by smartfriendz, published

smartalu by smartfriendz Oct 24, 2016
0 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps



Design Tools



smartalu by smartfriendz is licensed under the GNU - GPL license.

Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

6196Views 1383Downloads Found in 3D Printers


Here is our last evolution of the smartrap family : The smartalu .

Taking account of reprap evolution, we are sliding to all metal construction frames, bigger printable volume and better quality.
This printer is 27x26x25 cm printable size, with all modules made with 3mm aluminium lasercut and some printed parts.
The structure is still our 20x20 aluminium frame assembled with bosh torx 6x16 screws and drilled profiles. We can't find a better system to assemble a solid frame.

The real source file lives in onshape : https://cad.onshape.com/documents/5749f861e4b0e44bdee4b8da/w/259ca1872af61bdfae87c4ff/e/1d11ee337bdf15ca9be5a6f3
It is a public document you can copy and start edit and updgrage as you like.

I've made also a sketchfab document to see the all model in real time 3d :


The official assembly doc is building at : http://smartfriendz.dozuki.com/
Still in progress but we update everyday.

Thank you.

More from 3D Printers

view more

File Name



All Apps

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

Treatstock is an online platform that offers decentralized manufacturing services such as 3D printing and CNC machining for clients all over the world. We offer free and instant access to comparati...

App Info Launch App

3D print your favourite design with NinjaPrototype, a professional 3D manufacture with consistent quality and speed.

App Info Launch App

I have one of these printers and it seems my inductive sensor is starting to make mistakes. I cannot find the model # of the inductive sensor anywhere so I can get a replacement.

Does anyone know what sensor is used on this guy?

If I were to use 6mm plate for the bed, do you think I'd need to add a third support (maybe at the front of the bed) to combat sagging, or would the 12mm rods handle the weight ok?

I have the exact same question!

I didn't try 6mm plate ( I have here so i should try ) . I do believe it's ok at this size, but if you can, it would be more secure to have 15mm rods . That i will try at first for our XL coming soon ( 500mm frame and 35 cm cube printing ).
If that doesn't work, we will maybe turn rods 90 degres and add one or two on the other side to be more straight.

Hi, big fan of smartfriendz. I have followed your progression from time to time and always wanted to a smartrap (never happened though).
As you guys mentioned in a previous comment that you use delrin wheels on normal t slot. could you hint me for what type exactly to look for? im not sure how this works without the v groove.
I want to use normal t slot extrusions from motedis.de . would any kind of wheel work with that?

Hi broot,
sorry for late reply.. thank you for following us . It's been almost 4 years now , and we are still around :)
We do use delrin v-wheels on motedis t-slot . It works very good. Even there's less contact between wheels and aluminium. It's very ok and roll very smooth, so you can go for it.
wheels are standart whels you find on aliexpress..there's a lot :)

are you using B type or I type profile? (Stepped or rounded slots)

Just interested because I'm working on a similar printer :)

Waiting for the BOM on this one!

Hi Floydam,

First version of BOM is uploaded. It should be complete , but there's alwas a lot of elements in a kit, so maybe still some missing parts.

Where is the BOM located?

It's the last file in things , but i will maybe rename it :)

Thanks! Hope I get a chance to make one.

Serge, a suggestion please: I never built but have the parts for the original Alu. Do you suggest I simply move forward with this version?

Hi Sky,

It would be almost ok, but the Z profiles are longer because we wanted to hide the all electronics under a bottom. If you use the smartrap core alu one, you will have a short Z ( around 15 cm ). Other profiles should be ok, maybe need to cut some.
Have a look at the BOM, i've just updated :)


Still looking for an answer on this. Here's what the BOM says:

Profilé libre / free profile -- What is this specifically?
Profilés 360 taraudés / threaded profile -- I presume this is 2 pieces of 360mm 2020 extrusion, correct?
Profilés 380 taraudés percés à 70mm / threaded profile, drill at 70mm -- Again, 380mm extrusion drilled and tapped at the center
Profilés 400 taraudés / threaded profiles -- 400mm extrusions, drilled and tapped at the center
Profilés 400 percés à 10mm / drilled profiles at 10mm -- 400 mm extrusions with holes 10mm from the edge

Is this all correct? From what I am seeing, does it make sense to get V-Slot extrusions vs generic extrusions because you are using what look like V-Slot wheels. I know you answered someone below about this, but I get the impression that V-Slot might be better, but I just wanted to be sure. Finally for the plates, are you using 3mm aluminum? It seems that way although the bed you say is 4mm. Can the bed be 3mm, this way I can cut everything from the same sheet.


Hi Sky,

Sorry i didn't reply.
We make diferences between profile for the preparation : they are all 2x20 T slot but we need to drill some of them and to tape some others. I need to translate better ( they are not threaded but taped :) .
I see you have well understood by the way, it's exactly that .
I've never tried but i believe it will work as good or even better with V-slot. Actually, the wheels are touching the profiles on 0.5mm on the side . With v-slot, the contact should be better. Note that it works very well actually and from our production machine, the wheels are not going bad.
Al aluminuim is 3mm but the bed that is 4mm .
Thank you,

Merci Serge. I appear to.have 2020 profiles here sufficient for this beauty. Rather than drill and tap, I will use some brackets I have here. I don't trust myself to get the holes drilled right. If my contact cannot provide the cut parts are you able to do so?

Comments deleted.

Serge, another question. The BOM is not clear as to the lengths of some.of the extrusions. When you say threaded, I presume you mean the center hole is tapped for a screw, correct? And you have 360, 380 and 400mm long extrusions? Whats the difference between a drilled and threaded profile?

Ok great! I bought the profiles as 2 looooooong pieces that have to be cut which is why I asked. I didn't want to cut anything until I saw the BOM, but now I will proceed with a build!! Merci!

is there any recommendation for hot end? which one do you use? are those chinese clones are good enough?

While people have had success with chinese clones, I've had nothing but trouble! It's pure chance, a gamble.
I suggest you go for the original thing, if E3D V6 is a bit expensive, then go for Lite6. It can't go as high as V6 in terms of temp but it's an amazing extruder. I've had it for over 6-7 months and I haven't had 1 clog yet!

Serge, can I ask you to publish a picture of the back of the printer? I would like to see how the carriage is set up. I am also interested in seeing if the carriage can support a direct drive extruder, so that I can use flexible filaments and smaller motors. Thanks!

There are plently bowden extruders that can do flexible filaments too.

I've never been able to get Bowdens to work well where the tube has long reach like this printer. Do you have some examples of solutions that make this possible? A Bowden is ideal but for what I do has required me to limit myself away from flexibles.

The assembly is a bit tricky but it works well.
There are also some commercial bowden extruders capable of doing flexible, but I don't have any personal experience with those, just youtubers reviews.

Geared bowden extruder for mk8 and flexible filament
by condac

Awesome. Thanks!

Np ;)
I'm going to post a small remix of this extruder tonight, if you plan to use this, I recommend to use the remix.
The thing is with this extruder, it doesn't have a push fit slot for outlet. The bowden tube is secured really weirdly by sandwiching the tube between 2 parts. My remix allows for an E3D push fit. (10mm diameter).

If you do post it tonight, let me know and I will print it tonight as well.

Sure, whats your push fit diameter?

I have a variety but typically for 1.75mm filament and the smaller PTFE tube. Sorry, not near the printer to check.

Push Fit Base for Geared Bowden MK8 Extruder

No, not the filament diameter, I meant the screw diameter of the push fit. If you can modify the files yourself, I'll just upload mine, which is 10mm.

No more belts for Z ... did u have bad feedback with the belts?

a part from the fall down after cuting the power, it's working very well. We have very good prints with smartrap core alu and xl.

We use now a 4mm aluminium plate of 30x30 cm and we plan to do a 45 and 55 cm ( xl and xxl ) , with this weight , we choose to come back to the standard ( 12mm rods with lmkluu and screw).like ultimaker . All that became cheap now . It was diferent two years ago.

this is very great design evolution!!!
do you use the same alu 2020 profile as in smartrapcore alu, or use now profile with v-slot (I'm sorry, but I do not know the compatibility of rollers)?

Thank you korj,

We use the same 20x20 ..Tslot. There's a lot of delrin wheels made for this profile.

Oooooh new printer! Exciting!

As usual, I continue to enjoy your progression and look forward to a build of my own. This form factor seems to be the most consistently viable one for me because it is easy to enclose and transport reliably. I can't wait to see the BOM and details.

Hi Sky :) thank you very much. The BOM is coming very son now .. It's ready and precise ( this time :)

You will need a lasercut provider to make this exact model. I already know some persons want to make a printed version of the modules.

I have access to a laser cutter and I have a small one here at home for light engraving and cutting. I have access to a 100W unit at my local makerspace and if I am cutting metal I have a resource as well. I look forward to seeing the outcome. I very much would like to assemble more than one of these and start to standardize on a specific printer style in my farm.