Less than two weeks, I read. Good luck with your work!by cristian - Look what I made!
QuoteVDX I've managed to get positioning resolutions and accuracies of sub-microns with printed and/or milled parts, where the accuracy of the printer was in the 0.05mm and of the CNC-mill in the 0.0125mm I have never dreamed about such an accuracy. May you comment a bit more on this, that is how you designed the printer and how you measured sub-micron accuracy? I wouldn't even know how to measuby cristian - Mechanics
Looking forward to watching its first prints. It must be a huge machine...by cristian - Look what I made!
Would these artifacts increase or become reasonably stable generation after generation, if a Snappy printer had to print a second Snappy printer, and this one printed another one, and so on?by cristian - Developers
Tu as déjà acheté ?by cristian - RepRap Groupe d'Utilisateurs Francophone
Thanks for the info! Since the parts to print are not so thick, you may try printing ABS on cold bed with no risk of delamination. I have never tried that, but I managed to print Colorfabb XT (a kind of PETG filament, if I remember well) on cold glass with PVA glue, which is less brittle than PLA, and really hard to break. By the way, Colorfabb PLA/PHA filaments are also infinitely less brittleby cristian - Look what I made!
You may also try with a different plastic (I don't know which one you are currently using). I have never built such a thing before, but it looks really cool. Where did you get all the components? I have seen on Ebay and Aliexpress that there are motors and many other parts.by cristian - Look what I made!
Cool! I wish I had such green and empty surroundings here too.by cristian - Look what I made!
5/8" aluminium rods 24" long (that don't give you a 24" cube build volume, but less) should be roughly equivalent to 0.48" steel rods with respect to deflection calculated for supported ends, if wikipedia Young's moduli are correct in your case. It depends of course on many factors, including how they are attached to the structure, but I would bet that even ignoring all the other factors affectinby cristian - General
A little update: here are small rings (lazily polished) made of Colorfabb's brassfill and copperfill (and bronzefill that was reviewed already) that were printed with Reg's Genie hotend without issues: Remarkably, the copperfill filament can be difficult to print because of the friction with PTFE liners in some hotend designs. The Genie hotend has a PTFE liner but gave no problem even at low vby cristian - Smart_Rap
That would be less than 150g (excluding silicone and other supports), which would be great. Thanks again!by cristian - General
They don't sell to private individuals?! Very bad news...by cristian - General
That may be an option too, yes. I wish they specified clearances and deflection in every product... Now I bought a cheap linear guide like this one to get familiar with this kind of linear motion system and to measure the play of this low end stuff. I will post the results as soon as I receive it.by cristian - Extruded Aluminum Frames
I have never used a heated bed, so here is a newbie question: would you use something like this to heat a small aluminium bed about 100x100mm? In that case, what would be a safe minimal thickness for the aluminium plate to spread heat sufficiently evenly and to be and stay flat, in your experience?by cristian - General
Motedis ships to most EU countries and has a good reputation for aluminium profile cut to length and other CNC/3D printer parts. I have not tried it yet but I will do it soon.by cristian - General
In the end I will probably build a much smaller printer, but in any case I will do some deflection tests with a dial test indicator to see if the frame is stiff enough. Thanks for your suggestions!by cristian - Extruded Aluminum Frames
After finding the formulas for the tolerances and those to calculate the order of magnitude of the life of linear guides (for example these), I feel no longer so "lost" and I think this is really the right way to go. I can't actually remember why I wanted to use smooth rods in the first place. Many thanks J-Max and LarsK for your suggestions, they have been illuminating.by cristian - CoreXY Machines
Thanks. I think I will start with the cheapest ones too, so I won't cry too much if I ruin them.by cristian - CoreXY Machines
Quotepatrickrio I sourced the linear guides from AliExpress. Search for Hiwin or Linear Guides and all the sources show up. Thanks, I was in particular curious to know the price range you chose for your linear guides. On aliexpress there are cheap (from few dollars) but also very expensive linear guides, inlcluding Hiwin. The video is well done and the prints seem fine. I think I saw the bed flby cristian - CoreXY Machines
Quotepatrickrio (why mess up sizing during prototype design with expensive slides... use the cheap ones first I say...) This is actually a very good thought I missed. It may be worth starting "cheap" with some Chinese guides and then buy the serious ones when the design is stable. Which rails did you buy and where? I had a look at the threads you linked but I missed the post where you say whereby cristian - CoreXY Machines
Quotepatrickrio I suspect that environmental dust and lubrication will be the real limiting factors, but as I said, we will see!!! I am testing!!! Thanks for sharing your experience. After several informed advices that I received in this forum section I am also planning to use linear guides for a coreXY, so I am very interested in your build.by cristian - CoreXY Machines
Quotecristian What is the formula to calculate their life given the load? Found an example of formula here.by cristian - CoreXY Machines
Quotepatrickrio The expected durability is supposed to be more than 100km of movement if kept correctly lubricated. 100km seems very little, I was not aware of such a short life of linear guides. Even supposing a low average printing speed, let us say 10mm/s, divided by the two available directions X and Y (Z is negligible, and this is anyway an unrealistic optimal case just to obtain an upperby cristian - CoreXY Machines
It looks very interesting. May you post pictures of some prints? What do you think about linear guides after trying them?by cristian - CoreXY Machines
QuoteJ-Max Seems like you need manufacturer's data to make up your mind. So just ask your provider or a manufacturer. Definitely, provided that one buys from a serious manifacturer. It should also be possible to some extent to measure the reliability of the coreXY system in almost static conditions for small distances, such as one or a few motor steps. It would also be interesting to see how thby cristian - CoreXY Machines
QuoteJ-Max Forget theory a minute, get that small aluminium extrusion in hand, feel it, measure by yourself. I don't own any 20x20 profile (or any other size, yet), nor a precise measuring device (yet) so I cannot do that now. I will measure deflections by myself as soon as I get everything I need, I am looking forward to that. If you own a precise measuring device, it would be great if you mayby cristian - CoreXY Machines
QuoteJ-Max christian, the Corexy belt system is a push-pull loop transmission. What you could lose at a end will be compensaded at the other end. Movements are assumed simulteaneously by 2 belts too. There's max extension values for each belt, that's true. But, that does not means a belt is so flexible. That value is max extension before the belt brakes. That means you should overtake the admby cristian - CoreXY Machines
QuoteJ-Max Misumi is a serious brand too. Actualy, it's more expensive than Hiwin for the same quality. Look at Hiwin documentation on their website, you'll get the same kind of informations. Misumi website provides online configuration and direct sell, apparently. I am not aware of Hiwin resellers, I found products online here and there but it is difficult to find the exact product I want. Quoby cristian - CoreXY Machines
Here are some very interesting data about clearances and accuracies for Misumi linear guides.by cristian - CoreXY Machines