Love the fact of reach high temp on the chamber.
Noticed in some prints that the chamber reach 66-67ºC very fast at the beggining and later reduces a bit when the bed it's lowering.
Trying one object that in other life I printed on my voron trident with a powerful bed.
nozzle: Phaetus 0.6mm SIC
Layer height: 0.25mm
profile: Structural
Material: ASA
Sheet: SATIN + Gluestick
22h print, ASA, custom 0,6mm height skirt, custom supports on the low secction to support the piece.
Still atached 🙂
RE: Love the fact of reach high temp on the chamber.
The print seems to be ruined.... the printer lost steps or something at high height.......
RE: Love the fact of reach high temp on the chamber.
Yeah, confirmed, Z steppers are skiping steps 🙁
RE: Love the fact of reach high temp on the chamber.
Yeah, confirmed, Z steppers are skiping steps 🙁
Darn... Did you lubricate the Z lead screws? While the trapezoidal nuts should be self-lubricating (POM), several users have observed nasty noises and/or sporadic blocking of the Z drive, which went away after lubrication.
Also, I recommend re-seating the trapezoidal nuts, to make sure their lateral position complies with the position determined by the smooth rods: Drive the bed all the way down, loosen the 3 * 2 screws which hold the trapezoidal nuts (so the nuts can move laterally), gradually re-tighten the screws.
Prusa's assembly procedure has the nuts mounted first, then the smooth rods forced in later. This may lead to strain in the Z drive which gets worse the further the bed moves down -- which seems to be where you ran into difficulties. (Higher up, the Z lead screws can tilt to compensate for incorrect positioning of the nuts. The stepper motors below the base plate are mounted on flex joints for that purpose.)
RE: Love the fact of reach high temp on the chamber.
Yes, I noticed these when was assembling my kit.
The Z drive it's not completely alligned.... and I don't know how can happen that, because the steppers are mounted on the metal sheet and not permit any movement, they have very thight tolerances. But the flex joint appears not to be sufficient.
I prefer far away the voron system that my trident has. At least in front steppers that have smooth rod...
I wrote support telling this...
Yeah, confirmed, Z steppers are skiping steps 🙁
Darn... Did you lubricate the Z lead screws? While the trapezoidal nuts should be self-lubricating (POM), several users have observed nasty noises and/or sporadic blocking of the Z drive, which went away after lubrication.
Also, I recommend re-seating the trapezoidal nuts, to make sure their lateral position complies with the position determined by the smooth rods: Drive the bed all the way down, loosen the 3 * 2 screws which hold the trapezoidal nuts (so the nuts can move laterally), gradually re-tighten the screws.
Prusa's assembly procedure has the nuts mounted first, then the smooth rods forced in later. This may lead to strain in the Z drive which gets worse the further the bed moves down -- which seems to be where you ran into difficulties. (Higher up, the Z lead screws can tilt to compensate for incorrect positioning of the nuts. The stepper motors below the base plate are mounted on flex joints for that purpose.)
RE: Love the fact of reach high temp on the chamber.
The Z drive it's not completely alligned.... and I don't know how can happen that, because the steppers are mounted on the metal sheet and not permit any movement, they have very thight tolerances. But the flex joint appears not to be sufficient.
The Z lead screws and rods are over-constrained in two ways. I think you can largely account for both of them with the available screw hole tolerances, but not quite:
(a) The distance of the smooth rods is defined by their mounts in the base plate and in the CoreXY frame. There is no tolerance or adjustment in the base plate. But you can loosen the screws which attach the "bed mount" parts to the bed, to ensure that the distance of the linear bearings matches the rod distance.
But unfortunately I don't see a way to adjust the distance of the two rods on their upper end, to ensure the rods are perfectly parallel. The screws which hold the upper rod mounts in place are no longer accessible once the CoreXY assembly is installed on the base. I think one has to rely on assembly tolerances that the two rods are reasonably parallel, and am not happy with that. The "bed mounts" (installed in steps 4.15 and onwards) seem to be designed with a bit of flex in them, but I don't see how that can accommodate a varying distance between the smooth rods.
(b) The lead screws also need to match the position defined by the smooth rods. As described in the prior post, that should be achievable nicely by letting the trapezoidal nuts settle in the correct positions.
I have not actually tested how parallel the two Z rods are in my build. It should be possible to loosen the trapezoidal nuts and move them all the way up, then move the bead up and down by hand to check whether it moves smoothly all the way. I'll try that tonight, I think.