3-d printing help, please? - Science Spooktacular!

[Diane Sudduth]

The St. Louis Science Center is hosting Science Spooktacular on Thursday, October 27, from 5pm to 8pm.     Arch Reactor has agreed to participate in this event.   We've been asked to bring the 3D printer to print Halloween-Themed items and to have whomever works the event appear in costume (no masks, please)

In preparation for this event I've downloaded and sliced the three pumpkins from This Thingiverse Project which are currently on the Griffin SD card under the Diane subfolder.    My goal is to have about 20 of these printed in time for the Spooktacular.  IF you are going to be in the space for at least an hour and know how to use the Griffin and no one is using the Griffin, would you please be so kind as to load orange filament and run a pumpkin or three?  (one pumpkin takes about 45 minutes, three takes about 100 minutes)     The orange filament is in "my" box (labeled "diane - heavy" on the shelf under and to the right of the 3D printers)     Printed pumpkins can be added back to the box.  

I'll be in periodically over the next couple of weeks printing off pumpkins but I'd appreciate the help! 

(If anyone knows how to add support material to the "mouth" area to improve the look of the upper "teeth" on the pumpkins, that would be awesome!)

I've also got some wooden "carved pumpkins" to give out with the AR Website in lieu of "gears" for the event.

I'll be at the event with the Griffin, the printed pumpkins, the lasered pumpkins, and some candy to give out.   And I'll be dressed in my faire garb (yes, complete with bells)   

Derek will be there with his "popping head" which is cool and creepy!

If you have a fun halloween-themed item and would like to come to the Spooktacular, please comment here!   Currently we have one table but I'm sure the SLSC would happily give us more if we have more folks who want to come thrill kids with some spooky science!  

Thanks!

[Derek Sigler]

I'd like to bring my popping head, but it is powered by the air compressor.  Running the compressor is extremely loud and would not be pleasant indoors.  Probably should think of something else.

[Chris Weiss]

maybe could have it out in Grow?

[Myles Farrell]

How much pressure does it need? and CFM per shot? I have a tank that you could use and then have the compressor in the back room to refill the tank.

On Mon, Oct 17, 2016 at 12:41 PM, Chris Weiss <cwe...@gmail.com> wrote:

maybe could have it out in Grow?

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[Robert Kleeschulte]

Might need to make a little surge tank inline to not use up all the air at once? Think of a small air tank on a air cannon with just enough air to make it pop but not slam into the ceiling.

My schedule is open for the event and can help with the event.

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[Keith Rogers]

Print suggestion - glow in the dark filament and ghost figures

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[Chris Hemmerly]

You could use some sort of compressed gas cylinder for this, like CO2..

[EschewObfuscation]

I too have a tank of this type; it was a gift from a friend, haven't used it myself, so I'm not 100% sure if it holds pressure, but it probably does. Or it might need a replacement valve or something. I'd have the same questions re pressure and amount of air used. With two, you could have one in service, one getting repressurized, then swap. (These are intended to be refilled at gas stations, and to serve as a portable means of inflating a tire.)

[Chris Weiss]

since derek seems to be busy... as I recall the air mechanism is based on a potato gun.  a portable tank should get quite a few launches.

[Derek Sigler]

I don't know the math.  My 6gallon yank @ 150 psi feeds to my 1.5 gallon popper tank at ~40psi.  The trigger is manual and pretty much dumps the popper tank.  My compressor kicks off about every 3 pops. 

Ideally I need to redo it and make it more efficient.  A case of development turning production. :) 

 

[Myles Farrell]

I just did some quick math. Going just on volume if you pressurize my tank to 60 psi it would give you the volume to shoot off 4.7 shots, but that doesn't take pressure into account. My guess is you could get 2 good shots and a weaker third.

On Tue, Oct 18, 2016 at 9:28 AM, 'Derek Sigler' via Arch Reactor <arch-r...@googlegroups.com> wrote:

I don't know the math.  My 6gallon yank @ 150 psi feeds to my 1.5 gallon popper tank at ~40psi.  The trigger is manual and pretty much dumps the popper tank.  My compressor kicks off about every 3 pops. 

Ideally I need to redo it and make it more efficient.  A case of development turning production. :) 

 

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[EschewObfuscation]

Scuba gear regulates down to 90 psi at the output of the first stage regulator. I have one, but it's out of its 5 year hydrotest cycle, and the retail shops gouge for having a real shop do the hydrotest; you could buy an automotive 11 gallon tank for less than they charge (after markeup) for testing an existing tank. If someone had one in cycle, that might feed your 40#? (Shops will refuse to fill a tank if its hydrotest isn't within 5 years.)

[Brad Tissi]

Myles, I'm not so sure that I told you, but the 100# propane tank is in the space for your vacuum project. That may be relevant to this.