RepRapPro Tricolour Mendel

by RepRapPro, published

RepRapPro Tricolour Mendel by RepRapPro Feb 15, 2013


Here are all the 3D printed parts for the RepRapPro Ltd version of Mendel. This is a three-head machine, so it will do colour and multi-material printing. But if you only want one colour, just leave off two extruders and drives, and the slave controller electronics...

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Is it possible to have 2 slaves?

And can you use the slave board for another 3 endstops?

Is this the same as the master/slave melzi thing?

Where can I get schematics, instructions, firmware, etc.?

Yes, this would be possible in principle, however you would then be forced to use the same material in the two nozzles and also they would both have to be on at the same time, which would mean that the one that was not being used would tend to ooze.

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RepRapPro Tricolour Mendel by RepRapPro is licensed under the GNU - GPL license.

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The master version of all the files for this is on Github here:


See that link for the latest version of all the files.

The .ZIP file contains the trays of printed parts you need to make a complete RepRapPro Tricolour Mendel except the extruder. For the extruder, see Github here:


The two production trays are included for ease of printing if you have a 3D printer with a build area of 200x200mm or greater. Or the individual STL files are also included; it should be possible to print all these on virtually any 3D printer.

RepRapPro Tricolour has been specifically designed to work with three colours or three different plastics at the same time. Also we've made a lot of changes in order to make it ease to use :

-The volume and number of printed parts have been reduced so it's easier to assemble and more reliable.
-We have enhanced the widely-used Marlin firmware to allow the addition of a slave controller board to drive the extra extruders. And we are using the Arduino-compatible Melzi electronics for both the master and slave controllers.
-We've released our own RepRapPro Slicing software(Beta) in order to print multimaterial parts. Whilst Slic3r also supports multiple colours, we are currently working on modifications in order maximise multicolour print quality.
-The extruders are now specifically designed to come apart when the plastic filament being driven is in the drive the filament itself holds the drive together securely. But with no filament in it, the drive dismantles without tools for easy cleaning and servicing.
-The build volume has been increased when using multiple extruders to 210x190x140mm.
-The x-carriage is capable of supporting up to four extruders with future electronics, but three with the current generation. However this fourth extruder mount also allows for other tools and accessories, such as an extruder fan mount for higher quality PLA prints at fine layer heights.
-The Y bed is now mounted on stiffer springs and cap screws to ensure a more rigid bed and higher quality prints.
-The Y motor mount has now been redesigned to be made from laser cut MDF or to be printed and results in a much quieter machine.
- Belt tensioners are now easy to access for improved maintenance

All the assembly and commissioning instructions are here:


That is the master version; the instructions are also on the
RepRap Wiki here:


RepRapPro sells both complete kits (and also kits containing everything except the printed parts if you want to print your own) here:


Of course, anyone else is free to do the same.


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evamvid on Aug 1, 2013 said:

would it be possible to have two hotends share a heater block

with heater block in the middle and the nozzles on either side....

RepRapPro on Aug 6, 2013 said:

Yes, this would be possible in principle, however you would then be forced to use the same material in the two nozzles and also they would both have to be on at the same time, which would mean that the one that was not being used would tend to ooze.

evamvid on Aug 1, 2013 said:

what electronics are used?

Is there a heatbed?

RepRapPro on Aug 6, 2013 said:

The Tricolour uses two Melzi boards and there is a heated bed.

smartroad on Apr 24, 2013 said:

what would need to be done to the first RRP Mendel to upgrade the X axis to this new version?

ajayre on May 12, 2013 said:

Print out the new parts, obtain a MXL belt and obtain a MXL pulley with a 5mm shaft hole.

skipper61 on Apr 20, 2013 said:

Why can't I download a item at a time??
It will for sure go wrong to print a hole "tray"!!!

markab on Apr 20, 2013 said:

You can get the individuals from github, link above I think.

PieterBos on Apr 5, 2013 said:

Just wondering does it come with 3 hot-ends (would be amazing)

ottovdv on Apr 5, 2013 said:

it does!

PieterBos on Apr 5, 2013 said:

Want :-)

wantmys2000 on Feb 28, 2013 said:

What will be needed to also upgrade the Y Frog? When I increase print speed the spring mount is what shakes on my current Mendel.

My RepRapPro Mendel is only a few weeks old, and I would like to be able to bring it up to spec with this new Mendel. Are there plans on selling a full upgrade package vs. paying for the color upgrade pack that only adds the extruders and Hot Ends to the now old carriage design?

RepRapPro on Mar 4, 2013 said:

Again the Y axis is running on MXL belt, but we've upgraded the mounts and springs to M5 from M3 to improve rigidity and to easy the issues you mention. The exact BOM is now on the wiki, but the frog itself is a slightly different design to make it symmetric and to allow for the M5 mounts.

There aren't any plans at this exact second to do an upgrade kit, but we welcome the feedback and it may happen if enough people express an interest :)

markab on Feb 19, 2013 said:

Is this new x-axis and carriage design a direct swap for the axis and carriage on the older frames?

RepRapPro on Feb 19, 2013 said:

No - it is not a direct swap. We have changed the design to offer more Z head and a greater number of extruder mounting points.

RepRapPro on Feb 17, 2013 said:

idolcrasher All of the design files for the Mendel, including the DXFs, may be found on our Dev-v1.1 branch. https://github.com/reprappro/M....

All of the design files for the extruder, again with part drawings and DXFs, may be found on our Dev branch,https://github.com/reprappro/M....

Bare with us, we're having a few issues merging all the relevant branches into the master. We're not due to ship any of the new machines for 30 days, during which time we will work on the instructions and finalising the bill of materials.

idolcrasher on Feb 17, 2013 said:

I believe the extruder can be found here:https://github.com/reprappro/M...

In fact, the extruder seems to be the only STLs listed under the Multi-Color Printer on GitHub. The STLs here on thingiverse don't appear on Githhub?

I am also not sure I see dxf files for the multi color mendel.

RepRapPro on Feb 17, 2013 said:

We've just updated all the files on thingiverse, hopefully thats a little more coherent.

natko on Feb 16, 2013 said:

Nice but why not post this as four head printer, as the head mount is for four heads.

RepRapPro on Feb 16, 2013 said:

At present our electronics only support three heads although the mechanics could potentially support four.

idolcrasher on Feb 16, 2013 said:

Good Day,

It is great to see a new RepRap Pro machine!

I downloaded the STL trays you posted and noticed that they did not include the extruder. Where my I download the STLs for the extruder?

Thanks much!