The Z-bed supports were a little wide for a good fit to 19mm bearings…sO I made my own. They’re good enough to work and improve bed movement dramatically, but I’ve noticed a behavior on this and prints from other printers…the banding that happens on the layers with bolt holes…what causes this?
I’m also curious as my printer suffers from this… I /suspect/ it’s poor flow restarting following a retract, but I’m unsure how to fix it.
It can be a nozzle catch. Change the holes from circles to hex with the same face-to-face diameter. Then you never run into a greater than 45deg overhang condition so it will be less likely to curl up and catch.
Off to research ‘how to make hex shaped holes’
Not hex holes in your nozzle, holes in your model e.g. using $fn=6 in openscad.
Yeah, I got that…should have appended (‘in Inventor Fusion’) ‘Learn Openscad’ is about 6th on my list of priorities.
I usually orient the peaks so the points run vertically. The reason is otherwise the points along along the layer bands an can be a source of inter layer cracking (failure). This is more of an issue with long abs prints with low perimeter counts.
Eric, I understand what you mean by nozzle catch, but these areas seem to cover the entire diameter of the hole, not just the point at which the overhang angle is greater than 45 degrees.
Mike, I’d be interested if this behavior continued if you print hexagonal holes. I also wonder what would happen if you connected the two vertical holes into a slot.
Interesting…and not that you know of yet.
Looking at your photo, this looks like you are retracting, and it takes the nozzle a little bit to equalize pressure and get filament flowing again. -You’ve got some severe under extrusion around the high-retract areas.- nevermind, apparently that’s just glare
It is the result of the nozzle taking a different path due to the planner needing to hit each “island”. You’ve got a little bit of ringing in each of your acceleration moves as well, so it might be good to stiffen up your hot end mount if you have the ability.