![hypercube printer hypercube printer](https://hardforum.b-cdn.net/data/attachment-files/2018/09/153742_20180903_091620_HDR1.jpg)
not least: specialist parts would have to be designed or sourced which held the (moving) cross-gantry on rails, you would have to perform complex calculations on the length of the cross-member, source special-length rails or rods. Not least, such a design would have one major significant disadvantage over a CoreXY which *did* have that angle be exactly 90 degrees: it would be wasteful of both materials and space, and would be technically extremely challenging. They are not related, as you can see in the above picture.Īlthough technically you are correct, i cannot imagine that anyone would want to (a) design a CoreXY printer where the angle of the X (blue thick) line was not orthogonal (at right angles to) the Y (red thick) line.such that (b) they had to enter that angle as a parameter into firmware that (c) they had to modify and maintain. You are confusing XY squareness, which is a valid requirement for a standard firmware configuration, but can be corrected in firmware with the actual motion mechanisms. why? because any attempt to move left-right would result in *Y* travel as wellĭo you mean that the positions of the motor gears may be shuffled left or right as long as they are the same distance apart in the X direction, such that all belt sections connected to the two gears remain "parallel"? because that is *exactly* the mistake that is most commonly made on CoreXY designs that results in exactly the type of distortion shown by the OP. Now, do you mean that the horizontal part (the X-gantry) could be at an angle of 45 degrees (and the left and right belt lines still be "parallel")? because whilst that would work it would require a change to the CoreXY firmware to take into account the angle of the X-gantry. but, again, this is not totally relevant, but serves to highlight which are the critical aspects of the CoreXY design and which are not. but it is *not* strictly necessary that they be so.Īlso the exact positions of the top-left-most and top-right-most bearings also need not be critical: they could if you wanted them to be a million miles away (as long as you had 2 million mile long belts). Note that the actual lengths of those belt sections which are touching yellow right-angle markers do not *actually* need to match (left, right, top or bottom), but if you do not match them then obviously the horizontal X-gantry will hit one of the idlers (and not the other), making it pointless *not* to have the lengths the same.
![hypercube printer hypercube printer](https://i.pinimg.com/originals/f2/91/a1/f291a1494893e7456b8c699f7743f914.jpg)
that's not actually true: the additional requirement is that all the idlers for each axis, with the exception of the top-left-most and top-right-most must be in the same Z plane. thus you can see that the use of the word "right-angle" as applied to the eight critical positions is sufficient to unambiguously pin down and specify the degrees of freedom that result in a correct CoreXY implementation. So i've marked in yellow where the right-angles are REQUIRED to be in order to guarantee a correct CoreXY implementation. but the *specific* sole and exclusive use of the word "parallel" is itself ambiguous as its use alone is insufficient to pin down every single degree of freedom in the potential relevant (critical) arrangements of belt, idlers, motor gears and X-gantry. they *happen* to result in the left and right belt lines *being* parallel, and they *happen* to result in the 3 top idlers left and right being directly inline (and the belt coming off the lower idler outer edge being *required* to line up with the motor inner side) such that the vertical lengths of the belts that change must be inline and parallel. would you mind doing a quick sketch? example: i've marked up where i mean that right-angles are required. I'm really sorry sigxcpu, perhaps it is me: i can't understand the words and translate them into images. You need to mount it PARALLEL to the guide. Think of it as a leadscrew because it is easier to picture.
![hypercube printer hypercube printer](https://hardforum.com/data/attachment-files/2018/09/153757_20180903_0916331.jpg)
And they are not at "RIGHT" angles, they are 45 degrees. I can rotate my X axis at 45 degrees relative to Y axis and keeping the belts parallel to their respective moving axis will still work.
![hypercube printer hypercube printer](https://i.pinimg.com/originals/f4/a6/0f/f4a60f4c95d2a2b9eb70df4471ec18e0.jpg)
They must be parallel to the moving axis.