I am trying to print, some Voron 2.4 parts on the X1 Carbon. these contain holes in the vertical and horizontal axis. When printing the vertical holes are fine. But the horizontal holes keep printing an oval, instead of the circular ones that are needed.
I have loosened the x y belts, by undoing the four screws on the back of the printer. Then moving the toolhead all the way to the front and back of the printer as suggested in Bambu’s wiki. But this is not having any affect. Still getting the ovals in the horizontal axis.
The two pictures below The black one is ABS the grey is PLA. Would be grateful for any help in solving this issue.
I have also cleaned the carbon rods with IPA. No change there either.
The Bambu Lab printers are all CoreXY printers. While a part of oval holes is does to the layering itself, on CoreXY there might also be another reason. Belt tension. Unless you have an instrument to measure the frequency of the sound the belts do, you can do some quite good measuring with your ear as well.
On the side of the printer where the long sections of belt are, plug them like a string and check if the sound they make appear to be equal. If not, you would have to follow the belt tensioning procedure.
Thanks for the info on the belt tension. But I have done this about three time now. But still get oval hole instead of circular holes on the horizontal axis. Vertical holes are ok.
My guess is it is because of your layer height. Slice it with a smaller layer height (or adaptive layers which will give you the best circle) and see if produces a more round circle in your preview tab. Depending on the hole location, layer height, and hole size, it can even flatten the top completely. This only affects horizontal holes as you mentioned. This is covered in the video posted above, but if printing a pre-designed print, you might not have the ability to change the hole geometry.
I’m having the same issues. I have retentioned and recalibrated. Printed slower and changed the orientation on the bed. It’s only circles on vertical surfaces.
Vertical perfect circles will always be a limitation for FDM-printers. Horizontal circles don’t really have a resolution limit (ok, besides getting to small). Vertical circles on the other hand have a resolution 0.2 (standard preset) and on the upper end of the circle you will also fight against step overhangs.
Ideally, the design already foreseen the limitation and implement a few design tricks to compensate for this.
I would build a little cube model with a same sized vertical hole and paint supports into the hole. Should not take to do. Maybe you will get lucky and it will work.
Are you sure they specify a 0.4mm layer height? I’m looking at page 4 of the manual and it says 0.2mm height and 0.4mm width. It appears Bambu Studio does allow you to go to 0.4mm thickness, but OrcaSlicer/SF only allows 0.28 max.
I couldn’t find your exact part, but this “z_motor_mount_b_x2.stl” which has a couple horizontal holes. This is what it looks the unsliced part looks like:
As shown above, your 0.4mm layer height is likely the cause of your oval holes. With non-adaptive layers, the slicer is indiscriminate, so you may get a flat top, flat bottom, or sometimes both. It all depends on the diameter of the hole and location relative to the slicing. This is lessened by using a smaller layer height or if you want a really round hole, adaptive layers.
You can set the max layer height in the nozzle settings. You can raise it to 0.4mm there if you like.
But I have no idea what settings you actually need for the print
