Alfawise U20 Z Axis Leveling

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These two improvements for the Alfawise U20 can be applied together, or each one separately. **Mixed System of Final Carriage Z** To print certain materials such as ASA (one of the most resistant), it is necessary to raise the temperature of the printing surface to around 100 or 110°C. This is not possible if we do it with borosilicate glass (measuring it with an infrared thermometer shows that the temperature does not reach, or takes an excessively long time to reach). Therefore, with these materials, it is preferable to print directly on the warm aluminum bed. To do this, it is necessary that when removing the borosilicate glass, the lower carriage of axis Z stops 4 mm higher. **Warning: Since axis Z brakes 4mm before the factory system, the highest point will pass to be 4mm less, ie Zmax = 396mm, if you try to print a piece of 400mm high, the last 4mm will be a failure.** To do this, it is only necessary to place the part "AU20_Z_Axis_bottom.stl" in the chassis part that makes contact with the end stop. **Leveling System Without Springs** The leveling system by springs tends to produce deformation of the warm bed and/or in the Y rail support, in the form of sagging, since the user is not able to perceive the tension introduced in each spring. This effect becomes more pronounced if the temperature of the warm bed increases. To avoid it, the springs are eliminated and the guide screw is fixed to the bed with a locknut, besides replacing the leveling wheel with two opposing wheels on each screw (in total 8 leveling wheels). The "AU20 Z leveling gear V1.stl" and "AU20 Z leveling gear V2.stl" models can be used. It may also be necessary to enlarge the hole where the screw passes, in the displacement rail, so that the threads of the warm bed screw move freely (without hindrance) in their vertical displacement. **The Leveling System is Simple:** **Step 1:** The four lower leveling wheels are lowered, almost until their lower end. **Step 2:** The four upper leveling wheels are raised, almost until they touch the top locknut. **Step 3**: In the Alfawise U20 leveling menu, the 1st vertex of the bed is selected for leveling. **Step 4:** When the nozzle is positioned for leveling of the 1st vertex, the upper wheel is lowered until the said vertex of the bed is leveled. The operation is repeated for the 2nd, 3rd and 4th vertices. The bed is now suspended over the Y rail of the Alfawise U20, with no tension on the screws. **Step 5:** Now we return to the leveling menu and select the 1st vertex of the bed again. **Step 6:** When the nozzle is positioned for leveling of the 1st vertex, the upper wheel is raised until the said vertex of the bed is leveled. The two wheels are then adjusted to be fixed. The operation is repeated for the 2nd, 3rd and 4th vertices. The bed now has minimal tension, and minimal possible deformation.