Removing filament from the Aerostruder

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b-morgan
Posts: 116
Joined: Fri Aug 11, 2017 8:53 am

Removing filament from the Aerostruder

Post by b-morgan » Mon Mar 26, 2018 1:20 pm

I keep having an issue when removing filament from the Aerostruder.

After retracting the filament until the hob bolt doesn't make contact, one of two things happen:
  1. There's a long thin string of filament going down towards the nozzle. I try to manually pull the filament out but this string prevents it.
  2. There's a thicker blob of filament that won't go through the hole in the top guide.
I've tried using "Change Filament" from the LCD and manually moving the extruder. I've tried at full nozzle temp and at 122 degrees (so Change Filament still works).

What I end up doing is to get into the space between the hob bolt and the upper filament guide with a pair of flush cutters. Then I have to fish out the lower pieces with tweezers and compressed air.

What am I doing wrong?

ScottW
Posts: 445
Joined: Thu Dec 10, 2015 1:00 pm

Re: Removing filament from the Aerostruder

Post by ScottW » Mon Mar 26, 2018 2:19 pm

I've had similar problems. The process that works 99% of the time for me:
(1) Heat to extrusion temp,
(2) Slowly extrude a small amount (~5mm), then immediately
(3) Slowly and steadily retract, continuously, pulling upward slightly on the filament so that when it clears the hob it pulls out of the idler assembly. If it stops moving upward at any time during #3, reverse direction until a little extrudes from the nozzle, then try #3 again.

This process does result in a "long thin string" as you observed, but that hasn't been a problem for me -- the string just pulls out, and if any is left in the filament path, it hasn't cause any problems feeding new filament.

I found out REAL FAST not to try a "cold pull" with Aerostruder. I managed to wedge some A910 in the guide tube (the tube between the hob and the heat break) so tight that I had to completely disassemble the extruder and remove the guide tube to clear it.

PeterT
Posts: 143
Joined: Mon Jan 04, 2016 5:50 pm

Re: Removing filament from the Aerostruder

Post by PeterT » Tue Mar 27, 2018 1:29 pm

Agreed. I find this process to work well. In my case, I use Octoprint to control the printer, so I extrude about 5-10mm, then immediately use Retract 60mm to remove. It gets the filament to the top of the hobbed bolt, at which point I can gingerly tug the filament out fairly easily (with fingers crossed).

So far, so good.
Taz 5
Misumi hardened rods and bearings
Piercet Anti wobble Z-nut
Raspberry Pi w/ Octoprint and remote power control
Aerostrudder Head

SensibleDesign
Posts: 1
Joined: Fri Apr 13, 2018 11:55 pm

Re: Removing filament from the Aerostruder

Post by SensibleDesign » Sat Apr 14, 2018 12:04 am

I can easily get the end of the filament into the idler assembly after I retract 60mm. The issue for me is similar to PeterT in that I have to pull it out of the idler assembly with some force. I assume this is because the filament end has protruding edges that cannot fit easily through the idler assembly hole. I've jammed my hand a bunch of times doing this! :cry:

Has anyone found a way to easily get PLA filament to fully remove from this extruder without having to rip it out every time? Please help I feel like I'm doing something wrong.

sssslamin
Posts: 3
Joined: Tue Feb 20, 2018 2:55 pm

Re: Removing filament from the Aerostruder

Post by sssslamin » Thu Apr 26, 2018 12:32 am

ummm i have no idea what is going on here.

first time plugging in aerostruder, heat to 230, extude 20mm.

filament instantly grinds

great

try and reverse out

grinds again

use pliers to try and pull , filament wont budge under extreme force but does break so that its flush with the filament guide

great

use metal poker to try and push filament through

wont budge

great

i dont know why i keep giving lulzbot money after my dual extruder v2 that never levelled.

PeterT
Posts: 143
Joined: Mon Jan 04, 2016 5:50 pm

Re: Removing filament from the Aerostruder

Post by PeterT » Thu Apr 26, 2018 8:56 am

This is my fear EVERY TIME I swap filaments. :(
My unit got jammed with woodfill. I haven't used that material since. Shame really, but I'm scared to deal with a jam again.
This extruder is NOT friendly AT ALL!

Is the extruder still under warrantee? You have two options...

1. Disassemble the extruder and remove the material.

2. Contact Lulzbot and have them clear it (this is the option I selected, given the extruder was about 10 days in)

Advantage of taking it apart and reassembling yourself; you learn how to do it, and understand the design constraints a bit better.

Disadvantages; I believe it voids the warrantee, if still in.

Turn around time for Lulzbot was about 10 days all in. YMMV.
Taz 5
Misumi hardened rods and bearings
Piercet Anti wobble Z-nut
Raspberry Pi w/ Octoprint and remote power control
Aerostrudder Head

hammer32
Posts: 2
Joined: Tue Jan 16, 2018 3:19 pm

Re: Removing filament from the Aerostruder

Post by hammer32 » Wed May 16, 2018 4:12 pm

Just finished my first roll of ABS and also found it extremely difficult to get the remaining filament out (hot end at the full 240 degrees). I _think_ it all came out because the end of it was stringy, about the diameter of what get's extruded. However, I can't get the new filament to load much past the gear. I can't turn the gear by hand and using the extrude command results in the gear chewing into the new filament about 5 to 10mm from the end. I was very much spoiled by how easy filament changes were with the stock print head.

kcchen_00
Posts: 1551
Joined: Thu Feb 19, 2015 12:42 am

Re: Removing filament from the Aerostruder

Post by kcchen_00 » Wed May 16, 2018 4:46 pm

With the Titan-type extruders make sure not to print to the end of the spool... Its near impossible to reach the filament once it passes the feed gear.

On the Dual V3, I use a pick or allen wrench to push the filament down the channel by a few 2-3 mm. Then feed new filament through manually by rotating the big gear (hotend at extrusion temp, and motors off). The new filament should catch in the filament channel and push the old filament through the nozzle. YMMV with the Aerostruder.

Its no fun, and one of these days I'll add filament run-out sensors to the my setup.

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