Thinking about building a 3d printer, Prusa, check the links. Updated 12/14/14

Jeff Nading

Thinking about building a 3d printer, Prusa, check the links. Updated 12/14/14
« on February 27th, 2012, 02:38 PM »Last edited on December 14th, 2014, 01:46 PM
You will find good pricing on many of the items here, or search eBay to find them.
First thing to think about, I would suggest not buying kits without the use of linear bearings, the reason, you will not see the desired resolution on the 8" = 200mm x 8" = 200mm print bed.

I would also buy from these people.
http://www.tridprinting.com/

1. Electronics:
Here's what you will need :
Arduino-mega-2560, Ramps 1.4 with 5 stepper driver boards, Display board with cables and adapter board, wiring, fan, heated bed, thermistors, sd card and sd card reader, GT2 pulleys and belts and end stops.

2. Ramps 1.4 adapter board, plugs into the Arduino Mega 2560 board
included in electronics kit from above.


3. For the Pololu A4988 stepper drivers, you will need four for the Prusa, Rostock and Kossel Delta, need to make sure you also get the heat sinks and heat dissipation tape for the drivers,

4. SD card and adapter, most are built into the display.

5. Thermistor 100K for temperature sensing, buy at least four.

6. GT2 pulleys and belts:
Do not buy plastic pulley's, as they will crack and break, make sure the belts are long enough for your build.

7. Stepper motors:
You will need 5 for the Prusa and Mendel Max printers, 4 for the Rostock and Kossel Delta 3d printers.

These Dual shaft stepper motors are the ones I bought.
http://www.alltronics.com/cgi-bin/item/N1728D63/55/OSM-NEMA17-Dual-Shaft-2A-83oz-in-Stepper-Motor

8. Hotend , I built my own completely, I did not buy a kit, although I did buy peek and ptfe rods [expensive], I made all of the parts with the use of my lathe.

You can buy them here, J Head style
http://www.ebay.com/itm/like/321454746057?lpid=82

you can buy the element here
http://www.ebay.com/itm/261178943188?ss ... 1423.l2649

9. Endstops your choice of mechanical or hall effect, you'll need three,

10. Motor shaft Z axis couplings, buy one for each side of the Z axis, total of two for the Prusa and Mendel only.
http://myworld.ebay.com/nrg24seven/

11. Bearings: Buy 10, 608 Skate, sealed if possible and 12, LM8uu linear bearings, for the Prusa, I did grease the linear bearings.

12. Heated bed plate

13. Power supply:
I have found a power supply that will run the printer completely, heated bed, hotend, all electronics and steppers.
Google this, Power Edge 2850:
Specs:
Dell NPS- 700 ABA
Input 110 V AC
12 volts @ 57.3 amps
3.3 volts @ 5.2 amps

You can find them on ebay

Here is how to wire it to make it run:
http://www.rcgroups.com/forums/showpost ... tcount=444
http://www.rcgroups.com/forums/showpost ... tcount=450

You could also install a potentiometer, scroll down to post #461 here,
http://www.rcgroups.com/forums/showthre ... 09&page=31


14. Other items such as screws, nuts, bolts, 7.98 mm diameter, 8 mm smooth cold rolled steel or equivalent drill rod and 8 mm althread rod, you can purchase locality and will need to know lengths and size of each.

I recommend not using SAE 5/16" x 18 althreaded rods for the lead screws
Here is why:
https://www.evernote.com/shard/s211/sh/ ... dcdd2d687e

Please watch my videos on building the Prusa here
https://www.youtube.com/user/nadingjeff?feature=mhee

Other miscellaneous items:

15. Pin connectors:
http://www.ebay.com/itm/261195189899?ss ... 1423.l2649

http://www.ebay.com/itm/261195195433?ss ... 1423.l2649

http://www.ebay.com/itm/251255375501?ss ... 1423.l2649

http://www.ebay.com/itm/New-100PCS-3P-J ... 5195433%26

http://www.ebay.com/itm/100pcs-2P-Dupon ... 3cd07b5a0c

16. http://www.kaptontape.com/1_Mil_Kapton_Tapes.php

17. I bought four 25' spools of red, black, green and blue 22 gauge wire to splice into the stepper motors to lengthen their wire, but all wiring except for the power supply is included in electronics kit from above.
I also ran all the stepper motor, and opto wiring in heat shrink tubing, separately of course.

Wiring diagram for the complete printer
http://reprap.org/mediawiki/images/6/6d/Rampswire14.svg

Here is a calculator from Josef Prusa. This will calculate stepper motor step settings.
http://prusaprinters.org/calculator/


My newest Rostock Delta 3d Printer build

Click here to learn how to add YouTube Videos to your phpBB forum
http://www.thingiverse.com/thing:20355

Here is a video of how to build the Greg's hinged extruder:P
I install the hobbed bolt opposite of the way they do.

Click here to learn how to add YouTube Videos to your phpBB forum


Here's a list of links on eBay:

Arduino Mega:
http://www.ebay.com/itm/ATmega2560-16AU ... 2ed848b7f2

1.4Ramps board
http://www.ebay.com/itm/400552573704?ss ... 1423.l2649

http://www.ebay.com/itm/200954041121?ss ... 1423.l2649

Display:
http://www.ebay.com/itm/Reprap-RAMPS1-4 ... AQ:US:1123

This next one is the Arduino and 1.4 ramps board bundled from the two above with wiring and 5 stepper driver boards with heat sinks attached also includes 5 endstop switches.
http://www.ebay.com/itm/330931481152?ss ... 1423.l2649

Stepper motors:
http://www.alltronics.com/cgi-bin/item/N1728D63/55/OSM-NEMA17-Dual-Shaft-2A-83oz-in-Stepper-Motor
http://www.ebay.com/itm/121040301978?ss ... 1423.l2649

Stepper driver boards
http://www.ebay.com/itm/281206386304?ss ... 1423.l2649

If you decide to buy the above stepper driver boards and solder the pins , you will also need heat
sinks below, the heat transfer tape and cut to size.
Thermally Conductive Adhesive Transfer Tape
http://www.ebay.com/itm/181196406643?ss ... 1423.l2649

Aluminum heat sinks
http://www.ebay.com/itm/10pcs-Aluminum- ... 3f323c971a

Linear Bearings
http://www.ebay.com/itm/290638920863?ss ... 1423.l2649

Display:
http://www.ebay.com/itm/231160248691?ss ... 1423.l2649

GT2 pulley's
http://www.ebay.com/itm/330968814284?ss ... 1423.l2649

Thermistors for the heated bed and hotend.
http://www.ebay.com/itm/181182489592?ss ... 1423.l2649

Metric measurements for the top and bottom base of the Rostock 3d printer, I used 1/2" plastic but wood works as well.
http://www.thingiverse.com/thing:34359

GT2 Belting
http://www.ebay.com/itm/330967958173?ss ... 1423.l2649

608 Bearings
http://www.ebay.com/itm/370644291228?ss ... 1423.l2649

Teflon tubing
http://www.ebay.com/itm/321194262899?ss ... 1423.l2649

Fittings for Teflon tubing
http://www.ebay.com/itm/MINIATURE-Push- ... 1202918830

Heated bed, 12 or 24 volts.
http://www.ebay.com/itm/SainSmart-MK2B- ... 2191.m2338

Filament:
http://makerlibre.com/
They also have a Pay-It-Forward Incentive Program

Drill rod
http://www.ebay.com/itm/8mm-smooth-Dril ... 1078456678

Another endstop switch, need 3.
http://www.ebay.com/itm/Endstop-mechani ... 1216394383

Calculator
http://calculator.josefprusa.cz/

Kapton tape, I bought 1 1/2" wide, to print on.
http://www.kaptontape.com/1_Mil_Kapton_Tapes.php

Wiring diagram
http://reprap.org/mediawiki/images/6/6d/Rampswire14.svg

Rostock wiki will help answer questions, I still refer to it.
http://reprap.org/wiki/Rostock

Rostock on thingiverse
http://www.thingiverse.com/thing:17175

Kossel mini
http://www.thingiverse.com/thing:287103

Kossel clear
http://www.blueeaglelabs.com/

Dell NPS- 700 ABA power supply, you can take your pick from below or use an old computer PS.
http://www.ebay.com/sch/i.html?_trksid= ... &_from=R40
>
> Connectors
> http://www.ebay.com/itm/281118340136?ss ... 1423.l2649
>
> http://www.ebay.com/itm/281141423727?ss ... 1423.l2649
>
> http://www.ebay.com/itm/281097802442
>
> http://www.ebay.com/itm/281035151865?ss ... 1423.l2649
>
> Here is the correct plug for the output of the power supply and wiring connection configuration for the Dell PS.
>
> http://www.onlinecomponents.com/molex-w ... p=11903931
>
> http://www.rcgroups.com/forums/showpost ... tcount=444
>
> http://www.rcgroups.com/forums/showpost ... tcount=450
>
> http://static.rcgroups.net/forums/attac ... ontrol.jpg
>
> Scroll down in this link to #461
>
> http://www.rcgroups.com/forums/showthre ... 09&page=31
>
> Here is an enclosure and parts links for the power supply you might want to print out on your new printer.
>
> It's free for download but you will have to join the forum to download the stl's.
>
> http://open-source-energy.org/forum/sho ... hp?tid=860
>
> Metric Screws and nuts
>
> http://www.nutty.com/

firepinto

RE: Thinking about building a 3d printer, check out the links. Updated
« Reply #2, on March 21st, 2012, 05:45 AM »Last edited on March 21st, 2012, 06:04 AM by firepinto
I just found this hall effect end stop called hall-o:

http://reprap.org/wiki/Hall-%CE%98

I like the idea of adjusting via potentiometer for the Z axis.  Time to make a parts order.:)
Slic3r 0.7.0    http://slic3r.org/

Major new features:

   * a new rock-solid slicing algorithm, based on a topological approach, able to   process efficiently a wide range of STL files without any warning
   * generation of support material (optionally, with a second extruder)
   * cooling and fan control
   * ability to read the AMF format


Looks like Slic3r can do supports with dual extruders.:cool:  I'm going to have to look into that.

Jeff Nading

RE: Thinking about building a 3d printer, check out the links. Updated
« Reply #3, on March 21st, 2012, 06:27 AM »
Quote from firepinto on March 21st, 2012, 05:45 AM
I just found this hall effect end stop called hall-o:

http://reprap.org/wiki/Hall-%CE%98

I like the idea of adjusting via potentiometer for the Z axis.  Time to make a parts order.:)

Slic3r 0.7.0    http://slic3r.org/

Major new features:

   * a new rock-solid slicing algorithm, based on a topological approach, able to   process efficiently a wide range of STL files without any warning
   * generation of support material (optionally, with a second extruder)
   * cooling and fan control
   * ability to read the AMF format


Looks like Slic3r can do supports with dual extruders.:cool:  I'm going to have to look into that.
That looks very promising Nate, I added the hall effect endstops to the parts list up above, they carry them @
http://ultimachine.com/catalog/electronic-boards-and-kits/electronic-components/switches , cool stuff :cool::D:P .

firepinto

RE: Thinking about building a 3d printer, check out the links. Updated
« Reply #4, on March 21st, 2012, 06:55 AM »
Quote from Jeff Nading on March 21st, 2012, 06:27 AM
Quote from firepinto on March 21st, 2012, 05:45 AM
I just found this hall effect end stop called hall-o:

http://reprap.org/wiki/Hall-%CE%98

I like the idea of adjusting via potentiometer for the Z axis.  Time to make a parts order.:)

Slic3r 0.7.0    http://slic3r.org/

Major new features:

   * a new rock-solid slicing algorithm, based on a topological approach, able to   process efficiently a wide range of STL files without any warning
   * generation of support material (optionally, with a second extruder)
   * cooling and fan control
   * ability to read the AMF format


Looks like Slic3r can do supports with dual extruders.:cool:  I'm going to have to look into that.
That looks very promising Nate, I added the hall effect endstops to the parts list up above, they carry them @
http://ultimachine.com/catalog/electronic-boards-and-kits/electronic-components/switches , cool stuff :cool::D:P .
I didn't think to look there, 13 bucks is pretty cheap.  I'd probably pay that in shipping for components from china.  Just put a order in.  You see that they raised PLA prices?  Kinda sucks.

Jeff Nading

RE: Thinking about building a 3d printer, check out the links. Updated
« Reply #5, on March 21st, 2012, 08:30 AM »
Quote from firepinto on March 21st, 2012, 06:55 AM
Quote from Jeff Nading on March 21st, 2012, 06:27 AM
Quote from firepinto on March 21st, 2012, 05:45 AM
I just found this hall effect end stop called hall-o:

http://reprap.org/wiki/Hall-%CE%98

I like the idea of adjusting via potentiometer for the Z axis.  Time to make a parts order.:)

Slic3r 0.7.0    http://slic3r.org/

Major new features:

   * a new rock-solid slicing algorithm, based on a topological approach, able to   process efficiently a wide range of STL files without any warning
   * generation of support material (optionally, with a second extruder)
   * cooling and fan control
   * ability to read the AMF format


Looks like Slic3r can do supports with dual extruders.:cool:  I'm going to have to look into that.
That looks very promising Nate, I added the hall effect endstops to the parts list up above, they carry them @
http://ultimachine.com/catalog/electronic-boards-and-kits/electronic-components/switches , cool stuff :cool::D:P .
I didn't think to look there, 13 bucks is pretty cheap.  I'd probably pay that in shipping for components from china.  Just put a order in.  You see that they raised PLA prices?  Kinda sucks.
Yes, I saw the prices, there is such a demand for pla and abs, I think I am going to build a machine to extrude filament. I am mostly using abs now, works well.

firepinto

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #11, on June 30th, 2012, 05:14 AM »
Quote from ~Russ/Rwg42985 on June 30th, 2012, 02:50 AM
It looks like a good price for an assembled board.  Ultimachine sells them at the same price:
http://www.ultimachine.com/content/ramps-pre-assembled-kit

I saved 20 dollars by going with the DIY kit with pre soldered SMT components:
http://www.ultimachine.com/content/ramps-diy-kit

You will also need a minimum of 4 stepper drivers, 5 if you will be using 2 extruders in the future.  
http://www.ultimachine.com/content/pololu-a4988-stepper-driver-heatsink-kit


If you haven't already bought the Mega board this kit comes with everything:
http://www.ultimachine.com/content/ramps-diy-kit-complete

~Russ

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #13, on June 30th, 2012, 05:38 AM »
Quote from firepinto on June 30th, 2012, 05:14 AM
Quote from ~Russ/Rwg42985 on June 30th, 2012, 02:50 AM
It looks like a good price for an assembled board.  Ultimachine sells them at the same price:
http://www.ultimachine.com/content/ramps-pre-assembled-kit

I saved 20 dollars by going with the DIY kit with pre soldered SMT components:
http://www.ultimachine.com/content/ramps-diy-kit

You will also need a minimum of 4 stepper drivers, 5 if you will be using 2 extruders in the future.  
http://www.ultimachine.com/content/pololu-a4988-stepper-driver-heatsink-kit


If you haven't already bought the Mega board this kit comes with everything:
http://www.ultimachine.com/content/ramps-diy-kit-complete
Haha well crap! Lol Jeff, you may want to ad that on the first post! Lol much eazer! ( geting over whelmed here lol)

is there a hard were kit also? With SS rods?

Looks like the slide berings come in a 12 pack? Or is that 1 each? That eBay post is confusing.

Thanks guys! Want to build this thing!

Thanks to Jeff for the huge jump start!!!

Can I not just add hot wires to the AL plate you made Jeff?
~Russ

Jeff Nading

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #14, on June 30th, 2012, 05:58 AM »
Quote from ~Russ/Rwg42985 on June 30th, 2012, 05:38 AM
Quote from firepinto on June 30th, 2012, 05:14 AM
Quote from ~Russ/Rwg42985 on June 30th, 2012, 02:50 AM
It looks like a good price for an assembled board.  Ultimachine sells them at the same price:
http://www.ultimachine.com/content/ramps-pre-assembled-kit

I saved 20 dollars by going with the DIY kit with pre soldered SMT components:
http://www.ultimachine.com/content/ramps-diy-kit

You will also need a minimum of 4 stepper drivers, 5 if you will be using 2 extruders in the future.  
http://www.ultimachine.com/content/pololu-a4988-stepper-driver-heatsink-kit


If you haven't already bought the Mega board this kit comes with everything:
http://www.ultimachine.com/content/ramps-diy-kit-complete
Haha well crap! Lol Jeff, you may want to ad that on the first post! Lol much eazer! ( geting over whelmed here lol)

is there a hard were kit also? With SS rods?

Looks like the slide berings come in a 12 pack? Or is that 1 each? That eBay post is confusing.

Thanks guys! Want to build this thing!

Thanks to Jeff for the huge jump start!!!

Can I not just add hot wires to the AL plate you made Jeff?
~Russ
My links are good, it's the one you asked about that has no data,motor link here
http://www.alltronics.com/cgi-bin/item/N1728D63/55/OSM-NEMA17-Dual-Shaft-Stepper-Motor
 and yes the linear bearings are a 12 pack,
http://www.ebay.com/itm/RepRap-Prusa-Mendel-Bearing-set-/270949810324?_trksid=p4340.m1850&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D11%26m

i'll be gone till about 1:00 will be home after that, I have skype now , user name is cncplasma, if you want to chat, thanks, Jeff.:D

Jeff Nading

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #15, on June 30th, 2012, 06:07 AM »Last edited on June 30th, 2012, 02:47 PM by Jeff Nading
Quote from Jeff Nading on June 30th, 2012, 05:58 AM
Quote from ~Russ/Rwg42985 on June 30th, 2012, 05:38 AM
Quote from firepinto on June 30th, 2012, 05:14 AM
Quote from ~Russ/Rwg42985 on June 30th, 2012, 02:50 AM
It looks like a good price for an assembled board.  Ultimachine sells them at the same price:
http://www.ultimachine.com/content/ramps-pre-assembled-kit

I saved 20 dollars by going with the DIY kit with pre soldered SMT components:
http://www.ultimachine.com/content/ramps-diy-kit

You will also need a minimum of 4 stepper drivers, 5 if you will be using 2 extruders in the future.  
http://www.ultimachine.com/content/pololu-a4988-stepper-driver-heatsink-kit


If you haven't already bought the Mega board this kit comes with everything:
http://www.ultimachine.com/content/ramps-diy-kit-complete
Haha well crap! Lol Jeff, you may want to ad that on the first post! Lol much eazer! ( geting over whelmed here lol)

is there a hard were kit also? With SS rods?

Looks like the slide berings come in a 12 pack? Or is that 1 each? That eBay post is confusing.

Thanks guys! Want to build this thing!

Thanks to Jeff for the huge jump start!!!

Can I not just add hot wires to the AL plate you made Jeff?
~Russ
My links are good, it's the one you asked about that has no data,motor link here
http://www.alltronics.com/cgi-bin/item/N1728D63/55/OSM-NEMA17-Dual-Shaft-Stepper-Motor
 and yes the linear bearings are a 12 pack,
http://www.ebay.com/itm/RepRap-Prusa-Mendel-Bearing-set-/270949810324?_trksid=p4340.m1850&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D11%26m

i'll be gone till about 1:00 will be home after that, I have skype now , user name is cncplasma, if you want to chat, thanks, Jeff.:D
Russ, on the hardware kit  you can watch my videos, the sizes are listed or skype me this afternoon, all the rod links are going to be longer than what the wiki says, on the 5/16" nuts and washers just buy 100 of each, the other bolts I can tell you when or if you skype me, or I can email you later with the sizes.

Jeff Nading

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #16, on June 30th, 2012, 12:02 PM »
Quote from ~Russ/Rwg42985 on June 30th, 2012, 05:38 AM
Quote from firepinto on June 30th, 2012, 05:14 AM
Quote from ~Russ/Rwg42985 on June 30th, 2012, 02:50 AM
It looks like a good price for an assembled board.  Ultimachine sells them at the same price:
http://www.ultimachine.com/content/ramps-pre-assembled-kit

I saved 20 dollars by going with the DIY kit with pre soldered SMT components:
http://www.ultimachine.com/content/ramps-diy-kit

You will also need a minimum of 4 stepper drivers, 5 if you will be using 2 extruders in the future.  
http://www.ultimachine.com/content/pololu-a4988-stepper-driver-heatsink-kit


If you haven't already bought the Mega board this kit comes with everything:
http://www.ultimachine.com/content/ramps-diy-kit-complete
Haha well crap! Lol Jeff, you may want to ad that on the first post! Lol much eazer! ( geting over whelmed here lol)

is there a hard were kit also? With SS rods?

Looks like the slide berings come in a 12 pack? Or is that 1 each? That eBay post is confusing.

Thanks guys! Want to build this thing!

Thanks to Jeff for the huge jump start!!!

Can I not just add hot wires to the AL plate you made Jeff?
~Russ
Russ I'll email you some photos of what I did to make heaters for the aluminum plate.

~Russ

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #17, on June 30th, 2012, 12:52 PM »Last edited on June 30th, 2012, 12:54 PM by ~Russ/Rwg42985
Ok, or just post them on a new thred? "heater plate" or you may allready have a thred on them?

I'll need to look over that SS rod thing as I know you had mentiond that before.

I just hate getting the wrong stuff!!! Lol

Thanks!!  ~Russ

firepinto

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #19, on July 1st, 2012, 06:53 AM »
Quote from TinMan on July 1st, 2012, 06:10 AM
Well ere is something i picked up from my dad's that was burried in one of the cuboards.Im not sure what is was or was going to be ,but is there any useful bits for building a 3d printer in it?

https://www.youtube.com/watch?v=4cpw6f0Po-c
That is an excellent looking machine Tinman!  It looks like he was building a cnc router.  It should be fairly easy to convert it to a "Repstrap".  I would gut out all the old electronics and replace them with an arduino with a RAMPS sheild.  Im pretty sure the stepper motors can be used, just have to sort out which wires are needed.  The smaller motor looks like it would work for a geared extruder too.  Then you just need a bracket for the extruder and a way to heat the bed.  It has all the limit switches for the Y axis, I couldnt see if there is for the X and Z.  
That would be a monster reprap. :cool:  It would print a little slow but it could print your next printer.:D  Once it is running on RepRap firmware, I would also set it up for PCB milling which it would work extreamley well for.  

Nate

~Russ

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #20, on December 1st, 2012, 03:44 AM »Last edited on December 1st, 2012, 04:31 AM by ~Russ/Rwg42985
jeff, was thinking about this motor:

https://www.sparkfun.com/products/10846

we can do 400 steps instead of 200.

thoughts?

and is there a setting for 400 steps in the software?

also found these for 12.99 ? same thing? will they work?

http://www.automationtechnologiesinc.com/products-page/3d-printer/nema17-stepper-motor-kl17h247-168-4a-3d-printer

and here:

http://www.circuitspecialists.com/nema_17_stepper_motor_42bygh404.html

thoughts?

~Russ

better yet this looks like a winner:

http://www.ebay.com/itm/5-PCS-NEMA-17-CNC-Step-Stepping-Stepper-Motor-40mm-1-7A-56-6oz-in-Bipolar-/281022854077?pt=LH_DefaultDomain_0&hash=item416e4473bd

seems to be the correct specs. others on eBay have 4mm shafts and are over 2 A rating...

only thing is that these are ( Holding Torque:40 N.cm (56.6 oz-in)) ??

Jeff Nading

RE: Thinking about building a 3d printer, Prusa, check out the links. Updated
« Reply #22, on December 1st, 2012, 05:45 AM »Last edited on December 1st, 2012, 05:59 AM by Jeff Nading
Quote from ~Russ/Rwg42985 on December 1st, 2012, 03:44 AM
jeff, was thinking about this motor:

https://www.sparkfun.com/products/10846

we can do 400 steps instead of 200.

thoughts?

and is there a setting for 400 steps in the software?

also found these for 12.99 ? same thing? will they work?

http://www.automationtechnologiesinc.com/products-page/3d-printer/nema17-stepper-motor-kl17h247-168-4a-3d-printer

and here:

http://www.circuitspecialists.com/nema_17_stepper_motor_42bygh404.html

thoughts?

~Russ

better yet this looks like a winner:

http://www.ebay.com/itm/5-PCS-NEMA-17-CNC-Step-Stepping-Stepper-Motor-40mm-1-7A-56-6oz-in-Bipolar-/281022854077?pt=LH_DefaultDomain_0&hash=item416e4473bd

seems to be the correct specs. others on eBay have 4mm shafts and are over 2 A rating...

only thing is that these are ( Holding Torque:40 N.cm (56.6 oz-in)) ??
Russ, I would really stick with what I know will work. This is what I have used on my last two builds and they work fine, you can also see the specs on them.
http://www.alltronics.com/cgi-bin/item/N1728D63/55/OSM-NEMA17-Dual-Shaft-Stepper-Motor  
I'm not sure the driver boards will work at 400 steps per revolution, there made for 200 @ 1.8 degrees per step. Also the shaft length is important, longer the better. The one on ebay I think would work. You'll just have to cut a flat on the shaft, to lock the gear in place.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=281022854077&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en