Very neatby cristian - General New Machines Topics
QuoteEdvardas Have you considered a material to make a bed platform of? I tried to google hoping to find plenty of information on people using all kind of different materials on cartesian printers to lighten Y axis but came with nothing. Aluminium-foam sandwich (dibond) came to my mind as it is light and stiff. For a first prototype, I was thinking to stick to a classical cold glass bed. More idby cristian - CoreXY Machines
QuoteJ-Max A DLP printer (resin printer with video projector instead of SLA -laser) can be achieved at reasonable price, because there's only one axis, one guide. You just need to find one way to project any UV image. There's a lot of inexpensive examples on the DIY community. Definitely, for jewelry or precision figurines, you want a resin printer. I think you are right. Thanks for the link, Iby cristian - CoreXY Machines
Quotebonmotwang Yes, it gives all the deformation by colors. Not the master yet. I saw the pictures online indeed. I am really envious...by cristian - CoreXY Machines
The advantage of linear compensation is that you can still consider your bed as a flat plane. If it is not flat, the only way I can think a non linear compensation is that you first build a flat raft following the curved surface of the bed, then you print the object on top of it. Doing it is of course possible, I don't know however how reasonable it would be: if the bed is "almost flat", you canby cristian - General
I always keep a spare RAMPS (actually, a spare of everything) to check...by cristian - Printing
Quotebonmotwang With the deflection simulator, even by using 4040 aluminum profile, there is about 0.13mm deflection in the middle. But if the XY frame is assembled with the whole frame, the deflection become 0.0275mm. Are you doing these calculations with Solidworks? I am so envious!by cristian - CoreXY Machines
Quotedc42 I have no experience of CoreXY designs, but I am guessing that stretch in the long belts may be a limiting factor. If it isn't, or it can be overcome, then I think you should be able to achieve better than 50um resolution (but not accuracy) in the XY plane. You may need to use 0.9deg/step motors to get higher incremental torque, and small enough pulleys to get a high steps/mm factor. Bby cristian - CoreXY Machines
QuoteJ-Max You can't reach your model's dimensions within 10µ with a FDM printer. I am becoming aware of that... QuoteJ-Max It's not depending of the mecanics, but of the fused filament technology itself. There's an aleatory factor with fused filament. You need to squeege the filament on the previous layer to make a good bond. So, if you have a 250µ nozzle maybe your filament path will be +-2by cristian - CoreXY Machines
Quotecristian QuoteJ-Max A single 300mm C0 ballscrew is more expensive than most of the reprap kits. If it worked well, the price may even be fine with me After seeing the price for a preloaded C3 ball screw from Misumi I am no longer so sure that it is fine...by cristian - CoreXY Machines
Quotedc42 You can often get better resolution than 150um in the Z direction from an FDM printer, but not usually in the X and Y directions, because the extrusion width is typically about 400um. The problem for me is not just the resolution. It is true that details smaller than 400µ cannot be printed with a standard nozzle, but if the positioning system allowed a precision of 10µ along X and Y, tby cristian - CoreXY Machines
QuoteJ-Max Christian, you can't reach a 10µ precision with any FDM printer IMHO. The best you can expect is +-150µ. You'd rather look at SLA or DLP printers. Okay, now I am starting to understand what you expect from a fdm printer and why belts are fine in your opinion. I think that in some cases repeatability can be better than 150µ, otherwise nobody may really get good perimeters at 200µ layerby cristian - CoreXY Machines
QuoteJ-Max Christian, what precision would you expect ? For my needs, accuracy is probably not as important as precision, reason why aluminium profiles may work for me as well. On the horizontal plane, I would like to print reliably at 0.25 mm layer width, while vertically I would like to reach 0.05 mm layer height, which is the main limiting factor. I guess I am looking for precision in the 10by cristian - CoreXY Machines
Quoterowow As you can see nichrome wire heats up much faster because of its high resistance Air has much higher resistance than nichrome. Oh wait, so if I detach the wires from the radiator I will have house heating almost for free! That's how I'll get rich, after failing with perpetual motion.by cristian - Mechanics
QuoteJ-Max Un nordiste... Bon, on te garde quand même... ^^ Les Chti sont sympa, oui, mais moi, je suis pas Chti, je suis Italien ! QuoteJ-Max Christian, don't be affraid about the belts. Belts are not elastic stuff. Stretch values of 0,4% max are in extreme issues, just before beaking. Then I guess the belts of my printer are quite low quality: I can easily stretch them about 1.5% and I am fby cristian - CoreXY Machines
Yes I live in Lille, France. I know www.dold-mechatronik.de as a partner of motedis.fr, they both look interesting but I get stuck on dold-mechatronik because of the language (google translate does not help much because you cannot really click and see details of the objects or your cart...). The "cheapest" preloaded guides that I found are Misumi's, which are of course not cheap at all but mayby cristian - CoreXY Machines
I would like to start with 2 extruders. Maybe that will be enough already, maybe not, depending also on the effort needed for their calibration, how well multi-"color" printing will work (although I am not really interested in "colors" as much as in mixing different materials), etc. The whole idea was that if the bed is light enough one may get all the advantages of a (multiextruder) corexy systby cristian - CoreXY Machines
Not yet started the build, I purchased a cheap linear guide, my first dial indicator, a scale (the third one...) and I am getting ready to take all the measurements to decide what hardware should be used to get the precision I want (small printer ==> high precision). I will first make some measurements to choose between spectra line and timing belts (and in the case of belts, which ones). Thenby cristian - CoreXY Machines
I usually print at very high temperatures (ESUN PLA does not stick well otherwise) and slowly (my printer has a weak structure), and that pattern is definitely very, very common in my prints. I enjoy observing it while it grows. It is easy to remove anyway. I saw it occasionally online on pictures of other printers. Reducing temperature, increasing speed of non-printing moves and increasing retrby cristian - Printing
QuoteVDX ... you can wind a string around, measure the pulling force ... and calculate the effective g-cm value with the radius ... As it is written, this is what I would do to measure the friction in the absence of load. Doing it under load requires probably a more complicated system (something like this for example, where the friction is given by the difference of M1 and M2) but maybe somebodyby cristian - Mechanics
I have some cheap Chinese ball bearings that I would like to use for a corexy system. While they seem to roll smoothly, I would like to get an idea of their friction torque under different loads. Has anybody tried to measure bearings friction "at home" already? I have a couple of ideas about how to do it, but any previous experience would be welcome.by cristian - Mechanics
If your expect from plastic performances comparable to metal you will probably be always disappointed: I don't think you can do more than prototypes (read: toys), at least for moving parts. In any case you should probably have a look at self-lubricating filaments such as nylon or iglidur.by cristian - Reprappers
This is probably no longer of interest for you, but maybe for future readers: I bought a cheap MAX6675 module + thermocouple from Ebay last Spring and I got it immediately working on RAMPS1.4 + Marlin firmware by following this tutorial.by cristian - General
You can set different width for infill and perimeters, and use one hotend for the infill and the other for the perimeters, for example. See here. You can also infill every N layers instead of doing it every layer, see here. I forgot to say that this is probably not the right forum section for this question, although the name of the forum is misleading somehow.by cristian - Plastic Extruder Working Group
Quotegmh39 Based on the drawing you posted, the carriage would move faster at the bottom of it's movement and slower at the top because the angle that the spectra line makes with vertical does not stay the same. In my experience this is false, unless you break one or more conditions that are somehow implicit in the picture (the wire must not be too thick, it must stay on the same side w.r.t. thby cristian - CoreXY Machines
Quotegmh39 That would cause the z axis to move a different rate as it moves along the axis. In the particular setup shown in the picture, no.by cristian - CoreXY Machines
Quotecozmicray If the line wraps on itself the shaft radius changes -- changing Z lift per step Since your talking microns overwrap is a lot? You need to use a screw or winding mechanism to keep line flat? Thanks to a little geometrical trick, it is possible not to use screws or other winding mechanism to avoid line wrapping on itself. You just need a stepper motor spinning a round shaft, and aby cristian - CoreXY Machines
QuoteLarsK I am not saying that direct spectra (1:1) wont work. It worked for Cristian - But I would probably make some good tests, as you already mentioned you want to. In my case, it is (2:1) calculated on the motor shaft (2 motor steps lift or lower Z by the length of one step, where a full circle is motor_shaft_diameter * pi), otherwise the carriage would fall down when the motor is turnedby cristian - CoreXY Machines
QuoteLarsK Imagine if you put a stepper on that spectra wire and then you can just remove the ball screw completely. Never tried anything like it but would be really interesting. Ball screws are really what kicks the printer costs up. I use some cheap spectra line for the Z axis of my smartrap: no wobble, almost zero cost, Z resolution of about 50 microns per full step. That is one problem thatby cristian - CoreXY Machines
The most expensive plastic vase I have ever seen. I have a short sample of PEEK filament, I am looking forward to trying it. Does the extrusion work well? Did you notice any issues, such as delamination, filament break, slipping, ...?by cristian - Polymer Working Group