Post by penn1793 » Wed Feb 06, 2019 9:46 pm

Does anyone have an idea how to solve this? I am getting frustrated with this

kcchen_00
Posts: 1699
Joined: Thu Feb 19, 2015 12:42 am

Re: TAZ 5 with unusual problem. Need help

Post by kcchen_00 » Thu Feb 07, 2019 12:58 am

What filament type?

Try increasing extrusion temp by a few degrees and maybe a half turn on the idler. The tightening of the idler will help the extruder push filament through the hotend. Increasing the extrusion temp should ensure the hotend is keeping up with the filament extrusion speed.

nopick
Posts: 1003
Joined: Mon Sep 09, 2013 11:14 am

Re: TAZ 5 with unusual problem. Need help

Post by nopick » Thu Feb 07, 2019 1:49 pm

If you are printing PLA at low extrusion rates, you could be having some heat creep induced jams. Reducing retraction to the minimum necessary, increasing layer thickness or print speed to increase flow rate, cooling the room and adding larger hotend cooling fans are all things that can reduce the heat creep problem.

Also, installing the heat brake into the heatsink while the heatsink is hot can help increase contact between the two parts, improving heat dissipation.

penn1793
Posts: 36
Joined: Thu Jan 21, 2016 9:42 pm

Re: TAZ 5 with unusual problem. Need help

Post by penn1793 » Fri Feb 08, 2019 12:05 am

I am using PLA filament. I usually print around 210, but am trying it at higher temperatures around 220. I have a .8mm nozzle printing at 40 mm/second and at a layer height of .2mm. I set the blower fan to 50%. Does anything seem wrong?

b-morgan
Posts: 287
Joined: Fri Aug 11, 2017 8:53 am

Re: TAZ 5 with unusual problem. Need help

Post by b-morgan » Sat Feb 09, 2019 3:51 pm

PLA loves cooling! Its extremely hard to have too much. For a start, turn that fan up to 100% after the first layer or two.

User avatar
piercet
Posts: 4022
Joined: Sun Aug 25, 2013 1:37 am
Location: Battleground, WA
Contact:

Re: TAZ 5 with unusual problem. Need help

Post by piercet » Tue Feb 12, 2019 3:59 pm

when you took it apart to replace the thermistor, any chance you inadvertently reversed the fan? the fan bracket should be towards the heat sink.

Post Reply