MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Actually no, and with the weight of the laser I think you would end up putting too much force on the bottom back of the carriage and snap. The 3 screws in the piezo plate are necessary to make the whole assembly rigid. In designing the assembly I did some unscientific testing of materials and weight to see how much for it would take before breaking and this point was always the weakest.
As for tensioning the piezo, I played around with this a bit. I thighten the screws evenly until I feel a sudden increase in resistance and stop. The tool mount should not be loose, but not so tight that it cannot compress the piezo disc any further. This should result in a small amount of pressure be pre-loaded onto the disc. In my unscientific tests (I tried a few setups) it gave sensitive and repeatable results.
The being said the screws at the bottom which act as a hinge are very tight on my setup. In all tests that I did the tension of these screws was unimportant because the tool mount itself always responded to pressure on the nozzle and was readable by the disc. I tighten these screws so that they are tight and the mount is rigidly held in place.