融合细丝制造（FFF）或融合的沉积模型（FDM）3D打印机因其简单性而闻名是最容易运行，校准和维护的机器。没有紫外线，树脂或粉末。校准通常归结为设置材料流，床位，喷嘴高度和皮带张力。这是正确的Markforged桌面3D打印机同样，尽管不需要材料流，因为系统已经在系统中已经设置了。
为了校准塑料，打印了床位测试圈，使用户可以同时调整床位和塑料喷嘴高度。床位测试圈需要一些练习，但是如果掌握的话，可以是精美的印刷品，“确定”印刷甚至失败之间的区别。
Using Shims to Reset Markforged 3D Printer
Markforged composite printers come with a set of shims that are used to set up the printer and initially calibrate. If you move the printer or have a bad build, then it’s definitely a good idea to do a bed level shim and “reset” the machine. The problem with shimming is that it’s too subjective and will produce different results depending on the user. For this reason, the shim calibration is not accurate enough to get consistent, top-level prints. However, shims are a great way to get the printer “in the ballpark” so that bed level test circles can be performed next.
床位测试如何工作？
要启动床位测试圈，请访问实用程序>测试打印>用户界面上的床位测试打印。打印机将在打印阶段的每个调节螺钉上打印一个圆圈，中间有一个瘦的吹扫条。
Depending on the quality of each circle, the screw will be adjusted up or down to improve the defect. This simulates the first layer of your print, so the better your circles are, the better your print will be. This should be run multiple times until all three circles come out perfect.
What Do Good and Bad Circles Look Like?
不良圆圈将看起来不同，具体取决于喷嘴太高（远离床）还是太低（靠近床）。当喷嘴太高时，由于材料没有被喷嘴“熨烫”，挤压线将无法正确粘合。当材料下垂到构建板上时，线条可能不会直截了当。
If the nozzle is too close, then the nozzle will prevent the material from extruding properly, so you get very skinny, stretchy circles.
如果喷嘴太近了，您甚至可能根本没有圆，也可能没有一个圆圈。
您正在寻找的是一个很好的，甚至是挤压线之间的圆形。有时，有一个轻号喷嘴阻力痕迹，可以像下面的照片中看到。不用担心，这实际上可能是一个好兆头。
测试您的床位圆圈
To test each circle, simply try to pull them apart with your fingers. A perfect circle will not stretch, and will not break even when being pulled on by its fault lines. If the nozzle is too far, then the circle will break as the bonding between the lines is weak. If the circle is stretchy, then your nozzle is too close.
调整标记3D打印机上的螺钉
调整螺钉时的一个好策略是，更少的是更多。我的建议是在接近水平时进行非常小的螺丝调整，因为射击过去可能会导致浪费时间的来回。随着该过程变成肌肉记忆，您将更好地感觉到螺丝旋转多远。同时，建议以小10-20度增量进行调整。
定期打印床位测试圈是确保印刷品中最优质并防止耗时失败的最佳方法。我鼓励所有操作员在日历上花一些时间来练习一点。值得花时间将其变成肌肉记忆。
If you have any questions or are consideringMarkforged3D打印技术为您的组织，联系我们at Hawk Ridge Systems and our dedicated team of additive experts can help you get started.
祝大家好运和快乐印刷。
