Showing posts with label hacking. Show all posts
Showing posts with label hacking. Show all posts

Hacking MachineKit and LinuxCNC to speed up 3d printing with velocity extruding

Bas De Bruijn decided to spped up his 3d printer and made some tweaks in MachineKit and LinuxCNC.

He made following adjustments_
  • Changed the configuration files so that LinuxCNC calculates speed of the extruder based on the nozzle speed (the extruder axis is velocity controlled instead of position controlled).
  • Added functions for setting width of the line being extruded and the height of that line (the current layer).
  • (Un)linking of the extruder with the nozzle velocity.
  • Write scripts that post processes the slicer g-code output (remove all A-axis positions) and insert the dimensions into the g-code.

Here is the video with the results:





From video description:
This is the first output of extruding without the E or A axis. The velocity of the extruder is linked with the velocity of the nozzle.
Width of the line (perimeter/infill) and height of the layer are set from the g-codes, and LinuxCNC calculates the correct cross section to be extruded.
When there is a traverse move (no extrusion) then the velocity is disconnected from the nozzle velocity.

Here is the photo of the results in comparison to normal settings:


"Normal" extruding is on the left and the "pressure adjusted velocity controlled extrusion" is on the right.

























Project homepage with much more detailed information if you want to do it yourself:

http://basdebruijn.com/2014/05/machinekit-and-additive-manufacturing/

All the files can be found at: https://github.com/luminize/machinekit/tree/vel-control-extruding

Bas used this software upgrade to implement 3d printing with guided slew ring wire embedding.

Update (26.9.2014.):

New improvements with velocity extrusion technique and new speed, acceleration and deceleration calculations .

http://basdebruijn.com/2014/09/velocity-extruding-revisited/



R2B2 - 3d printed robot for cracking mobile phone PINs

Robotic Reconfigurable Button Basher (R2B2) is a robot designed to manually brute force PINs or other passwords via manual entry. R2B2 can operate on touch screens or physical buttons. R2B2 can also handle more esoteric lockscreen types such as pattern tracing. R2B2 can crack a stock Android 4 digit PIN exhaustively in 20 hours. Times for other devices vary depending on lockout policies and related defenses.
Built for under $200, using three $10 servomotors, a plastic stylus, an Arduino microcontroller, 3D-printed plastic parts created from a Makerbot 3D printer, and a five dollar webcam that tracks if the bot has successfully guessed the code.

The device can be controlled via USB, connecting to a Mac or Windows PC that runs a simple code-cracking program. The researchers plan to release parts lists, detailed build instructions, and STL files for 3D printed parts at the time of their Def Con talk.

Not all phones are as susceptible to the R2B2's cracking. Apple's iOS, for example, increases the time between PIN attempts after each incorrect guess. But there is only 30 seconds delay after every five wrong guesses in Android phone. At that rate, the robot can still guess five PINs every 35 seconds, or all 10,000 possibilities in 19 hours and 24 minutes, according to Forbes.





It is based on Delta Robot: http://www.thingiverse.com/thing:44235




























Via:

Ultimaker controlled with inbuilt tablet PC

Jarkko Moilanen didn't want to carry PC and printer together so he merged them. He can now control his Ultimaker with old Win 7 Exo PC tablet (UltiController), download models, slice them and listen music, and everything is built in as one unit. Ingenious idea! I can see this as new standard for 3d printers. There is enough cheep tablets floating around. He states that slicing is somewhat slow, but I think it can be solved with some optimization on software side.



Full story and more details on: http://communities.ossoil.com/2361/diy-ulticontroller-mounted-wetab-on-ultimaker/


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