Chris Caswell Log

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Time Log


Mar 23 - Mar 29

COVID Response

  • Doorhook.PNG

    Short useful print, "door hook" for opening public doors or around the office.

  • N95 Mask.PNG

    N95 mask, made for combo of 3DP & vacuum form, hopefully a design that can scale


Mar 14 - Mar 20

STEAM CAMP

  • Day 1 D3D build

  • We needed to do some quick drill pressing, but we don't have a drill press at the shop

  • Luckily Scott has one in his mobile workshop!

Mar 9 - Mar 13

  • Printed Spiral linear bearings working on the D3D. Increasing the extrusion width made for a more solid bearing for the z axis

Mar 2 - Mar 8

Feb 24 - Mar 1

  • Internal board org printed as separate pieces, with shell that slides on from the sides

  • Front and back

  • Printed in parts that will fit readily on 6"^3

  • Vaulted back for interior space and to balance well on a surface in portrait or landscape

  • Eco filament experiments: recycled PP & PET from Robries (Surabaya) -> wallet. It will extrude on D3D but bed adhesion issues; heat bed and chamber will be needed, although with perf plate I believe thin wall geometries will be OK.

Feb 10 - Feb 16 2020 --- STEAM camp 1

Jan 25 - Feb 2 2020 --- STEAM camp 1

Next time

  • Better asynchronous communication and coordination, especially for the remote folks, for the collaborative presence to be felt
  • Ideally something embedded in the Wiki, so it will stay on the same platform
  • Embedded IRC?
  • Meeting time to middle of the day
  • Curriculum content (lecture section) better to have posted as video link rather than live stream
  • Need project manager role, someone to focus on coordinating documentation, managing remote folks, checking in on anyone falling behind
  • Printer @1.2mm -> Plotter -> CNC mill toward circuit -> 0.6mm finer prints (printer will get more and more tuned in as the camp goes on)
  • Printing from Useful Print library, which will both produce useful goods showing the value, good calibration prints for the machine, and a good development queue for FreeCAD lessons and practice.
  • PiTab case needs to get to a steady, stable state; simple no frills enclosure. Ideally it will have nut catches or some other attachment point, so next STEAM camp can iterate on some external modules.

RPi Software

Based on the NOOBS install: https://www.raspberrypi.org/downloads/noobs/

Used the offline installer package on a FAT formatted 32gb micro SD

Cura

I had issues trying to run Cura on the Raspbian, it kept crashing. It seems like someone has compiled a version and posted it in the ultimaker forums that will run on the RPi processor: https://community.ultimaker.com/topic/28746-experimental-cura-build-for-raspberry-pi-4-now-available/

Downloads: https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0

Install procedure: Once the appimage file is downloaded (I used Cura-mb-master-armhf-20191209.AppImage), make the file executable
> chmod +x Cura-mb-master-armhf-20191209.AppImage

Then you just need to run the app image file:
> ./Cura-mb-master-armhf-20191209.AppImage

Camera

From https://projects.raspberrypi.org/en/projects/getting-started-with-picamera/3

Once it's plugged in, Camera just needs to be toggled on in the config -> "interfaces"

Once restarted, you can take a picture like this:
> raspistill -o Desktop/image.jpg

This will activate the camera module and show a view finder, until you hit "Enter" and it saves a picture to the specified location.

Photo updates, newest first

  • best keyboard yet for raspbian -- sudo apt-get install florence

  • plotting of the arduino circuit from Pieter log -- following along with Belgium

  • Experimenting with CAM path toolbench in FreeCAD for routing

  • Manually adding the gcode command for "auto level" G29 in the gcode created by inkscape

  • Good gcode visualizer: https://ncviewer.com/ - seems to struggle with big 3d print gcodes, but very quick and easy with the plotting and routing experiments, runs in the browser and just drag and drop gcode file

  • Selfies taken with the rPi camera module!

  • Second selfie

  • Found a version of Cura that runs on ARMHF processor details below

  • Loading up NOOBS Raspbian, offline install

  • some proof of concept routing - I wasn't able to power the motor from RAMPS without it drawing too much current and shutting off. Powered instead by an external power supply. For gcode I just used the same inkscape toolpath for a proof of concept

  • successful plotting! - currently it's plotting a mirror image... interesting

  • Router Toolhead for D3D, for 555 motor -File:RouterToolhead.FCStd - Fit is close on our D3D with standard settings - not sure if the motor needs to be more secure

  • D3D using 54 watts while printing - peaks around 81 watts when first heating up

  • Xiong's Screw Driver - File:ScrewDriver.FCStd - File:ScrewDriver.stl - fits standard 1/4" screwdriver bits

  • Spiral linear bearing - uploaded openscad code, stl is too big. unzip and compile -File:SpiralLinearBearing.zip - One full set has been printed and is installed on a D3D here to be tested

Thur Dec 9 - 13, 2019

I'm working on replicating the D3D Simple build we worked on in November, recreating it here alongside Marcin's recent changes.


  • Cc d3d update 12dec2019.png

  • Trying a different arrangement, for the extruder cables to reach the board

Thur Nov 21, 2019

HintLightbulb.png Hint: How to sharpen to a fine point? -MJ

Putty knife: https://www.amazon.com/Unime-Stainless-Scraper-Drywall-Flexible/dp/B075DS1G61/ref=pd_rhf_ee_p_img_8?_encoding=UTF8&psc=1&refRID=R6EY5V8WYPSTDPAR2NSM

I have used a belt sander to keep a good sharp bevel

Mon Nov 19, 2019

  • Ose wallet.png
  • OSE wallet File:Ose wallet.zip
  • OpenSCAD-ready vector version of the logo - get File:ose_logo_for_openscad.svg
  • Iframe of svg, since SVG is not appearing:

Mon Nov 18, 2019

Nov 14

Nov 1 - Nov 7

Work on Simple Extruder -- Cut/drill/tapped aluminum heat sink block. FreeCADed a jig for alignment (also WIP) - I think the same could be done with heater block.

I bought packs of all the hardware for the universal axis build hoping that I could use the same screws for this - but I am not sure this will be possible.

Spring tensioner needs still most work, the bearing from that is pictured is obviously not going to work...

I have come around to horizontal tool mount; I do feel like it will be more compact and stable. I think could be as simple as 3 holes and wing nuts.. focusing on full functioning of simple extruder first.

Edit: Nov 8 -- updated version of spring tensioner and extruder motor bracket

Oct 25 - Oct 31

After pulling many a hair out trying to make modifications to existing carriage file (every version I could find), have given up and began to just re-CAD from scratch. As proof of concept, made universal tool mount mods to carriage in Blender, but as a back-up I'm doing a super simplified mechanism as well in FreeCAD.

For Simple Extruder, I also started from scratch to build a replacement for the extruder spring base bracket that will also include wire org for the quick attach wiring, and a place for the toolhead mount. This should work for vertical or horizontal mounting, whatever we decide. . Also got trip details planned and tickets purchased for Nov 8 - 23


Oct 20 - Oct 24

Working on Simple Extruder and Universal Toolhead Mount. Note also that D3D_Simple#Part_Library has more.

Tue Oct 9, 2019

edit

Sat Sep 14, 2019

First Conversation with Marcin

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