ABS blocked in the extruder

[ascanio 0]

I was trying my first attempt at abs printing after I have installed my custom heatbed, but it did't start extruding. The filament was blocked inside the extruder (i guess in the nozzle part)

This used to happen to me sometimes with pla. I used to normally heat the nozzle, pull out the filament with a little strenght, cut the ruined end of it, put it back again and then manually extrude a bit to "clean" everything out. It worked.

But now the abs filament is litterally blocked, and after heating i can't pull it out, nor push it to try to melt the blocked part. It is justa blocked. How do I clean it out?

Thanks

 

[owen 19]

What temperature have you set the nozzle to pull the filament out?

 

[ascanio 0]

240 as abs should melt. Also tried 250 once but not for more then a little becouse I was afraid of overheting the whole extruder

 

[gr5 2,173]

Your choices are:

1) Clean from below

2) Clean from above

3) Remove nozzle completely and soak in acetone

To do #1 you need something that can enter the nozzle tip. Either acupuncture needle or hypodermic needle. If you don't have those skip to #2 or #3. If you have a needle you can try these instructions (method 1). This also gets you started on the dissassembly and what to be careful of:

http://umforum.ultimaker.com/index.php?/topic/4118-blocked-nozzle/?p=33691

Acetone will dissolve ABS but not PLA. It may take many hours of soaking.