Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

60ml Syringe Extruder for Liquid Deposition Modeling - LDM

by piuLAB, published

60ml Syringe Extruder for Liquid Deposition Modeling - LDM by piuLAB Sep 30, 2014


Updated version of our experimental syringe extruder, it is designed for a 60ml syringe which is the perfect dimension for our printing need. The syringe model is a luer lock type, which means you can use a lot of different nozzles from the luer lock system.
The extruder is designed for a 3Drag printer (K8200), but you can easily adapt it to other system by designing a customized mount for your machine. 3Drag is a moving bed machine, so the extruder is still during the print without any issue of moving weight. If you use this on other printer models remember to slow down all head movements like print speed, travel speed etc.
The gear reduction ratio is 5:1, which is enough for printing in clay, but not enough for more viscous materials. This ratio has been decided for dimensional constraints of 3Drag printer, but for other machines a 6:1 or 7:1 ratio it is recommended.
-For the main body we had to design a very big part, around 30cm in lenght. In the next future the main part splitted in 2 smaller parts will be provided in order to be printable with all most common FDM machines.


you will need:
-3Drag printer (https://www.futurashop.it/3d-e-cnc/stampanti-3d/stampanti-3d-1/3drag-stampante-3d-versione-1.2-in-kit-7350-3dragk)
-6x 30mm M3 bolts and nut
-2x 20mm M3 bolts and nuts
-1x M8x170mm rod
-1x M8 nut
-1x 608zz bearing
-2x C profile 133mm (6x6x1 thichness)
-4x diam 3mm x 15mm long self tapping screw
-a lot of Inj/Light 60ml Luer Lock (http://www.doctorshop.it/Prodotti/Siringa-INJ-LIGHT-latex-free-a-3-pezzi-da-60-ml-cono-luer-lock-senza-ago-6400048)
-For setting up the printer you have to determine the right E-step for your extrusion stepper (our value is 12500 steps for 1 mm of filament).
Slow down your extrusion speed around 0,5mm/s, and try to extrude 10mm of material. Measure the movement on the syringe, and solve this formula:
NewEstep = OldEstep x NominalDistance (extruded from software) / MeasuredDistance (real movement)
Set the new E-step and repeat the procedure. Once you are near to right value try with bigger extrusion distance like 50mm or 100mm to make a more precise calibration.
-In the slicer software you just have to set:
Filament diameter to 29mm (inner diameter of the syringe)
Nozzle size around to 2mm (you can change it a little on the real value)
-Check if you have enough material for the print, in Cura you can see how many meters you are using for the print. The syringe is long around 100mm, so you can use 0,1m maximum

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How to keep the M8 nut from getting out of the piston part? When I pull the piston up, it gets out.

Amazing work! Could you please tell me a bit about the clay mixtures you use? Are they air drying or is a kiln needed? I'm working on modifying my Printrbot with a paste extruder, but am having difficulty figuring out how to make my own clay paste.

Where did you get the C profile from? I'm having trouble finding it online.

Where did you get the C profile from? I'm having trouble finding it online.

Feb 7, 2016 - Modified Feb 17, 2016


is that a curing/ heating lamp directing towards the print on the first photo? What is the name of it or do you know where I can get one? My prints are quite inviscid so I need to have them solidify quite quickly.

Where did you get the C profile?

How do you disable the temperature in repetier?

in your solidworks file have one Switcher and in your instructions u didn´t said nothing about this switcher.

Ops we forgot that!
We made an upgrade to the cooling fan (for faster drying).
We have placed 2x 60mm 12V big fans on the backside of the extruder, with an external power supply, and that switch is to activate the fans.
We don't use them in any print, because a faster drying means a more stable print, but also a higher risk of shrinkage cracking (in clay prints).
So just don't care about that switch :)

Comments deleted.

Would you be willing to share the solid files? I can't seem to be able to make any changes to the stl files on my cad software.

I've just updated the files, look for the two files named "assembly" they contain all the parts for any changes you need.
.step and .iges are the standard extension for nurbs/solid models exchange.
If you can't still open them let us know and ask for a specific file format.
Anyway we're updating the model in these days because we got a stress fracture on the first version, so we'll keep you up to date for any improvement!
We're also dividing the main body in 2 separate parts to make it more printable on smaller 3D printers

Assembly files typically do not carry the part files with them, it is just a set of data that tells the software where to place the part files and how they interact. That seems to be the case in this instance for me as I am not able to open them and I get an error.

I believe it. One of the issues I've had in the past is 3d printed parts don't behave the way they do on my FEM simulations. I suppose microstructure orientation and other parameters interact in a non trivial manner and you end up having to over-design everything. Thanks for the upload though. I will definitely draw inspiration from this.

The fracture were on one of the thicker point of the main body, and crossfiber. We think that it were just a bad print, but we noticed that we have a uneven stress distribution, so we prefere to just redesign the part.
We usually don't do FEM analysis because it can't calculate fiber orientation, emptiness, printing defects and surface quality. It's almost useless. We just design the part thinking we're working with plywood, with fiber plane parallel to printing plate

Looks nice, but why did you make it non-commercial. I want to download it, but I don't like polluting my library with encumbered objects.

We made it share-alike as any of our project because we believe in the Open-Hardware comunity as a wonderful way to make improvement in 3D Printing, we made it non-commercial because we are happy if you print our extruder and you use it as you like. If you are planning to manufacture our extruder and sell it as if it was your work we're not as happy because we spent many days designing it.
If you want to sell it make your extruder model and sell your work not the work of others :)
On the other hand, if you want to sell the models you printed with our extruder i don't think there are any restrictions.

"We made it share-alike as any of our project because we believe in the Open-Hardware comunity "

No you don't. You pay lip service to the idea of open source; but that is about all. Effectively this extruder is a dead end. There is no point for anyone else to pick it up and extend it any further.

"If you are planning to manufacture our extruder and sell it as if it was your work we're not as happy because we spent many days designing it. "

and how many thousands of person years worth of effort went into the open source tools you are using? Would you even be able to do all that you can do if others had of encumbered their work the way you are encumbering yours?

Open Source culture is not about control. It's about being grateful for what we have received and when given the opportunity, giving back.


thank you for sharing (and connecting)! Looking forward to building one.

Thank you!
We've always appreciated your works and wanted to give our contribution to the clay printing comunity :)

Thank you we'll join the comunity soon ;)

Amazing. Thank you for posting this publicly. Great photos and documentation.