Shims are elements that mechanically correct the Z offset when printing in Mirror or Duplication mode.
In these modes both toolheads work simultaneously, so it is key important to make sure both nozzle tips are exactly at the same height. Due to manufacturing and assembly tolerances the Z offset between tips can be up to 0.5mm. BCN3D printers automatically correct the offsets when printing in Mirror/Duplication Modes. However, this correction distorts the first layer of the model by repeating it as many time as needed. To avoid such distortion there are different options:
1. Enable raft in BCN3D Stratos.
The offset will be corrected in the first layers of the raft, so the model won’t be affected by any Z offset.
2. Install shims to mechanically correct the Z offset.
Printing a raft takes time and spends material. For those users planning to use frequently the Mirror or Duplication modes, it is highly recommended to install the shims when it is suggested during the Printer Calibration process.
How to install
The installation process is guided by the printers. Learn how to install your shims through our knowledge base.