What is the difference between a printer that prints 2…85 vs. 1.75 spools of filament.
What are the advantages / disadvantages?
I know that they both can use about the same size diameter nozzle.
Why choose a printer that prints 2.85 over 1.75?
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2.85 IS STONGER AND STOPS ANY FLEX IN THE BOWDEN TUBE . THIS IN TURN MADE FEEDING THE FILAMENT TO THE EXTRUDER SMOOTHER
So the 2.85 doesn’t print faster or anything the only advantage is want you said above?
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Well both the ultimaker and makerbots or similar run at similar speeds . unless someone else knows different.○
I’m an Ultimaker type of guy with 3 machines and i sell them on our company website. so i trust in 2.85 personally
http://www.fabbaloo.com/blog/2015/7/26/a-curious-thing-about-300-vs-175mm-3d-printer-filament
Thanks from the link! Whats the deal with running 1.75 on a 3.00 machine? I have read in a few you can do this
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Well the same reason as i originally said but worse as the tube has a bigger internal diameter.
i’ve seen prints from other machines (zortrax m200) and they look similar quality to ultimaker.
http://www.mes3dfilaments.co.uk
I am stuck on 2.85/3MM because of my Ultimaker 2 but honestly I feel for more brittle filaments it would be a bit stronger and less likely to snap. Also for flexible the larger diameter would make a HUGE difference in how it feeds out of the printer. That aside I am partial to 3MM because it is what I run but in the end if I got a 1.75MM machine I would use that also… The SEEME CNC Rostock V2’s at my job use 1.75 on a bowden with an E3D V6 hot end and usually a .8MM nozzle with Taulman T-Glaze and they print nicely but due to the long bowden and 1.75 MM filament they run the printers SLOW… now there maybe other contributing factors but I do feel 1.75 mm filament and its overall lack of stiffness could be an issue.
I hear that 1.75 is designed so it doesn’t take as much force to extrude but does require higher speed, hence usually a gear driven setup to combat the loss of torque when speeding a stepper up. While 2.85/3 is designed so it takes more force and less speed being that your shoving more material into the nozzle.
Thank you! That’s quite a large nozzle!
With mine I can use a nozzle down to .2mm, what the smallest you think / have run on your ultimaker?
I am actually upset because of the fact that the 2 different filament diameters exist, I own 2 machines that run 1.75mm filament. and the ONLY reason why I have not yet bought a Ultimaker or a Taz or a sigma is because I don’t want to have to stock 2 different diameters of filament.
To answer your question, I don’t think that there is any huge difference, the only thing that is quite different is the speed at which the material is fed, hence the 3mm filament feeds slower and spends more time sitting in the top side of the hot end so the melting and heatbrake/cooling dynamics are a bit different.
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The printing quality won’t change, as it depends more on the mechanic parts rather than the extusion system (this is also important, but as long as it’s fine tuned, it doesn’t matter if it’s 1.75mm or 3mm).
This is a cyclic debate, and there are no winners, just losers: the customers. As 1.75mm filament is more popular, it may be easier to find online or in your nearest shop. Some companies with good printers, such as TAZ or Ultimaker, which use 3mm filament, are the main responsibles for the 3mm filament not disappearing. However, it’s always possible to transform a printer, I’ve seen people mod an Ultimaker to use 1.75mm filament (with no big quality improvement).
davek
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An extruder uses grip (friction) to force the heated filament through the nozzle (under pressure). For the same nozzle size, a smaller diameter filament requires less pressure. This means that the smaller diameter filament can be fed through faster. Working against that, the larger diameter filament has more volume for the same speed. These two do not cancel each other out however, and generally the smaller filament results in a slightly higher maximum volume through the same size nozzle. So, the maximum speed of 1.75mm filament should be faster than 2.85mm filament. Also, any extruder has a maximum grip on the filament before it slips or the stepper motor is overloaded and skips a step. Because of the lower pressure requirement, 1.75mm is less slippy/skippy than 2.85mm filament - and you can use proportionally smaller nozzles with 1.75mm before the limits of the extruder pressure is reached.
eg: forcing 2.85mm filament through a 0.2mm nozzle is extremely difficult (if you raise the temp then it can burn), but you can do it with 1.75mm filament OK.
I have used both on my printer - I originally had a 3mm J-head with 0.4mm nozzle. Now I have a 1.75mm e3dv6 with 0.4mm nozzle. I can run the 1.75mm nozzle faster. But also I can change the head back to 3mm to use up old filament if I need to. I have drilled out the nozzle on the J-head to 0.8mm so it can run very fast.
It is easier to get good calibration with 1.75mm filament because the measurement is more accurate since the extrusion distance is larger w.r.t the same volume of material and the limit of reading on your ruler/vernier.
Extruders tend to be direct drive with 1.75mm filament (since stepper motors can run at the required speed/torque) whereas extruders for 3mm filament tend to have a gearbox. For Bowden systems that doesn’t matter too much but for non-Bowden systems that can add more weight to the print head and so the printer has to run at a reduced speed to minimize X-Y jerk and X-Y acceleration artefacts in the print.
Bowden systems using 1.75mm tend to have less whip (provided the correct diameter guide is used) because there is less volume of material in the guide.
that’s all well and good but what about the ultimakers olsson block 2.85 filament with 0.25 nozzle as standard with 0.4 , 0.6 , 0.8 nozzles with the printer.
I have 2 ultimaker2’s and they print really well on 0.25mm nozzle without sooting up at high temps.
davek
13
Take the max speed you can run the 2.85mm as standard. Then in comparision the 1.75mm would be able to run faster.
Where are you located? Being in New Zealand myself, my choices are limited to 3mm.
1.75mm filament is available but at 3x the cost of 3mm so it is worth checking availability and pricing in your area. I run 3mm filament on everything.
If you’re going to get a delta printer with a bowden tube then 1.75mm has the edge. 3mm exerts a fair bit of force making it uncoil, which can cause your end effector to flex and move around a little. Since then there has been an upcoming trend to make suspended extruders (also known as floating extruder mod) which work around these downsides. It is almost as good as direct drive on a delta (so in short, fantastic), I’m running that with 3mm filament and it works great!
