Sharing some experiences… and looking for spare parts
3 Months of PLA/ASB printing resulted in an extruder head blockage
After 3 months of around 3kg’s enthousiastic printing, I noticed that my printer results became less predicatable. Open air gaps in the infill, see the attached foto. So first I thought to exchange the temperature sensor as lowering the speed increased the temperature stability. It was an easy and simple fix but didn’t result in too much improvement. So today I thought: well, it could well be the case that some plastic resedue of previous prints have been collected and formed a blockage in the J-Head. And that hypothesis was being confirmed later… with some nasty side effects.
Disassembling the J-Head
I started to disassemble the J-head. Took just some minutes and was fun to do. Very clearly visable, the PTFE tube was forming a 2mm black ring nearby the nozzle area and also I noticed a rip in the PTFE tube. I cutted away this dark area of the PTFE tube and put the metal parts in acetone. With some copper wire from a electric cable I was able to open the nozzle again and be able to see some light at the end of the nozzle-funnel.
Oeps… I put too much force on the J Head nozzle holder
After everything looked clean again, I started to assemble the head again… but this time with 13mm PTFE tube too short… and in the process of assembling the J-Head I put too much force… and heard a crack. Slightly visible, but its there. Not sure if it will impact the print results, but I’ll see what will happen.
Printing again after cleaning-up
After this removal of the blockage, it looks like the extruder is working like it was in the beginning. But I’m affraid that the crack in the nozzle holder will require a replacement. Also I expect that the PTFE liner tube needs to be lengthy enough to feed the filament properly.
I was looking at the Arduino site and also at the Shapebot site, but couldn’t find any details where and how replace parts for the 1.75mm nozzle can be ordered. Hopefully someone can give me some directions…
- Who knows where I can buy this PTFE Tube (4mm outside, 2mm inside)?
- How to get an assembed hot-end or where to order the grey nozzle holder?
For reference, I’ve attached a picture of the piece which I cut off the PTFE liner tube
Thanks in advance,
Materia 101 Serial #KK0016