Z-hop during toolchange

SanderLPFRG

Hi all,

I am trying to configure a Z hop during toolchange for IDEX.

I have added a G91 + G1 Z1 in the Tfree, and a G91 + G1 Z-1 in Tpost, but this results in the printer just hopping up and down instantly before actually changing the tool.

Is there a way to configure this in Duet?

droftarts

@SanderLPFRG For the use of the tool change macros, see https://docs.duet3d.com/User_manual/Tuning/Tool_changing

What version of RRF are you using? Are you changing between different tools (eg T1 when T0 is currently selected), the same tool (eg T1 when T1 is currently selected), or no tool (eg T1 when T-1 is selected)?

I'd say the Z movement is in the correct macro, but it will depend on what other commands are in the tool change macros (eg restoring tool position etc). Please post the tfree.g, tpre.g and tpost.g macros for the tools you are changing between.

Ian

sebkritikel

@SanderLPFRG You could try keeping the G91 + G1 Z1 in your tree, but then in tpost you could set up a restore point move?

https://docs.duet3d.com/User_manual/Reference/Gcodes#g1-controlled-linear-move

Example - G1 R2 Zxxx , with xxx being your Z-hop height, and then follow that with G1 R2 Z0. Likely would want both lines at the end of your tpost. This would restore the print head to the position stored before the tool change, but offset by Zxxx. Then it would restore down to an offset of Z0 from the restore point (thus completing the Z-hop).