MendelMax3 - Z Stepper Mount Flex - Part 2
After discovering the flex in my Z axis, I decided to see whether the flex was present just by moving the X-axis. I wrote the following snippet of gcode:
G28 X0 G1 X250 F3600 G1 X10 F3600 ...repeat the above 2 lines 10 more times...
and this is what I saw (with the original MTW mounts):
I decided to design a brace, which looks like this:
It’s designed to fit under the existing mounting plate:
And installs like this:
Now I get virtually no deflection:
About a day after I designed this, the MTW folks came up with a much simpler, easier/faster to print version:
These perform almost as good as mine, but are easier to install. Here’s a video showing the deflection while moving the X gantry back and forth (sorry - it’s slightly blurry):
I decided to use the MTW version due to end switch interference with my mount.
- 0.1mm deflection using the MTW mount that came with the printer.
- 0.03mm deflection using the modified OpenBuild mount.
- 0.01mm deflection using the MTW mount with the printed MTW braces.
- 0.005mm deflection using the MTW mount with my heavy duty brace.
The MTW braces are available here.
My heavy duty brace is available here. I don’t recommend using this because it has some fit problems (it interferes with the Z end stop).