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Whosa whatsis
2,653 followers -
Polymathic autodidact
Polymathic autodidact

2,653 followers
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According to this, the problem with grinding materials and re-melting them is that the shear stress from the grinding process makes the plastic unusable, but wouldn't re-melting undo any damage from shear stress? I suppose you might break some polymer chains or something, but I would think that you would have to grind extremely finely for that to be a problem.

After all, isn't most filament (good filament, at least) made by extruding the filament once, then cutting it up (presumably with a shearing cutter of some sort) to turn it back into pellets, to be extruded again? My understanding is that this is standard practice, at least for color filaments, which won't get sufficient mixing in a single extrusion pass. The pellets they show while talking about the shearing problem were clearly made this way...

For anyone else considering using a food dehydrator to dry filament, I just discovered that an overturned 5-gallon bucket fits almost perfectly on top of this one:

https://www.amazon.com/gp/product/B018UR4XJI/
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My version of the "Zippo Bit Safe" idea. This one packs in an entire precision screwdriver set with 12 bits (or 11 plus an extender).

https://www.youmagine.com/designs/zippo-shell-precision-screwdriver-set-58-22

Original by Laura Kampf: https://www.youtube.com/watch?v=zIqTdPbxGBY
Another interesting one: https://www.thingiverse.com/thing:2882547
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4/29/18
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We (+Whosa whatsis and I) have a new 3D printing course out on Lynda.com and LinkedIn Learning on troubleshooting - always a fun topic!
https://www.lynda.com/CAD-tutorials/Additive-Manufacturing-Troubleshoot-3D-Prints/667362-2.html
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After seeing +Walter Hsiao's recent blog posts, I got inspired to do some experiments with taking pictures in a light tent.

http://thrinter.com/photographing-3d-prints-1-overview/
http://thrinter.com/photographing-3d-prints-part-2-equipment/
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4/14/18
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+Walter Hsiao Did his own version of the Cranestyle Mini.

Walter, maybe you can share with us where some of the parts were sourced? I'm particularly interested in the platform heater you used. Also, is that base a single 6-slot extrusion, or is it a couple of smaller ones put together. If it's one, where did you source it? I really wanted to find wider ones (especially for the 150mm-scale Cranestyle less-mini I've started building), but Misumi didn't have them.

Those all-metal bowden fittings also look like an improvement, but I haven't seen those ones with M6 threads.

Speaking of the bowden tube, does one that short actually work? How is the extruder mounted, and how much is it able to move?

I see an endstop switch for the X axis. Is the fan the trigger? There is also something attached to the X motor that I assume is part of the Z endstop trigger. Personally, I removed all of the microswitches from mine, and I use TMC2130 sensorless homing for X and Y and an inductive probe for Z.

Running that hot end umbilical from below the platform looks pretty clean, but I would worry that it would snag on things carrying the machine around. And is it long enough for the machine to reach X min and Z max without the cables encroaching on the build area?

Maybe you can also discuss some of your other design choices.

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I saw this tonight from Pasadena. The sun was just below the horizon and the sky was dark, but the rocket was high enough to be out of the earth's shadow by the time the interesting stuff started happening. It was pretty spectacular.
Elon's sleigh flew past Los Angeles tonight... :-)
(the excitement starts at the 0:54 mark)
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Which slicer do you use on a daily basis, and why do you choose it over the other options? If you use more than one regularly, what makes you decide to use one or the other? There have been polls on the popularity of various slicers, but polls fail to cover the "why" part. I'm looking for reasons to recommend one slicer over another for certain types of jobs, or to certain types of users.

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Put together a little article with +Whosa whatsis about one of our pet peeves: how to define 3d printing "resolution." Check it out at the link:

https://www.linkedin.com/pulse/3d-printer-resolution-myth-reality-joan-horvath

#3dprinting
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My first class with +Whosa whatsis on Lynda.com has just been released, "Additive Manufacturing: Optimizing 3D Prints."

Lynda.com classes are behind a paywall, but they have free trials! Many schools also have subscriptions.

The class on Lynda.com: https://www.lynda.com/CAD-tutorials/Additive-Manufacturing-Optimizing-3D-Prints/618717-2.html

Some of it is also available via LinkedInLearning:
https://www.linkedin.com/learning/additive-manufacturing-optimizing-3d-prints

Check it out!
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