New type of cold end: the Vaeder V-struder

Hi,

 

Something I wanted to share and that possibly will make fdm printing compete with sls and even sla printing :)

 

To start of I invented a new type of cold end, it does not use a hobbed bolt but a belt. So there will never be any grinding of the filament anymore and way less jamming of the nozzle. I hope it will inspire a whole new type of extruders, called "v-struders" ;)

 

One of my first customers, a goldsmid, has let me know that he was able to print without any problems with a 0.1mm nozzle using moldlay wax filament. Im now searching for a place to buy a 0.1mm nozzle or even smaller so I can confirm this myself. Anyone knows a good webshop, preferably with fast shipping?

 

To this moment I was only able to test the v-struder with a 0.4mm E3D nozzle. In an extrusion only test, using petg 1.75mm at 235 degrees celcius I was able to extrude up to 2 meters per minute of raw filament without any slip in a bowden configuration with a bowden tube of 1 meter long. For higher speeds the filament would buckle inside the cold end in the gap between the belt and the ptfe tubing... probably because the hot end's thermic capicity to meld the filament was reached.

 

You can buy it here: https://reprapworld.com/?products_details&products_id/1134/cPath/1616_16...

Happy printing,

 

Vaeder

 


 

+1
1
-1

Any test results from using PLA with respect to the 90 degrees corner?

+1
0
-1

Would love to see how it does with PLA, I don't have quite so many jams with other materials. 

+1
1
-1

Wonderfull design, I agree that this is the way forward.

 

The belt extruder also ensures a 100% constant extrusion factor, soft filament digs deeper in the teeth of a (sharp) hobbed then hard brittle PLA. This effectively alters the extrusion factor by reducing the  hobbed bolt diameter

+1
0
-1

Vaeder, 

Are the geared teeth on the belt really necessary?  Have you tried a gear-less version?  It seems like you could drive the big wheel directly off your stepper and use the other two on set screws to adjust belt tension, or put them on springs.

+1
0
-1

Could this setup be used in a bowden extruder setup or is it just made for it or the direct drive?

+1
0
-1

Great idea!! I would like to see prints' pictures  :-)

+1
0
-1

In the event of a nozzle jam, what fails/gives-way?

 

Nicely done, by the way, I really like this approach. :)

+1
0
-1

This looks like a good design, but I don't see how this could bring FFF/FDM up to par with SLS or SLA. There are already extruder designs that exist that should theoretically easily manage the micron-scale features SLS and SLA can achieve, but we still can't do it because of the dynamics of melting plastic and pushing it through a nozzle.

 

As for the design itself, I do see how this would reduce grinding, but my concern is that since there's no longer anything to dig into the filament, might slippage happen if the pressure at the nozzle was higher? Of course, I haven't tested it so I could be wrong, but it just seems likely especially if the coefficient of friction of the belts wasn't very high.

+1
0
-1

This looks great, I hope the order  ships fast and that the kit is complete? I'd need to print with a variety of nozzle diameters, .2 up to .8, this looks like it could do it with enough heat and cooling.

+1
0
-1

Dang it. I had the same idea. However, I have a different idea than you, but look great.

+1
0
-1

Nice. Love the idea since i hate teeth dig and strip. Might need latger diameter for pla but still. Videos please

+1
0
-1

Check my channel:

 

In the beginning of february I'll do a demonstration in the reprapworld shop in Nootdorp, the Netherlands. We'll record it for the youtube so you all can see. And we're gonna use my next invention/design, a simple cheap filament speed sensor, to test the slip/speed of all different kinds of extruders on the market compared to the v-struder.

+1
0
-1

I loke this idea but you are not going to release stl files on this?  Can i print my own please?  This looks like a great idea, i would like make one for myself. What do you say?  

+1
0
-1

An earlier version (print at your own risk) is already on github, just search for vaeder. This version im gonna put on my own website, so I can pay some of my food and rent from the ad revenue.

+1
0
-1

Looks good, but the filament being bent while going in (80 degree) is not really optimal for filaments that are easy to break, or?

+1
0
-1

Have tried it with abs, pla, petg, bioflex, ninjaflex and many more. None seem to have issues with the bend. Im now testing a 3mm version and it seems that there it is gonna be an issue, probably have to increase the diameter of the friction wheel.

+1
0
-1

I'm in! One of the most exciting extruders i ever encountered! And it looks cool too!

+1
0
-1

Is there any way to measure how much pressure you can exert on the filament between the belts and the driver?

 

Is it comparable to this model https://0x7d.com/2014/07/improved-ultimaker-2-material-extruder/ ?

+1
0
-1

It looks familiar... The only thing with their setup is that they do not fully exploit the advantages of a belt and therefor they still had to add a hobbed bolt to the system to make it work. Actually now I look at the system more closely there is no way to tension the belts at all and the pulleys are positioned in a way that the belts cant do what they supposed to do, so you have in principle a system with 1 hobbed bolts and 4 smooth bolts in series...

+1
0
-1

This looks interesting, but I guess they don't give the STL freely. It would be nice if we could print spare parts for it. 

+1
0
-1

Design not so good as it looks.

+1
0
-1

Agreed should just have two rollers geared together with rubber grippers. I am working on this. It will be direct extrusion though bowden is not very good in my opinion.

+1
0
-1

 It does look great and I feel it's a great idea. Would you elaborate?

+1
0
-1

Nice idea! You should put a video up...

+1
0
-1

I agree, a video demo would be nice!

+1
2
-1

I'll make one this afternoon and will post it on my channel:

Not the answer you’re looking for? Ask a new question to 5303 RepRap experts active on Talk.

The 3D Printing Handbook is available now

If you’re a professional looking to master the key aspects of 3D printing, this book is for you.

The 3D printing handbook