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Printrbot Talk Forum • View topic - Big 3D Printer

Big 3D Printer

Big 3D Printer

Postby keljam7 » 2015-Jan-Fri-15-Jan

I was wondering if any of you guys know where I can get a big 3D printer? And if anyone knows let me know, and how big, what state, country?
And it will need to be for plastics. How big you ask, well I don't know ether. I don't know what sizes are out there.

Thanks in adv.
-kelly
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Re: Big 3D Printer

Postby orangefurball » 2015-Jan-Sat-14-Jan

Kelly, what size objects do you need to print? How many at a time? That would be where I would start in determining s minimum size. "Big" to person A can be different than "big" to person B, it really depends on what you print.
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Re: Big 3D Printer

Postby JonS » 2015-Jan-Sat-15-Jan

I'd suggest trying Texas! :P

Yes, you really need to bound your question. BigRap can print furniture: .

There's a four-meter tall delta printer:

Then if you want to talk about printers for buildings:

Please let us know what you consider to be "big".
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Printrbot Metal Plus with:

- Dual Ubis 13S metal hot ends (swapped for original Ubis metals)
- Dual Gear Head extruders
- Heated bed
- PEI print bed film

Printrbot Jr (put out to pasture).
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Re: Big 3D Printer

Postby mechanizedmedic » 2015-Jan-Sat-20-Jan

The largest consumer grade printers are usually not larger than 24" in any dimension, with most being about 18". The Printrbot GoLarge model is the biggest one from a decent company, IMO.
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Re: Big 3D Printer

Postby keljam7 » 2015-Jan-Sat-20-Jan

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Re: Big 3D Printer

Postby thawkins » 2015-Jan-Sat-23-Jan

There are a few things about "big" printers people should be aware of.

A "big" printer is anything over 250x250x250 which does not sound so big, but in print volume terms it is huge.

If you print a 1 inch cube at 0.2mm resolution it might take you 1 hour but to double the size and print a 2 inch cube is going to take 8 hours (in reality probaly 6 hours, because there are so geomety based savings, but the principle holds)

So in order to print the 2 inch cube in the same time as the 1 inch one, you either have to cut resolution and print at 1.6mm (you need a big nozzle) or you need to speed up your printer by a factor of 8.

In speeding up the printer the limiting factor will be the flow rate of plastic through your hotend, that is fixed and is a physical charateritisic of the hotend and extruder. Its no good getting better extruder motors with gears or upping the temp, as thats only going to get you a times 2 increase at best. The reason why is pressure, at normal printing rates and feed rates, the pressure inside your hotend is about 150-200 psi. If you want to have a high flow rate, then you need to have a much higher pressure. i have heard stories about experimeters splitting a jhead end to end due to internal pressure. All metal hotend will fair better but eventualy it will reach a limit.

That said the pressure is related to the difference between the feed stock diameter, the nozzle size, and the flow rate of the printer. The average hot end therefore maxes out at about 50-70 cubic centimeters of plastic an hour (1.75mm filament 0.4 nozzle). You can increase the flow rate by having a bigger nozzle and printing at a lower resolution.

The final problem to consider is thermal stress in the object being printed, you have all probaly experienced curl and warp in your parts, as the object gets bigger the effect rises exponentialy, untill you get to a point where it is impossible to print an object without severe warp. The big boys use expensive, pressurised heated chambers to control this. If you are going large so you can print lots of smaller objects at the same time then you wont hit this problem, but if your intent is to turn out large parts then you will have to face it. The thermal stress in a large ABS or Nylon part can generate enough force to bend a metal bed if it was suffiently well adhered and materialy strong enough. In practice it would lift or delaminate before it got to that.

If your plans are to print large parts at normal resolutions, then be prepared for some very very long print times, and a fight with warp and cracking. And if you are planning a heated bed, you will need a lot of power as the other problem with a large printer is the large bed has 4 times the surface area, and will radiate heat away at a much faster rate.

Last thing is acceleration rates, watch out for them, most printers never traverse any distance far enough to hit there max velocity, as they are limited by thier acceleration rates, but on a big printer with average rates the head can pick up some real speed on a non printing move, and unless the acceleration rates are setup up to handle the deacceleration of the head at the end of its travel. You could have the head overshooting considerably and even hitting the end of the bounds of you bed.

In summary FDM does not scale well if you are using the same tech as the smaller printers. But as long as you understand the issues building and operating big machines can be fun.
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225mm x 200mm - Heated Bed
RAMPS 1.4 running Marlin 1.1.0
Full Graphic display.
-------------------------------
Zen Toolworks CNC/3d printer
230mmx360mm bed
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Dual heated beds.
RAMPS 1.4 running Marlin 0.98
-------------------------------
Flashforge 3d Creator Pro
Dual Extruder
220x143x150mm
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-------------------------------
Photon, self designed printed printer.
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Re: Big 3D Printer

Postby DJNOS1978 » 2015-Feb-Mon-11-Feb

Build it!!!
Lol
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Re: Big 3D Printer

Postby RetireeJay » 2015-Feb-Fri-09-Feb

How big can you go, and with what quality? The automotive industry is talking about making cars with 3D printers.

Not all 3D printers are Fused Deposition Modeling ones like our Printrbots. But... if you want to build refrigerator-size objects in reasonable time, be prepared for BIG sticker shock. Like millions of dollars, perhaps? (Note that the automotive industry spends billions - yup with a "b" - when they upgrade their tooling for a new model in mass production.)
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Re: Big 3D Printer

Postby mechanizedmedic » 2015-Feb-Fri-23-Feb

If you want to buy something which prints that size you would be well served to have it made for you. Everything should scale fairly well as there are industrial automation parts readily available. The hardest part would be getting an extruder design that is reasonable. The giant delta printer that SeeMeCNC built would be a good reference.
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Re: Big 3D Printer

Postby subether » 2015-Feb-Sat-00-Feb

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Re: Big 3D Printer

Postby frankv » 2015-Feb-Sat-03-Feb

FWIW, back in the 90s I applied for a job at a whiteware company, and got a tour of the factory. Even way back then, they had automatic sheetmetal folding machines and stuff like that... essentially they had bots putting together refrigerators and stoves and stuff like that. These were built individually, not cookie-cutter style, so that the 'production line' was a whole series of different items.

Of course, this was on an industrial scale. But if you want to build stuff that size, you might be better off looking at computer-controlled sheetmetal working machines.
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Re: Big 3D Printer

Postby IB3D » 2015-Mar-Sat-15-Mar

While attending a RepRap Festival today this thread came back to mind upon seeing this.
20150321_143635a.jpg
20150321_143643a.jpg

The largest crowd however was gathered around what I would describe as a filament printer retrofitted with syringe under pressure laying out a fine bead of what appeared as UV cured resin.
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Re: Big 3D Printer

Postby Mooselake » 2015-Mar-Sat-16-Mar

Where was the reprap festival, and just where in the great lakes snow belt (I think we're around 160", with over 200 a few miles north of here, haven't looked lately; mostly melted now) are you?

Kirk
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Re: Big 3D Printer

Postby IB3D » 2015-Mar-Sat-21-Mar



Am a resident of "Michiana" and may be forced to relinquish claim to living on the edge of any snow belt after this winter...then again if history repeats itself. Most of our snow came on weekends this season, which resulted in minimal effect on my life.
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Re: Big 3D Printer

Postby Mooselake » 2015-Mar-Sun-11-Mar

"How long ago'd we leave Goshen?" Remember ?

It's 9 hours of driving from Mooseville; guess I won't make it. Darn.

Kirk
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Last edited by Mooselake on 2015-Mar-Sun-19-Mar, edited 1 time in total.
Reason: FS reference added
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Re: Big 3D Printer

Postby IB3D » 2015-Mar-Sun-12-Mar

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