Show all posts by user
Safety...
He (mix) is using using a stepper motor in his design because it is capable of constant velocity without needing closed loop control.
A DC motor is not capable of this.
The downside to this is the need for external gearing, and the fact that even with reasonably sized gears, it is difficult to generate the necessary torque from a NEMA 17 stepper if you have the auger even halfway in the melt zo
by
greenman100
-
Plastic Extruder Working Group
He's using a stepper because steppers have open loop speed control built in. Its a tradeoff, because with the feedscrew in the melt zone to promote mixing, you definitely need several N-m of torque - hard to do that on printed gears and steppers.
by
greenman100
-
Plastic Extruder Working Group
Why not buy one pre-machined? They're like $10.
by
greenman100
-
General
If you truly wanted feedback and not eyeballs on your KS page, I think you'd have posted about it before going live with your Kickstarter, no?
by
greenman100
-
General
cope413 Wrote:
-------------------------------------------------------
> 120mm/s with 300mm/s infill on what machine?
>
> Direct drive means you're probably not on a delta,
> and there aren't any cartesian machines at the
> hobby level that can get anywhere near that...
Incorrect, I do 120mm/s perimeters and 200mm/s infill regularly on my Solidoodle 3.
by
greenman100
-
General
weight can be converted to volume using density
volume can be converted to length by dividing by crossectional area
simple math.
by
greenman100
-
General
Joseph Wrote:
-------------------------------------------------------
> So, PeteD, you would not reccomend the extruder
> for PLA? If that is the case then it is really
> bad news since my group is focused on PLA for
> building prototypes.
PLA is just a lot more sensitive to proper preprocessing, like drying. If you handle it properly, it extrudes fine.
by
greenman100
-
General
bobc Wrote:
-------------------------------------------------------
> Micro-fine powders need to
> be obtained from somewhere
by
greenman100
-
General
Karmavore Wrote:
-------------------------------------------------------
> bobc, I'm on the prowl, too.
>
> The best (also: only) place I've found is the
> place linked to by the filastruder website, which
> offers ABS at $8/lb.
>
>
> After non-trivial shipping costs (to a US
> address,) even when placing an order for 20 lbs of
> the stuff, I still can't get the p
by
greenman100
-
General
No experience with the Lyman, but plenty with the Filastruder. +/- 0.05mm on 1.75mm filament is no problem.
by
greenman100
-
General
Karmavore Wrote:
-------------------------------------------------------
> Cool stuff! Is anyone selling their
> filastuder-created filament? I'd buy some, if only
> to see if I'd like to buy my own filastruder!
If you make a post over on Soliforum, I'm sure you'd have lots of takers. I have some I'd sell you but I'll be on travel the next week or so.
by
greenman100
-
General
I'm not talking about impacting prices, I'm saying it is possible to produce filament at home.
NewPerfection Wrote:
-------------------------------------------------------
> greenman100 Wrote:
> --------------------------------------------------
> -----
> > ExtrusionBot hasn't shipped yet, Filastruder
> has
> > shipped over 500 units. Check out some of the
> > peopl
by
greenman100
-
General
ExtrusionBot hasn't shipped yet, Filastruder has shipped over 500 units. Check out some of the people using it:
+/-0.05mm is no problem. Some users report +/-0.03.
Karmavore Wrote:
-------------------------------------------------------
> I don't know which side of the "creating filament
> is easy/difficult" debate is right. But if
> RobertKuhlmann has the right of it, it seems ther
by
greenman100
-
General
thejollygrimreaper Wrote:
-------------------------------------------------------
> i would be more worried about the polymer being
> extruded in these filabots breaking down too much
> rather than about the diameter,
Why?
Industrial extruders subject the polymer to FAR more shear.
Time in the melt zone is about the same for both.
by
greenman100
-
General
jamesdanielv Wrote:
-------------------------------------------------------
> no according to them 'Filastruder gets +/-0.05mm.'
> who is to say it will work that good for someone
> that has never made feedstock before.
Independently confirmed by dozens of beta testers and users, none of which had ever made feedstock before...
by
greenman100
-
General
isonoob Wrote:
-------------------------------------------------------
> the only issue I see so far with DIY at home
> filament extruders are insconsistent filament
> diameters
Well, you'd be wrong. Filastruder gets +/-0.05mm.
by
greenman100
-
General
coolplastic Wrote:
-------------------------------------------------------
> I think the extrusion bot uses a small
> constriction before pushing the plastic into the
> melt chamber. That constriction acts like a gear
> pump which is used to maintain extrusion quality
> in bigger machines. Giving feedback to the motor
> to adjust speed depending on internal pressures is
> way
by
greenman100
-
Plastic Extruder Working Group
I get about 18"/minute, +/-0.05mm with ABS. Keep in mind there are a number of variables, guaranteeing a speed is not realistic. MFI, nozzle temp, COF, etc.
Gravity will not measurably impact flowrate. It would contribute around 0.1% of the total force.
Why is 36-48"/minute necessary? The Filastruder makes filament faster than my three Solidoodles can use it...
by
greenman100
-
Plastic Extruder Working Group
Ohmarinus Wrote:
-------------------------------------------------------
>
> It's mostly very rewarding to recycle your own
> filament. I have a big box with bags with all
> failed prints and am just waiting until a
> filament-recycler comes out.
Such a beast already exists, you just need Marcus Thymark's shredder and one of these:
They're taking waitlist orders.
by
greenman100
-
Plastic Extruder Working Group
CraigRK Wrote:
-------------------------------------------------------
> Ohmarinus Wrote:
> --------------------------------------------------
> -----
> I am very interested in
> the topic, having just taken delivery of a
> Filastruder and being in UK I would like to find a
> European supplier of pellets.
by
greenman100
-
General
Post this in for sale. General is not the appropriate section.
Also, most of those suppliers have shipping costs that are much less than yours.
by
greenman100
-
For Sale
ugotdan Wrote:
-------------------------------------------------------
> I was looking for something similar recently and
> came across this kickstarter. I think it's
> finished but it may be something to watch for
> later on...
>
> struder-a-robust-inexpensive-filament-extruder
That's mine! We plan to sell after shipping all the backer rewards - just email fil
by
greenman100
-
Mechanics
Why is this urgent?
by
greenman100
-
General
Hi there,
We're fufilling the ~770 Kickstarter rewards right now, but will start taking orders soon! You can email filastruder at gmail dot com to hop on the waitlist - we'll notify you once we're ready.
Thanks!
by
greenman100
-
General
Only one needs to be adjustable, which might simplify things somewhat.
Off the top of my head, I think I'd mount them on a plate together, with a pivot on one end of the plate and a spring loaded screw on the other, like how the bed is mounted on the Solidoodle.
by
greenman100
-
General
That's not how efficiencies are rated.
Power supplies are designed to deliver their rated current. The efficiency comes into play when calculating their draw.
jamesdanielv Wrote:
-------------------------------------------------------
> remember that a 250amp supply is only around 80%
> efficent. so take that 17amps available, and
> figure 3.4amps will be lost to heat!
by
greenman100
-
General
Tim Elmore/elmoret/greenman100 here, the guy behind the Filastruder:
About masterbatch: It's pretty easy. If the instructions call for say, 50:1 ratio, then take 1tsp of masterbatch, mix with 1 cup pellets:
then stir:
Then, spool it up:
and print:
Here's a finished hopper, Filastruder filament.
Printed at 90mm/sec perimeters, 113mm/sec infill. Pretty fast for a Solidoodle.
Hard to
by
greenman100
-
General
Simba Wrote:
-------------------------------------------------------
> Clever designs from Makibot/Solidoodle used a
> thick piece of acrylic to provide the tension
> (Acrylic bends like a canteliver/spring over small
> distances). IT would provide ~5-15 lb of force I
> guess?
>
> Please observe SD2, the top right of this picture
>
> /12/2012-12-10-23.36.22.jpg
>
by
greenman100
-
General