Open Source Hardware: from Fibers to Fabric

https://www.emiliapucci.com/week-8-circular-open-source-fashion

INSPIRATION


When we assisted to the class Open Source Hardware: from Fibers to Fabric, we had no doubts on what arouse our enthusiasm irremediably: the Circular Knitic. It is elegant, not exceedingly complicated and properly documented, plus the teachers of the class - Mar & Varvara, were the makers so it would be easy in case of troubleshooting. I have never made a machine before and this was a great challenge especially with the support of the fashion design and the engineering students at Fablab Yucatan.

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OBJECTIVES & PLAN


Our Objectives were the following: to reproduce the Circular Knitic adding a few functionalities to hack it :)

HACKS

PLAN

Because of tight deadline and the presence of weddings, boyfriend visits and a Mexican National Holiday - La Revolucion Mexicana del 20 Noviembre, we decided to engage a broader team and divide tasks in the following order:

  1. Read the tutorial material - as quickly and thoroughly as possible to change pieces in case of need
  2. 3D printing - Some pieces require up to 15 hours, so with the collaboration of Jesus we started that ASAP on Tuesday
  3. Material sourcing - a lot of screws, nuts, bolts, needles and other materials are needed for the Circular Knitic, so we made a list and a city hunt plan
  4. Building the Electronics - not too complicated but need to ensure all works
  5. Building the wood base - a bit labor intensive so needed in time
  6. Laser cutting - least labor intensive process and we needed the acrylic
  7. Assembling - once all the pieces were available :)

We used the documentation material coming from the following sources:

Instructables is good to read the instructions and ge a basic idea of how it works

GitHub has all the files you need and links to find other resources

Issuu has a very thorough technical guide on how to assemble which pieces

SOURCING THE MATERIAL


Once we read the Instructable, we found a BOM on Github. What we discovered is that the item list was not as precise as we needed. Ideally we should have a BOM updated for each country that makes the Circular Knitic.

The list on Issuu is much more specific and helpful than the BOM on Instructables. Use that one :)

Now that the list was found, the challenge (el reto) was to translate it to Spanish, and more specifically, to technical Mexican requirements. Technicalese is specific in every country, and I drew a VISUAL LIST with all the different screws, nuts and bolts that we needed in order to put everything together.

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Then we went around Merida to find all the different pieces. Ordering online might not have enabled a quick enough arrival so we made a list of places (check the map) and went around on our mission.

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(For all the people buying screws in Merida: PTB is the ONLY place that will sell M3 screws and nuts!!)

RESULT

M2 screws and nuts

Are pretty impossible to find, so we are changing the size (Mexico has a mixed bag of screws between milimetric and standard and they don’t work well with M2

Makerbeams

We can only order these online or find alternatives at the Fablab (3D printing them, using something different..)

Local stores don’t have anything comparable that we can use or that will arrive before 4 weeks from now.

Knitting Needles XKN8

After going to 4 different places and finding absolutely NOTHING of the sort - Merida doesn't deal in knitting needles, period - we checked on Ebay and found the saddening truth: the needles are out of production 0_0

Bearings

We cannot find the 5 x 10 x 4 mm, only 5 x 11 x 5 mm, so we will either sand or reprint the pieces that have to go with them.

{Images here}

3D PRINTING THE PARTS


With the help of our saviour Jesus, a mecatronic engineering student interning at Fablab Yucatan, we immediately started printing the pieced of the Circular Knitic.

3D PRINTER - Proyectil FDM 20

SLICER - Repetier

MATERIAL - Colored ABS

SIZES - Varied

TIMING - varied between 2 hours and 15 hours

TEMPERATURES - nozzle 195, glass bed 65

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Here are the pieces that were printed on Friday. We still have a lot to go but so far it's been a pretty smooth process with a few hiccups given by changes in humidity, which jammed on of the 2 3D printers.

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BUILDING THE ELECTRONICS


As we were 3D printing and sourcing the material, once again thanks to the multitalented Jesus, we started putting together the electronics of the Circular Knitic.

MATERIALS

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PROCESS

  1. Removed the stepper motor from the CNC router at Fablab, to speed up process
  2. Sourced a Stepper motor driver from Somey at their premises in Merida
  3. Programmed the DCCduino Arduino Uno R3 to make the stepper motor move
  4. Attached power supply and verified it works
  5. Designed circuit board for the Electronics to fit elegantly inside
  6. Still need to print the circuit board and attach the ventilator

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The diagrams and circuit board design are the product of Jesus' work, as well as the electronics assembling. I am learning from him :)

BUILDING THE WOODEN BASE


For this part, I worked with Alex a physicist and the Fablab's expert in woodworking.

MATERIALS

Metallic angles - from

“Hospa” screws - from there is no such thing as a hospa needle in Mexico, so we got something different which ended up being a bad idea

Drywall screws 8 x 1 ''

Wood - from scrap material at the Fablab

Power Drill

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PROCESS

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THE MISSING NEEDLES: EXPLORING SOLUTIONS


As mentioned in the Objectives and Process, the needles required in the original tutorial are not produced anymore by the UK based factory :(

I guess we should have listened better during the class, but I believe we got so excited about it that that information was not registered in our brains.

There was no store in Merida selling these needles, but unfortunately more than one told us yes when we called and then the yes ended up being a misunderstanding. Only one store called Brito told us a client had an order a long time ago that is buried in their warehouse, and they promised they will look for it.

As discussed with Varvara on the Instructable comment thread, it's a good occasion to reconfigure the tutorial with different needles. Currently I'm exploring the following possibilities:

LASER CUTTING THE TOP + ROTATING PIECES


We haven't done it yet since we were waiting for the acrylic to come and then decided that we are going to change the design of the control panel to fit the extra functionalities.

REFLECTIONS & NEXT STEPS


THE BAD NEWS - The needles are not available anymore, and we could have paid more attention to discover this on time.

THE GOOD NEWS - We now have in-depth knowledge of the material providers ecosystem and can out together a Made in Merida Circular Knitic.

THE COOL NEWS - We might be going to adjust the machine to make it work with different needles

Check a WIP video of this adventure here :)