Both of your problems look like a microstepping issue - printer is running at full steps but DEFAULT_AXIS_STEPS_PER_UNIT are set for 1/16 microstepping. On your main board under each stepper driver there are jumper pins. You have to put jumpers on those pins to set correct microstepping.by piper3d - General
QuoteMKSA I was referring to all the adjustments you mentioned you have to do after moving your printer a few fractions of a furlong. I was referring to 8 cubic meter 3d printers built by my friend QuoteMKSA If there are bearings that don't touch the tube, then they are of no use. In fact half of the Z bearing assemblies (which are not very rigid and luckily as the system would bind), half of thby piper3d - CoreXY Machines
QuoteJoergS5 Have you found the idea of diagonal struts by chance or by mathematical calculation? It was more by intuition. QuoteJoergS5I am still searching for a good freeware simulation program to optimize struts construction, especially in respect of vibration effects (how to minimize stepper vibrations e.g.). The program Z88 is a good program in this direction, but has still some limitationsby piper3d - CoreXY Machines
QuoteJoergS5 Your extrusion construction of the diagonal struts reminds me of the geodesic dome. This may be a reason for your good print results. Thank you. You may check my Piper 1 this is where it first appeared.by piper3d - CoreXY Machines
Quotethe_digital_dentist Eliminating adjustments is an achievable goal, just not the way you're building the printers. TLDR: it isn't impossible to eliminate adjustments, but I don't think you can do it if you use printed plastic joints in the frame structure, motor mounts, linear bearings, etc. I may argue that Airwolf or Ultimaker have printed or plastic parts in them. Prusa is printed and coby piper3d - CoreXY Machines
QuoteMKSA If your machine requires frequent adjustments, it is normal due to the way it is built. Looking at just the Z axis; 4 lead screws, 4 guides and many bearings ... the assembly must be flexible as there is NO WAY to align all this perfectly thus a rigid set up would irremediably bind. Even, I wonder how many bearings are really bearing ! Anyway. It does not require frequent adjustments, oby piper3d - CoreXY Machines
So I've been visiting multi extruder for Ramps 1.4 page (https://reprap.org/wiki/Adding_more_extruders) for quite some time (just browsing). And then I faced the challenge: How synchronously, reliably, and on a budget control 4 Z motors of my printer. I did try serial and partial serial (2 parallel pairs of 2 motors in series) connections - they work even with 12V PSU, but I had this idea that itby piper3d - Controllers
NASA??? How many flights they delayed or even Space X And the best engineers may be already working on the next Mars rocket for Ilon We just need to create simple 3D printers to build houses on Mars.by piper3d - CoreXY Machines
Quotebbcbggr54 So i have these 3 Z designs to choose from unless someone else has something better. I believe that the simplest design you may choose will be 3 motors Z. Belts look nice but they add an additional constraint to the design - belt length. Since it is closed loop belt redesigning your printer for a different size will be challenging. In 2 years your belt will wear out and boom nobodby piper3d - CoreXY Machines
QuoteMKSA built with the proper components, you don't even need z-probing/auto bed leveling. Your statement is a good but unreachable goal. If you move your machine, no matter how good and rigid it is, you do. My friend is building industrial 3, 5, and 8 cubic meters printers from all the best components and huge extrusions with stress analysis and so on, imagine of moving that monster few inchesby piper3d - CoreXY Machines
QuoteNathanaelXYZ If the four motors are controlled independently, then the system actually has the benefit of being able to de-rack the gantry automatically based on z-probing. Nathanael, Thank you for the idea.by piper3d - CoreXY Machines
the_digital_dentist, you have some epic job documented in this thread. Multiple innovative solutions. People may read it as a book on how to design your own printer. Congratulations on a great job!by piper3d - CoreXY Machines
Quotethe_digital_dentistDoes it matter? Not that I can tell. If you will expand your printer to have a 1mx1m print bed you will start seeing those forces. If you will try running your printer at speeds 400mm/s+ and acceleration 5000mm/s2+ you will see the influence. The same applies to my machine - I do not see those torque forces while printing at 300mm/s, but I do know they exist (reposting froby piper3d - CoreXY Machines
If you are trying to show design I used, the downside is rotating forces around Y axis of X carriage see above . Quotethe_digital_dentist You will eliminate torque about the Z axis, but you'll still have rotational torque about the Y axis because the belts will be attaching to the extruder carriage with vertical separation on both sides of the carriage. It is all a trade-off. What I like about mby piper3d - CoreXY Machines
if you have a structure like the grey outline and apply forces to short ends - blue and green, they will result in bending force - orange. Resulting forces will be applied perpendicular to X with rotation around Y (corners).by piper3d - CoreXY Machines
Quotethe_digital_dentist This pretty much explains Y axis stability: Rotate your drawing plane 90 degrees around X and look at XZ plane.by piper3d - CoreXY Machines
QuoteJoergS5 piper3d, I found some interesting discussion in a cnc forum about stabilizing XY: This an interesting idea. Thank you for sharing.by piper3d - CoreXY Machines
Quotethe_digital_dentist You could build a corexy mechanism with the belts on the same Z level, crossing them at the back and twisting them so the smooth back sides rub against each other, then bring the belts to the extruder carriage at the same Z level (back to back and just touching) and almost completely eliminate all the torque on the extruder carriage. In addition to the stability of X carrby piper3d - CoreXY Machines
Not very good picture I hope the concept will be explained. Delta Z1 and delta Z2 are equal. The middle line is the movement plane. If belts will be on the same side of XY movement plane and aligned like in your second example top belt will have longer "lever" then the bottom belt.by piper3d - CoreXY Machines
You will either have rotation forces in XY plane or rotation forces in XZ. In my printer, they are in XZ plane - like your example 2. I also connect belts symmetrical to XY plane, so 1 belt moves above XY another bellow to avoid the difference in "levers" lengths.by piper3d - CoreXY Machines
Have a video of 300 mm/s run https://youtu.be/D-Es5PkO1gkby piper3d - CoreXY Machines
My coreXY design does not have EMT conduits in the gantry only on Z . Published it in CoreXY forum. (Sorry for responding late was busy preparing release of Piper 2)by piper3d - General New Machines Topics
Yesterday have run a test on 300mm cube Piper 2 printing at 300mm/s. I printed walls of 200mm cube, 3 perimeters for a single layer have completed in 9 seconds (average speed 267 mm/s). Printers mechanics were able to run the head at the speed 300mm/s, but extruder has failed to melt the plastic with appropriate speed to keep up. Bellow is a fragment of the print. Corners look fine due to accelerby piper3d - CoreXY Machines
Quoteo_lampe I don't fully agree with the statement' moved wires will eventually break' from the video. And I am not trying to force . The exact quote from the video "eventually break", 100,000 moves are fitting into "eventually" range . Before adding high voltage heating bed the only risky point for high voltage are PSU and connection to the outlet. With the addition of the high voltage bed,by piper3d - CoreXY Machines
QuoteNathanaelXYZ I was imprecise in my comment-- I am imagining twisting forces around the x-axis that would skew the parallel x-rods out of plane with each other. I started feeling that a little today. I had pushed Piper 2 to the limit and somewhere around 230 mm/s after 3 layers it started drugging the previous layer and messed up print, I think it may be a reason. (Jerk =7, acceleration 200by piper3d - CoreXY Machines
In this video by Matt Snow from about 7ths minute this printer is shown .by piper3d - CoreXY Machines
Those things, except music box, were printed on Piper 2 That egg - fire track btw has rotating wheels. The message I am trying to deliver is that you do not need a hell of precision building 3d printers, but precision which is just "enough". I have friends who already spent close to $1.7K building 1 printer out of the best parts they can find. Piper 1 cost me $180 and Piper 2 close to $240 outby piper3d - CoreXY Machines
Quoteo_lampe ... and machined extrusions suddenly look much more appealing. Olaf 90% agree, you will add shipping costs and find that you do not need extrusions or pipes and you are building boxes out of 6mm acrylic But the best way is to sell parts as printers. Please remember that I do have 2 of those machines already one is 300mm cube another is 250x250x300mm and it is not a hell to align theby piper3d - CoreXY Machines
QuoteQdeathstarBut, i like the idea. . Thank you QuoteQdeathstar It is as important to cut the pipe precisely as it is to cut extrusion precisely.... . Unfortunately you may cut, without special equipment, something with the tolerance of 1-2mm. It is acceptable for this printer, but it would not be acceptable for extrusions fitting.by piper3d - CoreXY Machines
QuoteNathanaelXYZI'm not entirely convinced (yet) on conduit framing, but kudos on the design and execution. Thank you, Nathanael. Conduit design is at least 10 times cheaper than extrusion design, to some extent easier to work with and I am not expecting that it will be precisely cut. Extrusion design on other hand do require precise cutting in the shop rother than at home. QuoteNathanaelXYZby piper3d - CoreXY Machines