Posts made by Zatsit

@t3p3tony
Many thanks to all my backers, who allowed Zatsit to be born!

@keyz182
Just after the end of the KS campaign, two new pages will appear on my website www.zatsit.fr : STORE and DOWNLOADS.

You will be able to download the configurations for the different systems I was able to try, including of course Duet WiFi.

@maukvdlaan
I am considering a similar project, for a CNC specialized in the machining of Hylite composite plates, including both milling cutters and saw cutters.
I need 5 Z axes carried by the same Y slide. I think I will limit the Z stroke to about ten mm, and I hope to keep the moving masses reasonable.
I think I can handle all this with MachineKit, unless the Duet 3 option comes up fast enough: my project is not immediate.

@deckingman
This filament containing nanodiamonds does not wear out the nozzles, because firstly these particles are practically round, and secondly their size is homogeneous around 10 nanometers (supplier's data).

@deckingman
I would like to draw your attention to a very special PLA filament, whose thermal properties have been modified with diamond nanoparticles, Carbodeon's uDiamond. This filament doubles, at least, the extrusion rate for a given hot-end/nozzle.

I experienced this during mechanical speed tests (and not extrusion flow test), to check the behaviour of my Zatsit hinged delta at high speed, with regard to ringing, and the speed/print quality ratio.

The hot-end I use usually delivers, with a standard 0.4mm nozzle, about 8mm3/s. With the uDiamond PLA, the throughput exceeded 15mm3/s, which allowed the printer to be tested at up to 560mm/s, with standard Hot-End and nozzle.

This shows the huge influence of the filament itself, for questions of extrusion throughput.

@rcarlyle
Yes, this small stainless steel tube, thus cooled, opens up a whole bunch of possibilities, which I am currently developing, and which I hope to be able to offer after Kickstarter.

1 - The volume of the Hot End can be divided by 5, and the weight reduced by 3, by directly integrating a miniature nozzle at the bottom of the tube. It is the tube+nozzle assembly that would become interchangeable, rather than the nozzle only.

2 - These miniaturized hot-ends make it possible to have a very light extrusion head, of the Direct/remote type, with two or four independent extrusion channels, but with a single drive motor, in the Flystruder position. I have already made a single-track version, which works extremely well.

Delta printers have great qualities, but they were generally limited by their single-channel Bowden tube. With 4 printable materials, you can imagine the possibilities!

@deckingman
Yes, of course.

@deckingman said in Zatsit printer:

could you supply shorted lengths of this tube

Probably.... What do you have in mind?

@deckingman
Yes, all accessories, including this adapter for Hot-end watercooling, are available independently of the Zatsit kit, during the campaign on Kickstarter, and then on the online shop that will follow.

Take a look at the Kickstarter page, it says it all!

To manufacture this adapter, I use a specially modified small lathe with a special saw to cut the tube straight, and without blurr.

@fma
You're right : 350°C, not 400°C. It doesn't change my conclusion.

@deckingman
It's a very relevant question, and I spent a lot of time on it!

I first soldered the two parts with silver, but this inevitably leads to a change in the internal surface condition of the tube which loses its polished finish even in the transition zone, and in fact, I noticed a less regular operation with the PLA, for the Hot-Ends so made. I use a medical tube, which is very finely electro-polished inside, probably for aseptic reasons. I think that the spectacular resistance to jamming, which I have seen, even with PLA, is largely due to this excellent surface condition in the transition zone.

So I understood that I had to preserve this polishing, and use a cold assembly, with a press-fit.

Pressing too hard necessarily reduces the diameter of the stainless steel tube, which is not in the right direction. I came to a compromise, with a tube tightened just enough to ensure that there would be no leakage in any circumstance, and a needle punch on the tube's face to prevent it from being driven away by extreme pressures.

These details are very important, and that is why, in my production plan, this part will be the only one I will personally produce, with my lathe adapted for this purpose, at a rate of 20 parts/hour...

@fma
PTFE does not decompose in a toxic way until 400°C. From 250°C, its mechanical characteristics deteriorate. It flows, in particular.

In our case, this small tube does not support any mechanical effort, it is simply there as a stop during installation, and therefore, PTFE does the job very well.

@fma
The joint between the stainless steel tube and the flexible hose is reliable and stable, and can be forgotten indefinitely.

Its only weakness concerns the possible strong mechanical stresses while it is hot.

The flexible hose is cooled by the water flowing through it, but there is a thermal gradient in its thickness, and some of the material is softened. If you pull it hard while it is hot, you can create a leak. I realized this because I keep fiddling with my prototypes, but there's no reason for a normal user not to force the water tube while the machine is running!

And in any case, repair, if necessary, would be child's play!

@fma
Pardon Frédéric, c'était juste pour faire une blague en introduction ! Merci de votre soutien !

Please excuse the somewhat chauvinistic enthusiasm of my compatriot Frederic: it is not French "en plus", it is just French. The French are considered pretentious all over the world, so there's no need to add to that!

Joking aside, thanks to Tony for drawing attention to Zatsit, and thanks also, of course, to my distinguished backers!

In this forum, you are all supposed to already have a 3D printer with a Duet controller on it. So let me also talk about accessories, which can be adapted to all existing machines, especially deltas.

Thanks to the engraved Hylite technology, it is very easy to make gimballed supports for remote accessories (extruder, blower fan). This has significant consequences on print quality, as the effectors can be lighter, parasitic forces on them are reduced, and the length of the Bowden tube can be halved. These brackets attach to any 6mm T-slot, so they are universally applicable. Here is a video that explains it.

The gimballed support for a Flystruder based on Titan extruder, adapts to absolutely any delta machine, with even more obvious improvements: the Bowden tube is reduced to 17cm, while disturbing as little as possible the movements of the Hot-End. Here is the video.

Finally, one of Zatsit's major innovations is its Hot-End, so simple that you won't believe it! Here is the video.

I first wanted to obtain a larger exchange chamber with cooling water, with many unnecessary complications, before realizing that it worked strictly as well with a simple 4/6mm tube, pierced! Since I have been using a pre-hole formed with a very precise biopsy punch, the seal is extremely reliable. And in two years, the Hot End has never jammed, with any filament. Never! The only problem I had was stupidly pulling a very hot TPU filament by hand, which obviously immediately stuck to the cold zone.

Since I have to put some coal in the boiler, let me to provide the link toward Kickstarter (with many interesting info, anyway). Thanks for watching!

Hello, everyone!

I have recovered the blower fan from a CPP machine, and I use it as a remote fan for cooling printed objects. It is a compact, silent and very powerful unit, which, combined with an efficient diffuser, is capable of terrorizing any filament, as soon as it leaves the nozzle.

The motor is a three-wire brushless, which I connected to a brushless driver module from ebay. This module is controlled by a variable voltage from 0 to 5V. For the moment, I use a potentiometer.

My question is: how to order this module from pin Fan0, which provides controlled grounding in PWM?

I have mounted a passive integrator, using a 47µF capacitor and a 2.2kOhms resistance, but I only get an on/off control, and inverted (0 = Full motor, any PWM value = motor off). But full motor, it's scary!

How do I build the interface circuit? Thank you!

@cubexupgrade
Thanks for your interest ! We finalized the shooting for the kickstarter videos last sunday, so, I hope to launch the campaign in March. Stay tuned !

Thanks for the advice. I didn't abuse the driver in any way : the extruder was running as usual since 5 weeks, and suddently stopped, without obvious reason…

Too bad to be separated from my Duetwifi: it is the best board of four that I successively connected to my Zatsit delta printer, for testing.

My machine now works correctly after I connected the extruder to E1 instead of E0, and remapped it.

I try however a little up, trying to understand what happened to my driver TMC2660 of the output E0 …

Is there a diagnostic procedure for the TMC2660, other than simple evidence that it is no longer feeding the coils ?

Only one extruder was connected to E0, then to E1.

In fact, I did not understand that the M92 Exxx: yyy syntax addressed two extruders. Can you point me to a documentation?

What about the diagnostic procedure for the failed driver? According to the TMC2660 datasheet, it is protected against anything that could happen, and precisely nothing happened to it ! I hope this will work out with a proper reset procedure …