Have you seen how fast printers with stepper motors can get? They print benchies in less than 3 minutes. The bottleneck is not the motion system, it's either the hot-end or the part cooling. Also stepper are super accurate and very flexible. Drivers are advanced and can tune for torque, speed, sound etc. Collision detection and skipped step detection is also a thing.
this post was submitted on 10 Jan 2024
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Not disputing, I want that 3 minute benchy. Where does one find this magic?
The print as absolute shit though. Literal garbage.
Looks pretty good for the speed to me! This is an experiment. Someone will be able to build on that and make it better.
https://youtu.be/f5OHYZbrHjs?si=LruE_T63UnlSRWa0
This is as fast as I've seen for PLA while still retaining good quality. And he probably could go faster with more powerful motors or more of them.
Honestly, there’s going to be a hard peak to how fast a 3D printer can go, because physics. Unless we start running prints in a vacuum and start tuning local gravity….
There will always be limits to how fast you can go. But as long as the average printer is not even close to whats doable there is room for improvement.
That’s much much nicer. I’ve been looking at the bamboo x1c, its speed and quality is pretty amazing right out the box.
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Speed Benchys mostly are garbage quality.
This is mostly a cooling issue. Not being able to solidify the plastic fast enough after it's been deposited.
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Yeah does anyone have a link to a 3 min bench print?
3 minute benchy
It's custom made printers and it makes shitty prints.
https://www.youtube.com/watch?v=IRUQBTPgon4
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Stepper motors are considerably easier to lock in a single location than continuous rotation servos. When they are commanded to a certain position they will STAY THERE. This makes precise positioning considerably easier vs a continuous rotation servo, which must use a sensor feedback loop to ensure it stays close to where it needs to be. And any feedback loop will involve small amounts of extremely undesirable oscillation and movement about the target point...
besides. we can already drive steppers significantly faster than any hot end can melt plastic.
Well, that's why you use a proper servo drive. Yes, technically they oscillate at standstill, but it's so little it literally does not matter. Closed loop servo control is a solved problem unless you're trying to implement it yourself.
Yeah the big issues with servos would be that even with very good controllers you'd end up having to constantly bump to the corner 0s just to ensure you got the right location. Stepper motors can be relied upon to hold the position.
Cost is the short version, yes.
I don't know what kind of servos everyone here is talking about that are less precise than open loop steppers. Low quality hobbyist stuff, I guess? Proper servo motors & drives are the standard for good reason for robotics, industrial CNC machines, and pretty much everything else that needs powerful motors with high precision. Much higher power density, higher RPM (good for increasing torque with a gearbox), equivalent or better precision, plus closed loop control is a huge capability and safety gain.
That said, good, industrial quality servo motors are 1) expensive and 2) aren't made in small enough sizes to be comparable to the steppers on most 3D printers. Even the smallest industrial servo + drive I've seen is about 5x as big as the steppers on a personal 3D printer and costs $800ish. Obviously, both are deal breakers for a personal 3D printer.
3D printers are a fairly ideal application for steppers. The moving parts are small and light, meaning you both don't need a large motor and the danger of slippage is lower. Plus, steppers are cheap.
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