EchoRap Rev1

by StephaneRousseau, published

EchoRap Rev1 by StephaneRousseau Oct 17, 2012


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The EchoRap is a simple and robust RepRap designed by Robotic Sequencing in Montreal’s first and only Fab Lab, ÉchoFab. It’s a low cost and simplified version of the original RepRap using tubes instead of threaded rods for a different geometry. The design is licensed under Creative Commons Non-Commercial, so if you have acces to a 3D printer, you can print one for yourself or to give to a friend. Files to print parts are available on Thingiverse.

The design allows builders to build it as a RepRap or a RepStrap.
All parts can be printed or cut.
Assembly of the structure is very easy: tubes and simple coupling.
The X Y Z axes can be enlarged using longer tubes and rods.
Current table size allows the use of standard Mendel or Prusa heated beds.
Gen7 Electronics, PrintrBoard rev D has been tested and works well. Other RepRap electronics can also be used. All the sofware is Open-Source.


Overall Dimensions: 510mm x 585mm x 540mm (20.1in x 23.1in x 21.26in)
Weight: 8.18kg (18lbs)
Usable Print Area: 220mm x 220mm x 200mm (7.9in x 7.9in x 7.87in)

Note: REV 1 add stiffness to the X axis by replacing the 2 P4Z Top Mount with 2 extra P3Z with 608zz bearing to add stiffness to the X carriage.


Items / Quantity

Y axis Tube 1.125" 14" / 2
X axis Tube 1.125" 15" / 2
Z axis Tube 1.125" 15" / 2
Top Tube Handle Bar 1.125" 23" / 1
Tube Joint / 18

EchoRap Specific Parts
P1Y NEMA 17 Mount / 1
P2Y Bearing Holder / 1
P3Z NEMA 17 Mount / 4 (Rev 1 change quantity from 2 to 4)
---- Rev 1 removed part: P4Z Top Mount / 2 -----
P5X NEMA 17 Mount / 1
P6X Right Mount / 1
P7 Extruder Mount / 1
P8 Table / 1
P9 LM12UU Holder / 8
P10 Adaptor 1.125" to 12mmx0.5" long / 12

Moving Parts
12 mm Rod 13" / 4
LM12UU Linear Bearing 12x21x30mm / 8
608ZZ Bearing (to build structure, extruder not counted) / 4 (Rev 1 change quantity from 2 to 4)
5/16 18TPI Threaded Rod 13" / 2
Pulley GT2 36 teeth, 6mm width / 2
Belt GT2 497 teeth, 6mm width / 2

M3 X 12mm Socket Bolt (motor mount) / 20
M3 X 25mm Socket Bolt (P1, P2, P3, P4 attach) / 6
M3 Hex Nut / 6
Multipurpose Miniature Tie 102mm / 100
5/16 Nut / 4
M8 X 30mm Bolt / 2
M8 Lock Nut / 2
M8 Washer / 4
M8 Large Washer / 4
L-Shaped Metal Mount 50mmx50mmx12mm / 2

NEMA 17 Stepper Motor 62 oz-in / 5
PrintrBoard rev D / 1
Extruder Wade / 1
Hotend J-Head / 1
PCB Heated Bed MK1 or more / 1
ATX Power Supply / 1
Motors Cables / 5
Other Cables / 7

Files to make one
échoRap Wiki (in french)
Firmware for PrintrBoard Rev D on GitHub.
Firmware for RepRap Gen7 Electronic v1.3.1 on GitHub.

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What kind of tubing was used?  
In China some people are using ABS coated steel pipe in place of extruded aluminum.  Is that what this is?
I tried making a printer out of EMT conduit, but the pipe was not as rigid as extruded aluminum.  

Hi Justin,

It's ABS coated steel pipe. It's inexpensive, solid and have a nice look. You can have different colors:-)

Would you please post information regarding the ABS coated pipe.  I can only find it in China.  Who are the good manufactures?  Who are good resellers? 

 i just notice that the P6right mount does not have a hole for the bearing. did you just drill a hole after printing?

Nice observation, thanks :-) I uploaded the correct P6RightMount with the hole for the M8 bolt to hold the bearing.

BTW there is another Fab lab/hacker space in MTL its called Foulab.

Yes, there is Foulab a nice hacker space, they have a nice rodstock working. And there is Eastern Bloc that have a lab for members. These are the one I know.

Thanks . .great stuff . .

 hi, kindly upload the p7extruder mount. thanks. im trying to convert my filament spool holder into a echorap :)


It's uploaded :)

hmmm that frame reminds me of my old RepStrap built from the legs of a draftsman's table. Gives me some ideas to possibly resurrect it

That's attractive looking. I have to ask though, if neither the Z guide rods nor the threaded rods are attached to the vertical tubes, what are the tubes for?

Hi Ben,

Tubes are there for transportation, support filament spool and there is optional part P4 that rigidity to the z axis.

Thank you for your comment.


Here are the links:

http://www.youtube.com/v/3Qng64k36mwEchoRap in action
http://www.roboticsequencing.com/products-2/echorap/Files to make onehttp://www.roboticsequencing.com/products-2/echorap/Pre-orderhttp://www.echofab.org/wiki/index.php/%C3%89choRapéchoRap Wiki (in french) https://github.com/roboticseq/RSEchoRapSprinterForPrintrBoardRevDFirmware for PrintrBoard Rev D on GitHub. https://github.com/roboticseq/RSEchoRapMarlinForGen7v131Firmware for RepRap Gen7 Electronic v1.3.1 on GitHub.

The link to the video is not working for me, so here is teh full URL: http://www.youtube.com/watch?v=3Qng64k36mwhttp://www.youtube.com/watch?v...