7/6/2023 0 Comments Cetus3d printer password![]() ![]() This is what happened with the calibration. This is not a problem if the load on the belt is constant, but when the load changes, the height will not follow the steps of the motor one-to-one any more. At least the z-axis moves a little bit up and down when pushing or pulling on it. The z-axis belt seems to be slightly flexible. And it is easy to see why that is happening. When calibrating the nozzle height with the spring installed, I got considerably larger values for the z-offset than without it. This is when I noticed that the spring approach might not work after all. Fortunately it stuck on the left side and the print was finished and produced a usable (albeit lightly skewed) spring. This reduced the adhesion and the raft peeled off on the right side of the print. The z-axis could not reach the position it wanted to and the first layer was extruded at a too high position. I forgot to remove nr 3 before starting the print of nr 4. ![]() While printing nr 4, it also became obvious why this parameter had to be tuned: It took me until iteration 4 to get the height just about right. The nozzle could no longer reach the build plate. The first iteration already seemed promising, but it was too high. So I designed a plastic spring in Fusion 360 and got printing: The spring would probably not be able to stop the thing completely before the nozzle touches the build plate if the z-axis fell from the top position, but a decelerated impact would be better than a full speed one. ![]() In normal operation, the z-axis would push the spring down to build the first centimetre of the prints. My first idea was to print some sort of spring mechanism that would catch the y-axis when it comes crashing down. Also it is much more fun to design your own solution. I would like to avoid any manual locking or unlocking. When the z-axis is locked, it needs to be released manually when one wants to start a new print. This is done either manually or when the z-axis reaches a certain height. There are already a few designs out there that deal with this problem, but they usually just lock the z-axis completely. ![]()
0 Comments
Leave a Reply. |