Unfortunately, I haven’t cut anything in a little while. Been really busy with other things. Overall, I think the mount has worked great. As long as the parts are tight, there’s very little flex.
I’ve only made one change to it, and I wouldn’t recommend adopting the change immediately. I’ve added longer threaded rod and additional couplers/nuts as spacers on some of the mounts. This is intended to raise those pins so that each belt is parallel with the ground and none of the belts angle upward to the machine arm. If adopting this change, you also have to adjust some settings in the yaml file that attempt to compensate for these angles. That being said, this change is more of a fine tuning and not at all necessary to make great quality cuts. I’d recommend getting things mounted and working as simply as possible, and later, if you would still want, it’s really easy to go back and adjust and fine tune that if you feel it’s worth the additional time. When starting, simplicity really is best and then after you are more familiar with how the machine works (and you have it working well) you can tweak things like this.
The only downside has been if I forget to remove the posts and accidentally kick one while walking through my garage (quite painful).
You don’t need to do it from the start, but a Z-probe is really great addition that is easy to build. Check out my post here (Instructions - How To Make And Set Up A Z-Probe On The M4). Though I think I need to update several things following the 1.0 firmware.