@Brook_Drumm First things first, 39 and had 5 different cars, all manual.
Anyhow, I know that a single motor for Z movement might have advantages, but my main thought was to do a single motor Z axis you do add some complexity, more parts, more weight for a single motor to drive, etc. This design is very simple, and to me the MK3 is the embodiment of the best ideas achievable at a reasonable price point.
I’d also be curious, from an alternate viewpoint, with these Trinamic drivers being able to detect layer shift, they should be able to know if they aren’t in alignment, no? This double Z access thing might end up being even less of an issue with the MK3.
The Z screws have such a mechanical advantage that the second screw isn’t remotely a problem. If you’re worried about a motor driving too much weight, more focus should be put into the sliding bed.
I wonder if the Trinamics can detect if one of the motors stalled if it’s driving two motors. The only way it can even hope to correct is if each motor has its own driver and that’s not the case.
Take away a coupler and motor
Add two pulleys, belt, two flange bearings, and maybe a sprung tension pulley. Not bad. Just a few dollars more. Do that on both sides and a motor in the center could be adjustable for tension… slightly more complicated but uniform. Laser cutters w adjustable z have done this forever. Beefy acme could replace the smooth bars.
/imaginary design session w no skin in the game
Brook
