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insta · Post by **insta** » Mon May 11, 2015 2:47 am

jsc wrote:In a similar note, I would suggest you design your giant printer for high-speed printing, with a large nozzle. No point in having a huge build volume if it takes a week to fill it.

Unless, of course, the only other option is a method that takes a month to fill it

(but yes, I agree)

lem · Post by **lem** » Mon May 11, 2015 3:51 am

Uh, 4'x4'x4' is 64 cubic feet. That's 1812278.181888 cubic centimeters. Assuming ABS (1.04 grams per cc) that's about 962 cc per kilogram, gives us approximately 1883 1Kg spools of ABS. Say your print takes up about 15 percent of the volume that would give us somewhere around 282 1Kg spools of ABS for your print.

The final print would be about 600 lbs.

insta · Post by **insta** » Mon May 11, 2015 4:10 am

lem wrote:Uh, 4'x4'x4' is 64 cubic feet. That's 1812278.181888 cubic centimeters. Assuming ABS (1.04 grams per cc) that's about 962 cc per kilogram, gives us approximately 1883 1Kg spools of ABS. Say your print takes up about 15 percent of the volume that would give us somewhere around 282 1Kg spools of ABS for your print.

The final print would be about 600 lbs.

Yeah but nobody is printing a 4x4x4ft cube.

lem · Post by **lem** » Mon May 11, 2015 12:51 pm

Yeah but nobody is printing a 4x4x4ft cube.

No, that's why I chose 15 percent as the actual print volume. The full cube would be about 6x or 6 * 600 = 3600 lbs!

Larry

Jules · Post by **Jules** » Mon May 11, 2015 1:14 pm

Can somebody make me a new car please?

Tim · Post by **Tim** » Mon May 11, 2015 2:05 pm

About the oscilloscope thing: I don't own a Rigol, either, and don't know much about them other than that they look fairly comparable to a Tek scope but cost a heck of a lot less. I go for Tek, HP, and Agilent scopes that I can get off of eBay. I own an HP 54510A sampling scope, which is excellent for most work in "low speed" signaling, which for this scope means up to 250MHz. Since my real job is in RF electronics, I also have a Tek 11801B, which works in the GHz range but is not so great for just looking at logic signals. The color screens on the newer Tek and Rigol scopes are nice to have, but functionality is more critical, and some of the older Tek and HP scopes with a few intuitive knobs are just far easier to use than some of the new ones with a front panel full of buttons.

lem · Post by **lem** » Mon May 11, 2015 6:13 pm

I know Tim is into electronics and such and I was wondering if anyone has used or owns a Rigol oscilloscope? They seem to have good reviews and mich fun to have one to play with.

I missed this.

I have a Rigol MSO1074Z. Scopes I've used in the past are Heathkit (boy am I ancient - scope is 20MHz analog and still works great), and mostly HP. I've only had the Rigol a few months and haven't put much time on it. I mostly use it for microprocessor based projects and lately to analyze problems on the I2C bus. I don't have the automatic I2C analyzer - I find it pretty easy to just look at the clock and data lines.

It's a lot of functionality in a small box. Some people have said that the logic analyzer portion has some problems with bad samples getting into memory, but I haven't used that section of the device yet, so I can't comment on that.

I would classify my use as casual and for me it works just fine. I don't need super accuracy or the fastest thing on the block.

If you have specific questions send me a PM and I'll try to answer them.

Larry

ednisley · Post by **ednisley** » Mon May 11, 2015 8:15 pm

Tim wrote:a few intuitive knobs

Aye! You could drive 'em by touch, completely eyes-off, which counted for a lot.

However, a friend observed that engineers always started with a blank look while trying to find the power switch amid the gazillion buttons & dials on a Tek mainframe scope...
http://www.fastbobs.com/bob/pictures/scopes/7934.html

: Tektronix 7934 Storage Mainframe Oscilloscope; 7934_1.jpg (218.31 KiB) Viewed 13492 times

That is an oscilloscope... [grin]

Tim · Post by **Tim** » Tue May 12, 2015 2:34 am

lem wrote:Say your print takes up about 15 percent of the volume that would give us somewhere around 282 1Kg spools of ABS for your print.

There is an alternative, which was demonstrated on a giant 4' diameter, 10' high delta printer shown at the last World Maker Faire. Instead of spools of filament, you use a barrel full of raw plastic nurdles (the form that most manufacturers use when ordering plastics in massive quantities with economy of scale), and feed them into the extruder through a shop vac hose. I don't know how they kept up the pressure, but I guess a flow of little plastic bits through a hose is enough like a liquid that it will keep up a decent pressure on the nozzle. A side benefit is that you can get full-color printing by controlling the ratio of different colors of nurdles. When I saw the one I mentioned being demonstrated in New York, they had a barrel full of mostly white plastic, with a small percentage of colorant beads thrown in, and was producing a nice solid-color print.

Volcom7114 · Post by **Volcom7114** » Tue May 12, 2015 4:31 am

jimc wrote:Sorry for the img size. Posted from my phone

Jim thanks for the photos! its amazing how close my idea is to that build lol i will have to change a few things maybe so it sets it apart a bit more... Also one of the places Dale gave me can make the bed heater for me no problem and it will run off 120v. Not sure of price yet maybe tomorrow.. thanks much man!

Dennis

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