Profile cover photo
Profile photo
John Bump
5,571 followers -
Mad scientist
Mad scientist

5,571 followers
About
John's interests
View all
John's posts

As I'm having too much fun printing to mess about with troubleshooting, I still haven't gotten a usb connection to the printer running: I'm just running off sdcard. But I'd sure like to write in the different PID tuning parameters for the head. Can I edit the m-code into the first couple lines of a print file and expect it to stick? Presumably M301 P20 I0.02 D250
M500? This would work on my cnc mill but that's a very differently architected system. Thanks for any advice.

Just got one. Pleased so far. I have not yet managed to get repetier-host to talk to the printer, but I can run off sdcard. I'm curious if anyone else is running repetier-host on linux and has suggestions for getting them talking. I am new enough at this that I don't know if r-h or curaengine is where I'd need to make changes. r-h 1.6.2, not actually sure what version of curaengine, have slic3r 1.2.2 but haven't yet used it.

Post has attachment
Avery Brewery has a ceiling fan with a larger span than some small aircraft. Visited yesterday to acquire their brand new apricot beer.
Photo

Post has attachment
Monoprice mini: first print. It works ok. Really fast and smooth motion. Extruder heat control is worse than the worst reviews: so bad the filament solidified and jammed during one print. There are instructions for changing the pid parameters, which is vital. I have not yet because repetier-host on Linux is crashy for me so hey wow it is convenient that the mini prints off SD card. Hot end teardown to unjam was trivial. With just a small amount of design they could have made the hotend a truly nice screw-together design. Driver board needs more airflow. Still, for the price, it is seriously sweet.
Photo
Photo
1/31/17
2 Photos - View album

Project suggestion: hack the login process on a linux or android system so if I enter username and password1 I get my normal filesystem, whereas if I enter the same username but password2, I boot into a nearly blank install with just enough personal data to appear to be used. (On a linux system I could just use an alternate user name, but on an android system the users appear as icons on the login screen.)

Post has shared content
Ion migration in glassy metallics as a result of strain, resulting in weaker, banded structures. Interesting to me because at work we deal a lot with ion migration issues from electrical current flow. Related processes in metallic crystals are pretty well-understood, but glasses are still confusing.
"Over time, when a metallic glass is put under stress, its atoms will shift, slide and ultimately form bands that leave the material more prone to breaking. Rice University scientists have developed new computational methods based on a general theory of glasses to explain why.
A new paper in the Proceedings of the National Academy of Sciences by Rice physicist Peter Wolynes and former graduate student Apiwat Wisitsorasak lays a foundation to calculate how all types of glass morph over time when they are put under mechanical stress. Their formulas could help scientists and manufacturers make glass better for specific applications.
Metallic glasses are alloys that have a glass-like disordered structure rather than the polycrystalline structures of familiar metals. They can be both brittle and ductile to degrees and can be made into complex shapes, like the heads of golf clubs. Unlike window glass, they are conductive and may be useful for electronics.
Outwardly, glass may seem solid, but the random array of molecules inside is always moving, Wolynes said. It has been known for decades that when stressed, glasses will form shear bands, lines that localize the strain. Many ideas have been put forward about how this happens, but now the Rice group can explain the phenomenon using a general theory of how glasses form based on energy landscapes.
Wolynes has continued his long-running study of the molecular properties of glass at Rice's Center for Theoretical Biological Physics (CTBP), where he also develops the physics of energy landscapes for protein and DNA folding. His motivation for the new work was to see if the formation of shear bands could be explained through computations that describe how stress changes the rate of atomic rearrangement in the glass".

Post has shared content

Post has attachment
Artwork and broken antique video game at Scrumptious. The video game has the horizontal sync misbehaving, so the screen drifts sideways during play. If anyone knows anyone in the Denver area who fixes this, let me know.
Photo
Photo
1/15/17
2 Photos - View album

Post has attachment
Reeb fatbike at the Oskar Blues Uncorporate Unheadquarters.
Photo

Post has attachment
Robot utility box in a park in Colorado Springs, surrounded by significant amounts of devastation: they're still recovering from a windstorm that had gusts well over 100mph.
Photo
Wait while more posts are being loaded