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Making a Plunger for a Chocolate Syringe

My latest project is a 3D printer that will produce chocolate objects.  Like many other chocolate printers, it will include a syringe to dispense the chocolate.  Unlike those other printers, the syringe in my printer will have 3.5 liter capacity to enable printing large objects.

The syringe is made from PVC pipe using mostly standard fittings.  One piece that wasn’t standard was the plunger that fits inside the syringe tube and pushes on the chocolate contained therein.  I had to design and fabricate the plunger.  PVC pipe isn’t perfectly smooth or perfectly round inside, so I needed something compliant enough to ride out the pipe’s bumps and constrictions while maintaining a seal.  The seal needed to be tough, yet safe for use with food because it will be in contact with the chocolate inside the syringe.  I found some food-grade silicone casting material and ordered it.

While waiting for the silicone to arrive, I designed a 3D printable core for the plunger and a mold and jig.  The core fits on the end of a linear actuator that will provide the push.  The jig centered the core a few mm above the bottom of the mold.  The mold was tapered and the widest part -the bottom- was a few mm larger diameter than the pipe, and several mm larger diameter than the core.  The silicone envelops the core and is locked in place by holes that connect top and bottom side of the core.  The plunger squeeze-fits into the pipe to maintain the seal against the uneven inner surface of the pipe.

Mold, jig, and core for syringe plunger

Making a Plunger for a Chocolate Syringe

Mold, jig, and core for syringe showing core inserted into jig.

 

 

 

 

 

 

 

 

 

Making a Plunger for a Chocolate Syringe

Mold, jig, and core assembled for silicone over-molding.

I measured and mixed the silicone, coated the core with it and then set the core and jig in/on the mold and let it cure for 24 hours.  Then I removed the jig and broke the now silicone covered core out of the mold.  Result: a perfect, tight fit inside the syringe tube.

Making a Plunger for a Chocolate Syringe

Core in mold with silicone.

 

 

 

 

 

 

 

 

 

 

Making a Plunger for a Chocolate Syringe

Finished plunger removed from the mold.  The mold had to be broken off by design.

 

 

 

 

 

 

 

 

 

 

 

Making a Plunger for a Chocolate Syringe

Plunger mounted on linear actuator.

 

 

 

 

 

 

 

 

 

 

 

 

Making a Plunger for a Chocolate Syringe

The assembled syringe.

SHHH: Super Happy Hacker House 36!

What
It has been over 6 months that VHS has moved into its new home on 1715 Cook street, and now that the Vancouver Mini Maker Faire is out of the way, its time for another open house and social night!

Open House (Noon – 5pm)
Never been to a hack space before? Dying to see VHS’ new space? This is the perfect time to visit! VHS members will give you a tour around the space, show off some cool projects, and answer any questions you have.

Many of our members share an interest in 3D printers, laser cutting, machining, crafting, electronics, robotics, programming, electronic music, and art. We welcome enthusiastic amateurs, or anyone with something interesting to share!

A BBQ will available on VHS’ roof patio, so you can bring your own grillables.

Super Happy Hacker House (7:30pm – Late)
Super Happy Hacker House (SHHH) is a social night where members, friends and guests gather for a social night of conversation, adult beverages, lightning talks, and super happy hacker games.

Show and Tell (All day)
Have you made something amazing? Are you in the process of building something that will become amazing? Are you just starting out and want to talk to people about your amazing idea? Come down to VHS and tell us about it. Bring your projects!

Lightning talks – (11PM).

A lightning talk is VHS’ version of an un-conference, where people do short presentation on any subject that they want. Unlike other presentations at conferences, lightning talks last only a few minutes (2 min or less) and friendly heckling is encouraged. Challenge coins will given out to the people doing talks.

A video of some previous lightning talks
https://vancouver.hackspace.ca/wp/2013/10/08/vhs-lightning-talks-video/

Our sponsor has donated beer for the event, which will be available after 7:30pm.

Remember to **BRING YOUR OWN CUP** if you want to drink beverages at the space.

Read a great Georgia Straight article about one of our previous open houses/SHHH!
http://www.straight.com/blogra/499266/photos-vancouver-hack-spaces-fifth-anniversary-open-house

Where
1715 Cook Street, Buzzer #104
Vancouver, BC

Limited street parking is available just outside the space. Bikes can be parked in our loading bay for the night or locked up on the bike racks outside the front door.

This map shows all the parking and amenities around the new space.
https://www.google.com/maps/d/u/0/edit?mid=zQTF2pOfG2Fs.kqmUJ7LBwVZo

When
July 25th (Saturday) from 12:00 Noon till late (2-3 am)

Who
Everyone! Hackers, Makers, Crafters, Kids, Guests, Members, Friends of VHS, Anyone and Everyone.

If you are under the age of majority (19) then you should bring your parent or guardian with you as well. For those of legal drinking age (19), VHS will have donated beer for the adult-only event that will be available after 7:30pm.

Why
Because it is awesome!

 

 

Talk: https://talk.hackspace.ca/t/shhh-super-happy-hacker-house-36/2521

Facebook: https://www.facebook.com/events/1466727176959215

Learn you some Git & GitHub!

What:

Mystified by the ‘Pull Request’ button on GitHub?

Confused by merging, rebasing, committing, pulling, and pushing?

Want to learn a bit more about Git and GitHub?

Come on down! Sean Hagen will be teaching you how to use Git, including some awesome gems that have saved his bacon in the past.

About Git:

Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

Where
The Vancouver Hackspace
1715 #104 Cook street, Vancouver, BC, Canada

When
Wednesday, July 8th, 2015 @ 8pm

Who
Anyone and everyone is welcome. If you are younger than 18 please bring your parent or guardian with you

There will be a $5 workshop fee.
Please RSVP on Picatic

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Pre-order your #CCCamp15 shirts, hoodies, or zippers!

[deutsche Version nach dem Klick]

Sold out T-shirts have a long and sad tradition at CCC events.
We have always tried our best, but we seem to have a tendency to under-estimate the demand.

This is why we are offering a pre-sale for this year’s camp: If you select and pay your garment in advance, we’ll do everything in our power to have it ready and waiting for you to pick up at the camp site.

  • Enjoy the camp with no fear of missing out on your favorite shirt, zipper or hoodie
  • Much shorter queue, no need to juggle cash
  • We’ll avoid the risk of over-producing

Last night, we secretly added an extra garment to the collection:
You were asking for black,
you were asking for zippers,
so we added… black zippers! o/

You can pre-order your favorite garment together with your ticket at tickets.events.ccc.de
If you have already ordered a ticket, please note that you will need to create another account for your merchandise order.

Pre-order your #CCCamp15 shirts, hoodies, or zippers! Pre-order your #CCCamp15 shirts, hoodies, or zippers!

Ausverkaufte T-Shirts haben eine lange, traurige Tradition bei CCC-Veranstaltungen.
Wir haben immer unser Bestes versucht, aber offenbar werden wir unsere Tendenz zur Unterschätzung nicht los.

Darum bieten wir für das diesjährige Camp einen Vorverkauf an: Wenn Du Deine Kleidung im Voraus aussuchst, werden wir alles tun, um sie für Dich fertig zur Abholung im Ziegeleipark bereit zu halten.

  • Genieße das Camp ohne Angst, Dein Shirt, Zipper oder Hoddie nicht zu bekommen
  • Deutlich kürzere Schlange und kein Hantieren mit Bargeld mehr
  • Wir vermeiden Überproduktion

Letzte Nacht haben wir heimlich noch ein weiteres Stück mit in die Kollektion aufgenommen:
Ihr wolltet schwarz,
Ihr wolltet Zipper,
also gibt es jetzt… schwarze Zipper! o/

Du kannst die Klamotten direkt zusammen mit Deinem Ticket ordern: tickets.events.ccc.de
Wenn Du schon ein Ticket bestellt hast, machst Du einfach einen weiteren Account für die zweite Bestellung auf.

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Water at the Camp

As usual, the Chaos Communication Camp takes places in the middle of Nowhere. That means, quite all infrastructure for the needs of thousands of participants has to be carried out to the location.

The Ziegeleipark Mildenberg is connected to the local fresh water and waste water system. But it is not designed for that many people. So we have to store water for showers and taps. And even the waste water needs to be collected, so that it can be dumped in the night, when there is less usage from the villages around. Speaking of toilets: other than during past Camps, there will be no chemical portable toilets with a waste tank. This time we will provide water toilets and urinals! No stinky porta-potties beside your tent, what an advantage! The portable toilets are storage rooms for data communication equipment only, the good old fashioned “Datkenklo”.

We learned from the past years and install more showers than before. There will be shower containers like we had during the last Camp in 2011. Separated shower cabins with heated and enough water for a good shower. But keep in mind, other attendees want to shower as well, so keep your shower time short. We will help you with a button, which will activate the water for a short time only. You can push it endless times, but don’t expect a long, uninterrupted rain on your head.

Furthermore there are three large basins for cleaning your dishes and tools. Please use these locations, as the waste water will be collected for proper removal. You should not empty any waste water on the ground.

Like at the first two Camps in 1999 and 2003 there will be a lake next to the campsite, where you can take a refreshing dip. Please don’t use soap in there – the nature and animals won’t like it.

Water at the Camp

Sparkled and drinking water will be provided by many food and beverage booths at the central market place. There is even an option for buying crates full of water, Mate or beer. If you or your village is interested in buying more than 10 crates, please contact boc@lists.ccc.de for the large order. The pricing will be announced soon.

Kevin’s Cat Wheel Activity Tracker

CRASH member Kevin Jordan is worried about his fat cat.

His fat cat needs more exercise, and like many of us, would greatly benefit from the motivation that comes from a little healthy competition. Unfortunately, we live in a world of tyranny and injustice, and there are no features on the many popular fitness trackers that are cat-friendly.

But like a true maker, Kevin has taken action.

In his own words:

My wheel from OneFastCat needed something. I wanted my cat to be able to compete on Strava with other cats but there was nothing available. Strava is a website and mobile app used to track athletic activity via GPS.

So, I made this system.

It is a breakbeam sensor connected with a Raspberry Pi computer. A fin on the outside of the wheel breaks the path of the sensor. Each rotation is mapped into a GPS location in the real world, moving 3.5 meters per rotation. After 100 seconds of no activity, the Raspberry Pi automatically upload’s to Toonces’ Strava page. The system resets automatically for the next wheel run.

Next up: Figuring a way for Toonces to run on the wheel without interaction from me. He can drive a car, but can’t run on a wheel.

Do you even Strava, cat?

For more information, check out his blog idreamincode!

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Aufgezeichnet: Praktische Einsichten in das Landeshochschulnets BelWü

Etwas her ist es zwar schon, aber nun haben wir neben der einen Hälfte des Vortrags zu selfnet e.V. auch die Aufzeichnung der anderen Hälfte: Tim Kleefass spricht über das Landeshochschulnetz BelWü. Enjoy!

Vortrag BelWue from shack e.V. Hackerspace Stuttgart on Vimeo.

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HackFriday 2015


What is a better holiday activity than a picnic in the park or reading the internet all day at home? Spending the day inside soldering, sewing, programming or laser cutting something great with other nerds! This Friday NYC Resistor is having our third #HackFriday event, an open day for you to come hack on your projects with us. The space will be open from 10am on 3 July and everyone is welcome.

HackFriday 2015HackFriday 2015
If you don’t have a project, don’t worry! You can buy an Arduino from the vending machine or browse through our free parts in “Thingsgiving” to find some inspiration!

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All Officers to the Bridge!

In preparation for our Artemis Simulator that’s going to be at Maker Faire Milwaukee, we’ve partnered with Betty Brinn Children’s Museum to build a realistic starship bridge. Here’s what we’ve got so far.

Starfleet never produced an episode of How It’s Made, so we’re going to have to do a little guessing along the way when building our bridge. Obviously we still need to install the EPS conduits, Tribble-proof everything, and get the self destruct system up and running. But we’ve got nearly 80 days to get it all done.

Don’t forget to bring your phaser to Maker Faire Milwaukee to check out the final build!

Lampe

CNC gefräste Birke-Multiplex-Platte, Reagenzgläser mit Kerzen-Gel + Alu
Glitter, Rückwand Goldfarbene "Rettungsdecke" für PKW

Lampe