Here is my second Voron on it's first print. Here is my experimental "Z rod syncher". I don't mind the dual Z stepper motors but on my first Voron they would become out-of-synch quite often. This stops that and by using the 60 tooth pulleys there is very little tension on the belt.
Posted Apr 8, 2017, 7:20 PM UTC
That "Z rod syncher" is brilliant (I have the same problem)! Are you going to publish the STL for the tensioner?
I've never seen dual z steppers come out of sync before. I've had them in all my printers, over 6 years now with thousands of hours printed between them.
It doesn't really affect printers other than coreXY where the bed is weighing down on them. An I3 will never really suffer from it because there's relatively little weight on them and they're homing down. A printer like the D-Bot which suffers from this as well to a lesser degree and the voron have heavy build plates especially at 12x12 where it's homing up, often to almost the end of the screw. When the stepper motors become unpowered on lead screws with a lot of pitch like T8x8 will backslide and de-synch. It's a relatively easy fix -- use a belted setup. I copied over using T8X2 single start screws like in my D-Bot setup as well to eliminate backsliding altogether. I've seen this problem in pretty much every coreXY design, hence why they all have some belted variant.
Interesting. I do use bigger steppers, so that's likely it for me. I can literally put the bed at a certain height, all the way up for instance, power off the printer, and leave it there for a month and it won't drop at all. Not sure what's going on with your setup.
Dunno, maybe my leadscrews aren't binding? Last person who told me they didn't have this problem with a 12" bed had leadscrews so locked up they were causing banding in their prints. They thought it was normal. If you have steppers with a worm gear, brakes, etc.. then those are designed to not rotate when powered off, so they don't need any further engineering. Normal ol' nema 17's don't exert enough torque to prevent backslide on a T8x8 with a bed as heavy as the Voron's.
That's likely it. I didn't use the nema steppers with integrated couplings either. I use the big 64 oz nemas on all my printers, and have had two corexy styles and 3 repraps and never noticed this phenomenon.
New Z mounts! Look nice in orange. Also like the synchronizer setup.
And you got V057, sequential dual VORONs :)
You posted the new Z mount STLs the day that I was going to print them. I found the "small clearance problem" with the first STLs of the new Z motor mounts, Dremel to the rescue. My Voron thinks that it is a Prusa MK2 with the orange printed parts.
Nice, here's hoping you get 57 so you can be next to you.
That actually happened