To clean the ABS out of teflon just heat it up. Around 230C the ABS will turn to honey and pour out. Around 270C the teflon might get a little soft but it won't get seriously soft until 300C.
So maybe just put it in an oven?
Or just cut off the piece of ABS and print it out by pushing PLA through from the back. 240C is a great temp to print both ABS and PLA so I would use that temp and print an entire robot before declaring it mostly ABS free.
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gr5 2,094
Yes - do that. It's really very easy. I like 180C when turning the nozzle.
I recommend doing a "cold pull" or "atomic method" first - heat to 180C, insert some PLA until it's coming out the tip, then cool to 90C and as soon as temp hits 90C pull it out the back (release the filament first - pull with hands, not gear).
This will leave you with a clean, empty nozzle before removal. But really is not necessary.
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