Hello everyone, let me indroduce you to Nimax. (On the picture he is kinda blurry because he’s moving(not printing) at 350mm/s)
Now i just have to figure out what bowden feeder to use… Any thoughts on that?
Airtripper! Upload a video to see it at 350 please. I would like to see the bed moving at that speed 
@Javier_Prieto thing is… There is no moving bed!
@Niklas_Smth does the z structure moves in the X axis??
Make sure your bowden tube is a proper fit for the filament. For high speeds like that, you may need a strong extruder like one of the dual motor extruders, but I am not sure about that since I do not try to print fast and think my quality would not be good at such speeds. Do not confuse maximum speed with actual speed. With acceleration limits, you might never reach your maximum speed. There are many back and forth movement in printing.
@Javier_Prieto exactly. Because i was tired of small printing areas on big machines. This takes 300x600mm desk space and it can print on pretty much all of it.
@NathanielStenzel i have a PTFE that is 3.1 mm inside, but actually i haven’t really figured whether to even use 3mm filament. I have PTFE Tube with 1.85mm inside as well. This was a speed test and a speed test only. The acceleration is very smooth and therefore its possible to run fast along the X axis(600mm) and get up to 350mm/s. I Highly doubt i will be printing that speed frequently.
the crooked beltbath and the long unsupported lever in combination with the claim of 350mm/s printing speed…
@Rene_Jurack good points…
Gonna ring like CRAZY on x moves near full Y extension.
@Rene_Jurack ok please point out for me where I claim 350mm/S printing speed. Read the comment just above your own. No reason to be a fkn douchebag.
@Ryan_Carlyle yeah well to be honest that was my biggest issue when i started to design this thing. It has been rebuilt several times as well, and I think I have a more optimal solution for it now as it seems. I will post test prints and you’ll ser how stirdy it actually is.
@Aric_Norine yes I did. And it was. Moving, not printing. IF you read the comments I have already stated this was a speed test of the mechanics.
Aside from the ringing, I’m worried that the Z rail (igus, right?) will even bind up during Z moves following X moves (such as for Z hopping) due to the wrenching action of the extruder inertia. The proportions I’m seeing here are way outside the standard guidelines for overhung arm length vs bearing spacing. I’m sorry to say it, but there are some really, really good reason why you rarely see XZY serial arms like this being used for 3d printing. You could consider adding a second XZ stage on the front side, that would help enormously.
@Ryan_Carlyle Stop saying anything critical about this wonderfull engineered piece of hardware. You might end up being a fkn douchebag like I did…
@Ryan_Carlyle its a modified igus rail, yes. I hear you out and you do have several points in your argument. these are pretty much the same arguments that I have faced myself while building this thing. So far I have sorted all of them one by one to the point where i am satisfied with the analysis that is done on the mechanics itself when intended movement is used. There is probably more problems running up on me as the project goes, and I’m well known that there is very few (near none?) designs that looks like this in this perticular forum, and that is just a part of the challenge.
@Niklas_Smth Don’t act your shoe size. @Rene_Jurack is not a douchebag, but someone with a lot of knowledge about engineering, and even if he was a douche, this is not the place to call him that. If you realy think you can abuse people like that here, you can go and grow nice warts in unseen places for all I care.
BTW, nice looking printer, though I doubt it will produce good prints.
@Niklas_Smth there are other mechanical reasons why this architecture is not used. Your main problem probably will be armonic, amplified by the operating speed. and your end effector will suffer more than usual printers not only because of the isostatic architecture, but also because of the bigger-than-usual axes length.
Then, since there is an extruder that is at relatively high temperature, and again because of the axis size and because your axes are of aluminium, for particular printing jobs you will suffer also from thermal gradient in an architecture that has absolutely no thermal compensation.
At those you should add what pointed out by @Rene_Jurack . The worst of the combination of this issues is that cannot be solved software side, and will force you to do very complex calibration of your machine every time you need to print, without reaching an acceptable printing result. That is why it was suggested to make your architecture stiffer (move natural frequency up, reduce temperature effect, reduce deformational effects).
Fully agreed with @Rene_Jurack , that long extension is going to ring like crazy on any but the most careful X moves, especially near X min and Z max. No realistic amount of stiffness in the Z beam can fix that, so you’ve actually put much tighter limitations wrt. print size on your machine than any other design.
Yes. Just to be clear @Thomas_Sanladerer , for increasing stiffness I mean adding a counter axis on the free side of the beam… like @Rene_Jurack said