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Duet is the Arduino Due Compatible RepRap Electronics
Re: Hugh Lyman won the Desktop Factory Competition - 11 years ago
Correct, flow rate is roughly proportional to deltaP across the die, but in my experiments I'm seeing somewhere between a quadratic and cubic relationship. Not sure if there's other factors at play, like turbulence or varying motor/gearbox efficiencies in my admittedly limited sample size of motors (~ 6 different types). Even if the relationship is quadratic, you're looking at something like 100by greenman100 - General
Re: Hugh Lyman won the Desktop Factory Competition - 11 years ago
This seems quite possible. I have some .4mm - 1.0mm drill bits, so I'll give it a shot. Tim VDX Wrote: ------------------------------------------------------- > ... if you can make even thinner filament - 0.3 to > 0.1mm thick wires would be perfect ... can be +/- > 0.05 off too without problems ... > > I'm developing an alternative FFF methode, that > uses thin wires directby greenman100 - General
Re: Hugh Lyman won the Desktop Factory Competition - 11 years ago
PomeroyB Wrote: ------------------------------------------------------- > What's the fastest speed anyone's been able to run > these at reliably? 1 foot per minute is still > pretty darned slow... The issue is that motor power scales with the cube of the linear extrusion speed, roughly speaking. Going faster would require a much pricier and much larger motor. I cannot print as fast asby greenman100 - General
Re: Hugh Lyman won the Desktop Factory Competition - 11 years ago
I haven't tested a 3mm die personally, but changing the die might be all that's necessary. It's possible I'll also need to spec out a faster motor. I'll try to test one this week and let you know. akhlut Wrote: ------------------------------------------------------- > greenman, > > That looks like quite a good setup. > > When are you bringing a 3mm to market? You're out > oby greenman100 - General
Re: Hugh Lyman won the Desktop Factory Competition - 11 years ago
akhlut Wrote: ------------------------------------------------------- > greenman, > > That's pretty good. What tolerance and variance > data do you have? And do you have a 3mm die? I've measured ~50 times over the course of a kg of extrusion, and I see +/- 0.03 90% of the time, with a few +/-0.07. I can upload each individual measurement later this week, or even send you a sampleby greenman100 - General
Re: Hugh Lyman won the Desktop Factory Competition - 11 years ago
Not sure about Lyman's, but with the Filastruder I use 50w, and it takes 16 hours to do 1 kg. That's 0.8kwh, or about 10 cents of electricty where I live. Plenty cheap. akhlut Wrote: ------------------------------------------------------- > Or power consumption. At 8 IPM > > Let's assume that 36" of 3mm ABS filament weighs > 6g (according to my scale). So 1lb of filament is &gby greenman100 - General
Re: Hugh Lyman won the Desktop Factory Competition - 11 years ago
I get 12"/minute with the Filastruder, I can do 1kg letting it run overnight. PomeroyB Wrote: ------------------------------------------------------- > Also the speed involved. 8 inches per minute? That > would take forever to go through a batch of > pellets. It would take just as long to make the > filament as it would to print anything with it!by greenman100 - General
Re: ATX power supply and Sanguinololu controller - 11 years ago
Use a smaller bed heater, say one rated at 10A, and you'll have plenty of overhead.by greenman100 - General
Re: Filament Extruder - Convert pellets to filament - 11 years ago
He's not counting shipping, which is ~$15/kg from China. waitaki Wrote: ------------------------------------------------------- > A kilo of filament for $15 or less? Care to tell > me where to buy it?by greenman100 - General
Re: Filament Extruder - Convert pellets to filament - 11 years ago
I can get ABS pellets for $2.50/lb shipped to my door, quantites of 10lbs at a time. Why wait for hyopthetical pricing to come down? If you use even 15 lbs of filament over the course of your RepRap's life, an extruder has paid for itself. WICK12345 Wrote: ------------------------------------------------------- > Is this really needed? The cost of the supplies > will come down dramatiby greenman100 - General
Re: Best method for sanding/smoothing PLA jewelry - 11 years ago
Use ABS, then acetone vapor with a crockpot.by greenman100 - General
Re: QU-BD Revolution XL Speed Test 9000mm/s Accel @ 1000mm/s - 11 years ago
bobc Wrote: ------------------------------------------------------- > Therefore if nominal speed was achieved, I would > expect to see a trapezoidal profile, of about 0.11 > sec accel, 0.12 sec at 1000mm/sec then decel to > zero of 0.11 sec. That adds up to about 0.34 sec, > which is a little quicker than observed. There's an error of +/-.09s, since we do not know when between fraby greenman100 - General
Re: QU-BD Revolution XL Speed Test 9000mm/s Accel @ 1000mm/s - 11 years ago
Chelsea - QU-BD Wrote: ------------------------------------------------------- > Also...and I'm going to check with Nathan on this, > since he would know for sure, but if you are > calculating speed by timing the movement over a > given distance, wouldn't that be the average speed > vs. the top speed it achieved during that move? > When I calculate the average speed I get the sby greenman100 - General
Re: Z-Axis Shaft Couplers For Prusa V1 - 11 years ago
Sure, shoot me an email with the file you want. elmoret at gmail.by greenman100 - Wanted
Re: Filament Extruder inconclusiveness. - 12 years ago
Uwe_S Wrote: -------------------------------------------------------. > Without rolls at all it just works if you dont > want to get the produced filament winded on a > spool. This is the reason why I want to try those > rolls. I did not use any rollers on the output, I let it pile on the floor, then spool it up with a drill:by greenman100 - General
Re: On/Off switches for Spooler - 12 years ago
Mechanical endstop switches would work fine. You can get them from mouser - get the lowest actuation force you can. I'd recommend trying just one limit switch, on the droop. I'd make a really long lever for it (print one!) which will reduce the actuation force even further (at the expense of some travel). You don't need an arduino, just wire the switch inline with the motor, as long as the switcby greenman100 - General
Re: MakiBox $200 Complete 3D Printer 
- 12 years ago
Tekwizard Wrote: > Anybody heard any happy customer reviews yet? To my knowledge, they have not shipped a single printer yet.by greenman100 - General
Re: MakiBox $200 Complete 3D Printer - 12 years ago
Robert Eastwood Wrote: ------------------------------------------------------- > What I am curious about, is if it is using > rotating rod, is the snugness of the nut that > moves as the rod turns an issue with precision? It is. Start reading up about backlash, machine screws, leadscrews, ball screws.by greenman100 - General
Re: MakiBox $200 Complete 3D Printer - 12 years ago
Simba Wrote: ----------------- > All filament extruders get well below .1 mm > tolerance - the one on your 3d printer makes .35 > mm with nearly .02 mm accuracy = standard > deviation. Crappy extruders everywhere can hit > .03 made with little control or expertise. This isn't quite true. Apples and oranges comparing a 0.35mm nozzle to a 1.75 or 3.0mm nozzle.by greenman100 - General
Re: MakiBox $200 Complete 3D Printer - 12 years ago
xclusive585 Wrote: ------------------------------------------------------- > I'm more interested in their filament extruder. If > it produces decent filament with accurate widths. > Upon looking over the highschool drawn notebook > plan, I really do not see nearly enough parts to > produce accurately extruded plastic. > > I've been looking around some of the solutions >by greenman100 - General
Re: Filament Extruder inconclusiveness. - 12 years ago
I've made one here: And I've made the whole thing available in kit form. Email me - filastruder@gmail.com.by greenman100 - General
Re: Why are filament spools so expensive compared to pellets? - 12 years ago
I get ABS pellets for about $2.50/lb ($6.00/kg) including shipping. (US dollars)by greenman100 - General
Re: Why are filament spools so expensive compared to pellets? - 12 years ago
I suspect it would work fine with PLA. Unfortunately, I don't have a source for PLA pellets. Do you?by greenman100 - General
Re: Why are filament spools so expensive compared to pellets? - 12 years ago
I've developed an extruder that converts pellets to 1.75mm filament: The basics: $175 total parts cost Tolerance is +/-0.05mm, usually +/-0.02mm Extrudes 0.05kg/hour at 40 watts average power consumptionby greenman100 - General
Re: Filament Extruder - Convert pellets to filament - 12 years ago
Beta testing has begun! Here's the details:by greenman100 - General
Re: Filament Extruder - Convert pellets to filament - 12 years ago
theodleif Wrote: ------------------------------------------------------- > @greenman100: Will you show us pictures of what's > inside the extruder? > > Have you already thought about publishing the > plans of how to build it or at least a BOM? I am > interested in a cheap DIY open source filament > extruder which is easy to make. Soon! I want to finalize the design first.by greenman100 - General
Re: Filament Extruder - Convert pellets to filament - 12 years ago
yydoctt Wrote: ------------------------------------------------------- > If it pans out more like > FilaBot, then you will lose credit very rapidly. > > Good luck! What went wrong with FilaBot?by greenman100 - General
Filament Extruder - Convert pellets to filament - 12 years ago
So, like most people, I've been surprised at how much filament costs, compared to raw plastic. For example, 2kg of Makerbot plastic is $110 shipped, but 1kg of raw ABS is $15 shipped. As some of you probably know, this has been identified by others as a problem too. Desktop Factory has put out an offer of $40,000+ prizes for anyone that comes up with a machine that converts pellets to filament.by greenman100 - General