Speed and material properties
So, I get that speed is the new addictive drug in the 3D printing world. But.....what about the physical properties? Some of us push things like PLA, PETG and PC pretty close to it's limits on tensile and shear strength. We certainly do making prosthetics and occasionally have to fix a failure. But I also have seen hard test numbers from two professional materials testing labs (nothing against the YouTube channels but their methods are not quite at the same level) that did studies and found that the peak properties for PETG and PLA were at max temps at 46 mm/sec. As speed increased or decreased shear, tensile and layer bonds decreased and it didn't take long before it hit numbers that mattered to me! They tested as low as 10mm/sec and as high as 120mm/sec on printers more than capable of printing even faster.
So the question is with all the hype and the race for these higher speeds is this issue being considered or addressed? Granted most people only care about cosmetics and the finished part not just falling apart but there is a segment out here that it matters a lot to! Has anyone seen real, materials testing of the speed issue? Are these properties that newer extruders are somehow overcoming?
The reason I wonder is I question is it worth upgrading our two MK3S+ printers with Nextruders for increased output if the material properties are going to drop. In that case, I can just keep the old faithfuls running as they are. In this world opinions don't so much matter as tested results!
RE: Speed and material properties
Stefan from cnc kitchen did a video on this recently on YouTube. He found that part strength was adversely effected. I’m on mobile at the moment so finding the link is difficult.
RE: Speed and material properties
Yes, I've seen his video thanks! It was just another confirmation. I just wonder with all the speed hooplah if anyone on the engineering and design side is trying to find a solution or are we just hitting a wall. That's fine if that's the case but I wonder because so far for what we do I'm not seeing the benefit to the speed!
Stefan from cnc kitchen did a video on this recently on YouTube. He found that part strength was adversely effected. I’m on mobile at the moment so finding the link is difficult.
RE: Speed and material properties
The reason I wonder is I question is it worth upgrading our two MK3S+ printers with Nextruders for increased output
That shouldn't be the reason. At least for me, I do it so I don't need to worry about live Z anymore. In my case that's a real benefit because I change nozzle sizes all the time. I just wish the nextruder had a design that allowed single handed nozzle swaps a la Dragon.
RE: Speed and material properties
When you say "the peak properties for PETG and PLA were at max temps", are you speaking of the max temp typically printed on the spool (which I assume may vary from manufacturer to manufacturer), or some generally accepted maximum for the specific material?
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RE: Speed and material properties
Not really a problem for me as I don't change nozzles except if one is worn out. Since only one printer isn't a vanadium nozzle that's not very often!
The reason I wonder is I question is it worth upgrading our two MK3S+ printers with Nextruders for increased output
That shouldn't be the reason. At least for me, I do it so I don't need to worry about live Z anymore. In my case that's a real benefit because I change nozzle sizes all the time. I just wish the nextruder had a design that allowed single handed nozzle swaps a la Dragon.
RE: Speed and material properties
Yes, maximum temps per manufacturer spec. Because different companies have different formulations it will vary some. But we stay with only a few brands for consistency we have that well figured out. One brand/color for most of what we do. One for a carbon fiber product if additional stiffness is needed. One for PC CF occasionally.
When you say "the peak properties for PETG and PLA were at max temps", are you speaking of the max temp typically printed on the spool (which I assume may vary from manufacturer to manufacturer), or some generally accepted maximum for the specific material?