YALFE V2 - YET ANOTHER LYMAN'S FILAMENT EXTRUDER V2 by Cos

Last crawled date: 3 years ago

PLEASE CHECK YALFE 3!http://www.thingiverse.com/thing:951240
YES, V2 IS HERE!
Of course, it follows Lyman's ideas on spooling, but with some new ideas on cooling and spooling the filament.
This work is now working correctly (as of 30/3/2014)
Subsystems:
Extruder.
-It is the original YALFE but with the new voltage regulator.
-i also pulled 12v to supply the other sub systems.
Cooling.
-i used air flow from a big fan. Fan dimensions will follow
Pulling.
-I substituted the rollers with a simple foam wrap. i warped them around a 8mmthreaded rod. it works well but cannot stand hot filament. Silicone rollers work awsome, if you can find 35mm diam of silicone rod. Just drill a hole 7,5 mm and screw the 8mm thread.
Now i am using Polyurethane rollers from 35mm dia polyurethane rod. Same principle with silicone rollers. It pulls great!
-I used simple voltage regulators to regulate motor rpm, my idea seems to work fine. i just need to make it cooperate with extruder's speed.
-The motor regulator i fount, is like this.. http://www.ebay.com/itm/CCM6N-Dc-Motor-Speed-Regulator-6v-12v-24v-200w-Reversing-switch-/161001883584?pt=LH_DefaultDomain_0&hash=item257c75c7c0
-The motor is the cheapest geared motor at 12v.
Spooling.
I used the thing http://www.thingiverse.com/thing:29526
i modified some parts to make them work with motor.
The spooling motor (12v) is a loot form an old inkjet, also the timing belt.
Both were taken from the x carriage that was driving the printer head.
Fotos show the setup.
More to follow.UPDATE 1/3/2014
I finally got the time to give some thought to the pulling problem and i concluded that it is better to purchase another geared motor with lower rpm. Besides, the one i currently have (12v, 120rmp) was from another, abandoned project.
So while waiting for the correct motor (12v, 10 rmp), i put the final touches on the mini shredder that will make the ''YALFE V2'' a complete recycling system for 3d printers.UPDATE 1/4/2014
Filament extrusion and spooling successful!
i let the machine work for 9 hours (all night) and extruded all the pellets.
However, a minor accident i had at the end of extrusion, let the machine work without pellets for about 2 hours. This made me think of some safety features that i have to apply, in order to let the machine work all night unattended but with safety.
I will explain them at the final version of YALFE, the
MO.RE.SYS 3D (modular recycling system for 3D printers).
The tested plastic was HDPE for water piping (this was the only type of plastic for extrusion that i got for free)
extrusion temp was at 270~295 C.
Tolerances were a bit tricky, i got a fluctuation between 2,6 and 3,0 periodically but not more or less than that. Ovality, on the other hand had the same fluctuation and seemed to counterbalance the tolerance.
i mean that if, for example, i measured 2,6 on one axis, when i rotate the micrometer by 90o at the same spot, the other axis was 3,0 and vice-verse. This means that even with this tolerance play, the mean diameter is stable!
In MORESYS 3D i will explain with every detail on how to tune the pid controller, how to set the machine, how to set the safety equipment for overnight, unattended extrusion etc. Stay tuned!