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Klipper setup

Overview

TapChanger is primarily a hardware project. The config here is just the setup I'm using. Which should be a reasonable starting point.

I'm working to upstream the changes in klipper where reasonable.

Installing

Prusa slicer config

I'm using the following custom Gcode.

Start Gcode - all must be a single line

PRINT_START  TOOL_TEMP={first_layer_temperature[initial_tool]} {if is_extruder_used[0]}T0_TEMP={first_layer_temperature[0]}{endif} {if is_extruder_used[1]}T1_TEMP={first_layer_temperature[1]}{endif} {if is_extruder_used[2]}T2_TEMP={first_layer_temperature[2]}{endif} {if is_extruder_used[3]}T3_TEMP={first_layer_temperature[3]}{endif} {if is_extruder_used[4]}T4_TEMP={first_layer_temperature[4]}{endif} {if is_extruder_used[5]}T5_TEMP={first_layer_temperature[5]}{endif}  BED_TEMP=[first_layer_bed_temperature] TOOL=[initial_tool]

Tool change Gcode

M104 S{temperature[next_extruder]} T[next_extruder] ; set new tool temperature so it can start heating while changing

Optional - Z homing with any toolhead.

The included config has a rather elaborate setup that allows Z homing with any toolhaed. This avoids the need to ensure that toolhead 0 is mounted before homing.

The tool changing needs reasonably repeatable gantry Z position, since Tap homes to nozzle possition, it will be different for each toolhead.

So this is a bit more complicated than yor typical setup:

  • Printer Z=0 - is tool independant, all toolchange moves happen in this space.
  • Tool probe trigger Z offset - distance betwen nozzle touching the bed and probe triggering - is tool specific, but nozzle independant. Specified in tool_probe.z_offset.
  • Tool Z offset - is tool and nozzle specific. Specified in tool.offset.

When homing the Z=0 is determined from probe tigger location - probe trigger offset - tool Z offset. For Tool 0 that is the same as normal Tap homing. For other tools the extra tool offset is substracted. Klipper unfortinately assumes that the Z=0 is a fixed distance from the endstop trigger location, so there are some tricks in homing.cfg to adjust this in post.

When printing, the Gcode offset is = tool Z offset.

When changing tools, Gcode offset = 0.