Concept Extruder
by CidVilas, published
Description
This design redirects the force from the filament into the Washer which is supported by the Plastruder assembly. This makes it much stronger then the threads of the PTFE barrel. Atleast thats the idea.
Please feel free to discuss and comment.
Hopefully this will lead to a more robust extruder!
Update: Added the new minimal additoinal machining design concept with an embedded M6 nut between the upper and lower PTFE barrels.
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I just posted an alt extruder in the MB Operators group today and THEN saw this. It still uses PTFE and after reading this...will have to really push it and see how it holds.
Photo: http://www.flickr.com/photos/m...
Description: http://groups.google.com/group...
Feedback appreciated. Thanks for posting.
Was this the stuff you were thinking of making insulators out of?
http://www.mcmaster.com/#alumi...
I was thinking of designing in a disk shaped piece as insulation for the rest of the head from the nozzle assembly. I really wish I had a powder/inkjet style 3D printer as I could just print all my insulators out :P
well, ive been doing a bunch of extruder tests lately since my origional makerbot extruder failed just like nophead's discription. ive tried captivating nuts but got so much heat transfer up the retaining bolts that i couldnt maintain a temp and ive already started damaging the acrylic in the extruder. I recently tried some air dry ceramic but didnt wait long enough for it to cure fully ( got impatient) and it spalled on heating and then blew the filiment out the side. i just recently tried putting the teflon insilator inside a section of aluminum tubing to maintain the pressure but still got too much heat transfer and im working on the post mortem right now. keep planning on getting some ceramic insulating rod from mcmaster-carr but havent yet.
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well, ive been doing a bunch of extruder tests lately since my origional makerbot extruder failed just like nophead's discription. ive tried captivating nuts but got so much heat transfer up the retaining bolts that i couldnt maintain a temp and ive already started damaging the acrylic in the extruder. I recently tried some air dry ceramic but didnt wait long enough for it to cure fully ( got impatient) and it spalled on heating and then blew the filiment out the side. i just recently tried putting the teflon insilator inside a section of aluminum tubing to maintain the pressure but still got too much heat transfer and im working on the post mortem right now. keep planning on getting some ceramic insulating rod from mcmaster-carr but havent yet.
Was this the stuff you were thinking of making insulators out of?
http://www.mcmaster.com/#alumi...
I was thinking of designing in a disk shaped piece as insulation for the rest of the head from the nozzle assembly. I really wish I had a powder/inkjet style 3D printer as I could just print all my insulators out :P
The problem I found when trying to apply compression to PTFE, in a similar arrangement to this, is that PTFE loses all it strength when hot the, so you no longer have a tight seal. I.e. it creeps.
See http://hydraraptor.blogspot.co...
I had more success with PEEK but I think stainless steel is the way to go.
Hey Nophead,
Thanks for commenting. I see what you mean. I was somewhat concerned with that being an issue, but i didnt think PTFE would have done that poorly. PTFE is used in the semi-conductor industry in some very intense processes both heat and chemicals.
How about the newer design i posted? Do you believe this would work? Simply remove the Lower PTFE portion and the real force is being exerted on the M6 Nut. The rod is then tightened into the PTFE to make a seal. Metal on metal is definitely a safe bet.
I don't have much experience with PEEK, but i definitely plan on making some contributions so ill experiment with it.
3 Days and i already killed my makerbot 4 times. Motors, pulleys, and acrylics pieces. Its really exciting! :-P Fixing the extruder is priority one at the moment. Otherwise i am stuck. :(
I just posted an alt extruder in the MB Operators group today and THEN saw this. It still uses PTFE and after reading this...will have to really push it and see how it holds.
Photo: http://www.flickr.com/photos/m...
Description: http://groups.google.com/group...
Feedback appreciated. Thanks for posting.