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Whosa whatsis
Works at Deezmaker
Attends University of Autodidacticism
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Whosa whatsis

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Maslows_hierarchy[] normally looks like this:

{Physiological needs, Safety needs, Love and belonging, Esteem, Self-actualization}

But some days, it looks like this:

{Coding, Coding, Coding, Coding, Coding}

My guess is that there's a buffer overflow vulnerability that allows it to be overwritten this way.
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Why hasn't anybody made a small motor controller to that uses an encoder and takes step/dir signals in a format compatible with a pololu driver so that we can use servos as drop-in replacements for steppers on printers yet? I would think there should be chips designed to do this, but even if it requires a microcontroller and a separate H-bridge, it shouldn't be difficult...
Jan Kako's profile photoBrad Hopper's profile photoKevin LaSanders's profile photoMike Creuzer's profile photo
A couple of interesting ideas here. Looks more like a CNC mill's toolpath than a printer's. Shallow-angled nozzles need not apply.
Camerin hahn's profile photoScott Leighton's profile photoWes Brown's profile photoNick Parker's profile photo
+paul mplr that's where I've been looking with all this. Arbitrary layer shape should allow you to mitigate layer interface weaknesses in an appropriate way for your application.

Also, for ninjaflex and similar, you could manipulate flexibility with layer shape.
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Whosa whatsis

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Something like this might make a good Z probe, able to detect an aluminum heat spreader on the platform.
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Whosa whatsis

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We've been printing a lot of these for giveaways at the shop. A set of 6 prints in 1.5 hours on a Bukito, and we usually have a couple of them running to maintain our supply (also a good way to keep them active as demo units). One of these, days, I'll get around to posting the files...
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Have him in circles
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Whosa whatsis

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I still want to see patents abolished, but this is the next best thing.
Billy Zelsnack's profile photoCamerin hahn's profile photojl roberts's profile photoStephen Baird's profile photo
+Billy Zelsnack where does the money to pay for the lawyers come from... the sale price of the products. lawyers dont work for free...
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Oh, tiny microcontroller dev boards that I already have too many of and will probably never get around to using, I wish I knew how to quit you.
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I got "onboard" this one also.
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Whosa whatsis

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The skanbot fits in my tiny car without disassembly, and it will fit even more easily once I get the new, more compact turntable mechanism working. This one is from an old project and is bigger than it needs to be.
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Another printer resulting from the race to the bottom.

I saw early shots of this that looked like it was an H-bot, but this one appears to have a rack-and-pinion X axis. Y has loops of belt that I'm guessing are driven by spinning the four Z-axis smooth rods, which would in run need to be D-shaped or have slots milled in them to allow pulleys to turn with them while still sliding vertically, similar to this concept for an off-carriage extruder motor:

Of course, for the pulleys to be loose enough to slide freely, I suspect that a bit of backlash in these pulleys will be impossible to avoid.
Andreas Thorn's profile photolinco matic's profile photoArthur Wolf's profile photoJohn Driggers's profile photo
They claim to have their own custom idiot proof software. Yet, their video shows Pronterface running in at least 2 shots
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Whosa whatsis

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These results are surprisingly dramatic. From the picture, I suspect that the knurled drive used by the +Ultimaker is part of the problem. I should set up a similar test with one of our Tatsu drive gears.
As I've experimented with different print styles and slicers, and especially as I've  been helping new users who are wrestling with printers that seem utterly unwilling to cooperate, I've become mo...
Camerin hahn's profile photoAshley Webster's profile photoTom Øyvind Hogstad's profile photoDale Dunn's profile photo
These results aren't that surprising to me. The fact that the drive wheel of any design is leaving permanent marks on the filament means that the filament is being permanently deformed by the forces applied by the impinging tooth of the drive wheel. A drive wheel that is turning will apply some of its force, and therefore some of the deformation along the length of the filament. And the more force applied along the length, the greater the deformation along the length. So, there will always be some amount of extruder "slip", proportional to the back pressure in the nozzle.

What this means is that the effective extruder steps per mm will be different for each extrusion condition (a combination of speed and layer height). We calibrate e-steps per mm extruding into air at some arbitrary rate, then apply an "extrusion multiplier" fudge factor to correct the extrusion rate on an actual test print.

So, until we start measuring filament diameter and speed going into the drive, we will need different calibrations for different speeds and layer heights. Or, we could find a way to drive the filament in a way that doesn't significantly deform the filament or any part of the drive mechanism at the same time that it's pushing the filament. The only real difference between drive wheels in use now is how much slip can be tolerated before they strip the filament entirely.

This suggests to me the idea to have have two "drive" wheels in the extruder. One undriven to imprint the filament with a grippable shape and the second one driven to feed the filament without applying additional lengthwise deformation. I don't know if sufficient drive force to extrude at speed can be applied without inducing significant lengthwise distortion, if that speed would be an improvement over what we're doing now.

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Have him in circles
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  • Deezmaker
    2012 - present
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Polymathic autodidact
On a good day, I'm an iconoclastic, autodidactic polymath. The rest of the time I'm just a cynical, dilettantish tinkerer.

Also, I make stuff.
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Whosa whatsis's +1's are the things they like, agree with, or want to recommend.
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