TDD is right, tossing the print bed back and forth in the Y axis is pretty iffy and creates a bigger trade off in print speed vs print quality. A moving bed in Z is effectively stationary during the print and will not affect print quality unless you decide to use software z compensation, then you might end up with extra vibration from the bed moving up and down during the layer. The cr-10, tornby Trakyan - Reprappers
Round tubes are a bit more forgiving in terms of wonky assembly which is I think why they're used. If a part is twisted a little (or even the tubing is twisted, which I've seen before), a circle still the same circle, not so much with squares. Another thing is you'd need more bearings. A round tube can be properly constrained with three radially spaced bearings, square tube needs four. Again theby Trakyan - General New Machines Topics
You could use open loop control as long as you have an accurate resin dispensing system and a consistent cross section of your vat.by Trakyan - General
A kossel is a delta, similar to how the prusa is a mendel style printer, etc.by Trakyan - Reprappers
Ahh, I was picturing a coffee table sized zen garden.by Trakyan - Reprappers
Sounds like something overheated on the ramps there. I'm not the best person to ask but I'd have to guess there was a short somewhere, possibly the motor coils could be shorted either internally or at the connectors. If swapping the ramps and drivers didn't fix anything check the motor connectors and motors, with a multimeter if you can. Maybe replace the mega and see if that helps? You could aby Trakyan - General
Can't say I've heard of a web based slicer written in java. Now that you mention it though, I've had trouble connecting my printer to cura through usb. That being said I'm inclined to believe it's an issue with the printer since its very particular about what order I plug in and turn everything on even when I'm using repetier host. EDIT: this reminds me, has anyone tried iceSL? It's a slicer wiby Trakyan - General
My printer has fans that run when the board is hooked up to usb, that's normal. Not sure why your psu fan is running from usb though. I couldn't understand much of what you said, can you tell us exactly what is and isn't working right now. As for burning out the motors, I find that unlikely, they're probably the most bulletproof part of any printer.by Trakyan - General
Pointing out flaws is fine, but a number of these are compromises I made deliberately so that I could afford to build the machine (eventually). Besides, most of the comments aren't pointing out the flaws they're just plain snarky. QuoteMKSA So any progress about these cheap CNC, 3D printer kit designs, surveys etc ??? I'd expect this sort of attitude if I was telling everyone to throw out their cby Trakyan - General
A bed level sensor will only perform as good as you set it up and calibrate it, it's not a way to solve bed level issues, it's a convenience item, not a problem solving one. I don't use bed level sensors and my bed level is just fine. I'd suggest getting a flat print bed if yours isn't flat, and using a three point leveling system. Not only does it avoid twisting the bed, I also find it quicker aby Trakyan - Mechanics
It's the fact its a extremely cheap component, not a safety feature. A safety feature would be the motor stalling before anything gets damaged. In my experience that slipping will lead to broken gear teeth if it hasn't already, the gears in those motors have pretty weak teeth in my experience. It's not a bad batch, that's just the specs of the motor, they're all like that. I don't think backlashby Trakyan - Reprappers
First tell us what problems you're trying to address, I don't personally see a point in upgrading the hotend/motors/etc. if the current setup works unless you've got a specific issue you want to sort out. Something like the heatbed not hitting the target temp or taking forever to do so, bearings jamming or making more noise than you're comfortable with and so on.by Trakyan - Mechanics
That's assuming safety features are enabled. But yeah, from my experience high temps are usually a short, check the insulation goes right up to the bead and the set screw if that's how its attached isn't too tight.by Trakyan - Reprappers
What temperature is your thermistor showing? Also, you may have inadvertantly broken the heater cartridge, those wires dont like being handled much and break easily in my experience.by Trakyan - Reprappers
Does the extruder motor turn/move at all with no load on it? If not you might have a faulty driver or loose connection. Otherwise you might have too much/little idler tension.by Trakyan - Reprappers
you could try an etch a sketch like setup and replace the crossing bars with some tensioned strings. Yes, the motion would be sloppy, but let me assure you that's a 'motion smoothing' feature for extra zen-ness :pby Trakyan - Reprappers
I run 2.x on my 32 bit laptop and dont have any severe load time issues. A couple of minutes at most but I have an overworked netbook. Kudos to the dev, this is a feature I hear a lot of people asking for and seems to be the only thing I hear about S3D. I personally loathe supports and go to ridiculous lengths to avoid them so its not a big feature for me but I do love stuff like adaptive layer hby Trakyan - General
QuoteMechaBits Men aren't particularly agreeable...so dont worry about it, but after doing all the work to make it parametric, there really needs to be one made before you'll get enough interest in it, did you design it around a particular router/spindle? ie a small one 400w or smaller? I get that, and I'm not expecting a huge amount of interest in what is basically just an idea right now. The 'by Trakyan - General
Am I behind on my quota? This is a hobby project, I have other things I need to prioritize, bills to pay etc. If you want to see the machine completed asap feel free to print the parts yourself, I'll help you where I can. I don't see why you're acting so snarky.by Trakyan - General
thought i mentioned it somewhere, the design is complete and published. Github under bevelcnc, ive got some things to commit tomorrow (mostly stuff to reduce print time and material use). i havent printed anything yet for three reasons: ive had exams and two jobs to deal with up until last week (still have the jobs luckily), i decided to try and implement a remote string driven z axis over the thby Trakyan - General
@o_lampe, neither of those are cartesian. I don't know what to call it but it uses pythagoras. Also, near as I can tell, using two springs does nothing but slightly shrink your work envelope. If you want a square working area just replace one of the springs in the dual spring diagram with a third motor. if you want a round work envelope then really only your original solution will work out ofby Trakyan - Reprappers
True, since the extra string to fully constrain things is only really there to keep the others in tension, it can be replaced by a spring. A constant force spring would be ideal, they have a constant force and usually have a relatively long stroke (plenty for anything desktop sized). Best part is you can get them for cheap by gutting a tape measure, just be careful when doing so.by Trakyan - Reprappers
The string driven version would have 3 motors, each positioned 120 degrees apart, each one has a spool of string which goes to the effector. The hangprinter does have a fourth motor, but that because it needs something to keep the other 3 strings in tension. Here the effector is held against the table/they are all in one plane and the three lines are sufficient to keep things in tension. With strby Trakyan - Reprappers
The configuration you've got is entirely polar, it requires just trig functions (inverse trig for the inverse kinematics, which is what you want). Delta printers use no trig functions, instead they use squares/square roots. The two equations you'll want to solve are more or less atan((x-x0)/(y-y0)) for your polar version, where x-x0 and y-y0 are the difference between your desired x/y position aby Trakyan - Reprappers
In terms of accuracy you'll only be as good as your weakest link, but I think you're right about three motors helping with torque. I still see torque being an issue but the only way to know is testing. EDIT: I'm not sure if its about the clock speed, but from what I've heard trig is more computationally intensive then squares/squareroots.by Trakyan - Reprappers
o_lampe is right, changing the y steps/mm each layer and giving the part a taper should work I think. It's a bit complex with so many changing variables so testing might be the simplest and most fool proof way to determine.by Trakyan - Reprappers
I think it's something the slicer rather than the part itself needs to compensate for. There no real way to compensate for the perimeter placement in the design other this other than having perimeters only perpendicular to the rotary axis (next to impossible).by Trakyan - Reprappers
Out of curiosity, are you doing anything to compensate for the fact that as you go further out (z axis goes up) the circumference increases? If you slicer is assuming its constant then you'd end up under extruding and the gaps between extrusion lines that aren't perpendicular to the rotation axis will get bigger which I think I can see happening in the pictures. Otherwise awesome build. A quickby Trakyan - Reprappers
Not to bash (I like the idea, actually have plans to make something similar in the future as a glass top coffee table), just a few things to note. Those are some big levers on the motors, when the ball is further away from the motor I imagine the tiny steppers you plan to use will struggle. Having used them before, I actually have trouble believing they can handle the lever/guide things if they aby Trakyan - Reprappers
Both my printers have the heater/thermistor/extruder stepper bundled right next to each other in a single cable wrap with no particular precautions taken to prevent noise issues, so far no noticeable noise problems. As for running two fans off one connector on the ramps, I'd say it depends on the fan. That being said, I see no reason why the heat sink fan can't be connected straight to the powerby Trakyan - Reprappers