Cherry picked Planet Reprap - A RepRap blog aggregator

April 30, 2017

New reprap images on Photobucket

Thingiverse - Newest Things

Gutter Stop


A gutter stop, to stop water from falling out the side of your gutter.

by jeroentrappers at April 30, 2017 12:50 PM

Twinstar Motor + ESC Cover with air intake


Put this cover on the motors of your Twinstar. Good cooling, nice optics. Enjoy !

by drnut at April 30, 2017 12:48 PM

Thingiverse - Newest Derivatives

Prusa i3 MK2 - frame damper


Just little addition to great anti-vibration feet from NSGrimace. I like his design but I wanted some frame support also, so I made this very simple supports to dampen the frame.

by ArnieX at April 30, 2017 11:04 AM

April 29, 2017

Digitalw00t

Buildlog.Net Blog

X-Controller-Controller (X-Controller minus controller)

MakeMag_0527

I am very happy with the X-Controller.  It packs everything you need to run Grbl into a clean little package.  It is super easy to hook up and move between machines. With that said, I had a quite a bit different idea in mind when I began the design.

The X-Controller was designed to be the motion controller for the X-Carve. The “X” in X-Carve was meant to signify that it was sold through a configurator and there were a lot of options. The X-controller was going to follow the same concept. It would support Grbl, Beaglebone Machinekit, Smoothy, and others. Additionally, alternate stepper driver PCBs might be developed.

To enable the configurability, the stepper driver section would be separated from the controller section. Every feature the stepper drivers supported would be available to the controller. The plug in controller PCB would control the features via firmware or jumpers and pots, depending on the power of the controller. The current X-controller has 4 stepper drivers, but (2) are wired together. In the split concept the controller card would decide how that was done.

At the time Easel was starting to get some real traction and Easel only supports the Grbl protocol. We decided that it was best to pick the easiest solution for our customers and make the X-Controller Grbl only.

My experiments in Beaglebone and PSoC have been such tangled messes of wires. I always wished I had that disconnected stepper PCB. I finally decided to make one.

xcc1

The XCC Stepper Driver PCB uses the same Toshiba TB6600 drivers as the X-Controller. It fits in the X-controller just like a stock PCB, but it is quite a bit shorter.  The interface side of the PCB has (1) 2×5 right angle header connector for each axis. Brought out the the connector are…

  • Step
  • Direction
  • Torque  (high=full current, low=1/3 current)
  • Enable
  • Micro-stepping selection
  • VRef (sets the motor current)
  • Ground and VMot

xcc2

 

For this version, I put a current selection pot and micro step selection jumpers for each axis to simply testing.  These function should be on the controller board, so most of these will be built without those installed.   The PCB also needs 12VDC to 40VDC power for the motors.  Each driver has a small 5VDC supply built in, so an external source is not needed.

xcc3

Here is a snapshot of the schematic.  This is just 1 of the 4 identical sections.

 

schem

Here is snapshot of the layout. I was able to get everything on 2 layers.

layout

 

It fits into the X-Controller great.  I used a small piece of black acrylic to fit the gap due to the shorter length.  It is working perfectly.  I have been testing it with my PSoC port manually wired in.  A PSoC5 controller will probably be the first controller card I will have made.

xcc4

xcc5

 

 

 

by bdring at April 29, 2017 05:12 PM

RepStrap.dk

Bolt the Thirde

In the mail today, a package from the UK - not subjected to import tax just yet - containing my third hobbed bolt, this one from E3D, so goes well together with my hotend. I expect them to make good stuff, and having it made out of steel rather than brass ought to keep it going a bit longer.

The design is a lot simpler than the Hyena from arcol.hu:


Just plain grooves, nothing particularly fancy. If they prove dissatisfactory, I might go for that place that sells a hardened steel Hyena.

First simple extrude test took 80mm filament when asked to extrude 50mm. But oh! Did it do it beautifully:

Nice and precise extrusion
This matches nicely with the fudge factor of 50/78 I had put in Marlin. Removing that, and the extrusion of 50mm extracts... 94mm? Let's try that again. Yes, quite accurately that much. Ah, but I was looking at the wrong copy of the Marlin sources. Why do we even have that lever? The right one had 41/50 correction factor. Changing that to 50/96 clearly slows down extrusion, and brings us to - extruding 2x50mm for extra accuracy - as close to perfect as I'm able to measure.

Time for, of course, a calibration cube! Today's Z offset is 0.5mm at an indoor temperature of 20C, outdoor humitidy of 96%,  and pressure of 1008hPa. Clearly I need to hook up my little Grove humidity sensor so I can get a usable humidity reading. According to that, I have 25% humidity and 22C. Now I should set that up so that I can just have it running at all times and store the results - for science! Or something.

The cube came out really nice, fewer gaps at the top than usual and nice even walls. I'm liking the bolt so far.


Had to do another Benchy, of course, building up the fleet. This one was even nicer, the writing on the bottom partly legible, fewer gaps in the foredeck, though still some unevenness around the middle of the side.





The first thing to get printed has to be the further Settlers of Catan pieces, this time the Egyptians. It's a new day, calibration is still at 0.5mm Z offset at 25% humidity and 20C. Curiously, when I connected Octoprint (since I think I have the gcode ready there), it centered the X and Y axes reeeally slowly. Looks like the G0 comment uses the wrong speed. But eventually it came up and I was right indeed.
Pyramids and sphinxes and sand-covered roads, oh my

The problem I have with Octoprint is that it has no way to adjust Z offset, so I have to have the GCode contain the Z offset, which is not handy. Getting my prober up and running would be better, unfortunately the prober mount design I found doesn't work with Sturdy Mendel90.

Before delving into modifying a prober STL, I took a look at doing a simple adapter for the dog basket mount I have on my bike. Required a bent tube module, which was easy to find. Also requires a proper way to slice, so I installed the Slic3r plugin. Wasn't too difficult, but for some reason the STL file uploaded doesn't allow slicing - the icon is disabled. No obvious error messages, but Octoprint has started to behave oddly, loading very slowly and sometimes not connecting. Re-uploading the STL after having installed the Slic3r module and enabled it didn't help. The other computers can't run Pronterface without a printer attached enough to actually slice.

by Lars Clausen (noreply@blogger.com) at April 29, 2017 04:02 PM

Public RSS-Feed of Whosa whatsis. Created with the PIXELMECHANICS 'GPlusRSS-Webtool' at http://gplusrss.com

Reshared post from Joan Horvath:

Original Post from Joan Horvath:

We've posted module 1 of our (+Whosa whatsis and my) Hacker Calculus project - a little Circuit Playground based device you can make to visualize acceleration. Details on the device:
https://hackaday.io/project/20621-hacker-calculus/log/58363-log-1-visualizing-acceleration

Please like and follow our project(Hackaday account required) at https://hackaday.io/project/20621-hacker-calculus

April 29, 2017 12:25 AM