Thursday, September 14, 2006
Also, nylon melts at pretty high temperatures, iirc.
Nylon melts at ~350 C. It may not take a lot of heat, but it will take a high temperature. (I'm not sure what the specific heat in nylon is -- better be low though, if we want it to cool fast enough after depositing it.)
Getting nylon in RepRap is a good thing, I think, for the strength, heat resistance, and low friction.
With nylon, there is another possible alternative to melt-extrusion. Just squirt separate .1mm misty jets of diamine and dicarboxilic acid -- these compounds react and form nylon. This would be an chemical reaction RepRap, rather than a thermo-RepRap.
Hmm, not good. 3000 yards sounds like a lot but, at that diameter, it's nothing.
As for heating, you really just need a very hot point source. No extruding needed when the filament is already that thin. Really just need to melt it enough to stick to the previous layer. Or am I way off on this?
Most soldering irons operate around 200deg~c plus or minux 50, so I'd bet that will work fine.
Although I didn't see clear trimmer line where I went, there was red, green, blue, yellow, and black.
You can break nylon line by rubbing it to heat it up.
Fishing line is basically what you have here but be careful because fishing lines are coated because nylon absorbs water.
Depending on the specific kind of nylon, both my number, and your number is correct.
Conventional piezoelectric ultrasonics is of course way beyond most of our capabilities, but it might be possible with the more old fashioned technology of magnetostriction.
I just did a little experiment.
My hot glue gun will melt into a plastic syringe (nylon I think) but won't melt weed-eater line or fishing line.
Using my hot air gun on low I can melt the latter two but not without the nylon becoming a mass of fine bubbles.
The syringe melt cleanly.
This doesn't bode well for nylon filement reprap unless to have to right type of nylon. Probably end up cheaper to buy the proper stuff in the first place. There might be a low melting point filament out there but beaders, fishermen and weedeaters will all want strong lines which I expect will not work for us.
So for a nylon monofilament the line should be 20/28 lb. test or greater to have a diameter of ~0.444mm to be larger than the standard extruder size. Perhaps there are some modifications that could be made to tighten the extruder feeder and find a smaller diameter extruder head. Then I think there will have to be a modification to the software (settings or code??) to allow for adjustment of diameter.
I think the purchase of fishing line for 3D printing may be expensive if buying the line new since it is marketed towards a particular industry. But there's tons of it that need to be recovered and recycled. There may be properties of the material that may be favorable for 3D printed models.
The great news I gather here is that melting temp. is around 200deg Celcius - which my extruder does reach. Not sure if it reaches 350 C?
Let me know how the other experiments work out and feedback on the comments above for collaboration. I am new to the 3D printing game.
Links to this post: