IDEX CoreXY, With Only 2 Motors.
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I think, I'll put my brain on the real task and get the toolchanging to work.
For now I'll use a servo mounted on the far side to switch the locks. No added weight, and easy to implement.
I will also redesign the switches. No spring/ball but a piece of PTFE tube will execute both tasks. That will make the whole switch thinner. -
In another thread I found a link to @mrehorstdmd blog, where he used a digital dial indicator to check for unwanted axis-movement. I'll make a bracket to fit my analog dial to the locked (and springloaded) carrier to figure out how much more ringing I'll see with the spring vs. locked by a screw.
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Here's a simple dual extrusion system to tilts the unused extruder away from the print:
https://hackaday.com/2021/03/07/this-dual-extrusion-system-rocks/ -
@mrehorstdmd
Hmm, the ramps used to tip over the extruders are clever!
Maybe in the next project. Or I might add a dual extruder to each carrier? 4 tools are better than 2! But then the printable area would be even smaller...
But first off all, I want to get to the ground with the possibilities of this hack. -
Q: Can I home my XU axis during tool changes (frequently)?
I have one side of the servo controlled lock-switches done and wanted to work on the toolchange macro.
Turns out, the springload of the carriers is hard to predict and the steppers pulling the carrier into the spring might loose steps.
It would be helpful, if I could use a homeX/homeU command with sensorless endstops to cope with lost steps during toolchange.
Is it possible to home axis' during toolchanges mid-print?
Especially, because of the frequently changing drive mapping, it could confuse the FW which driver reports lost steps for which endstop. -
@o_lampe said in IDEX CoreXY, With Only 2 Motors.:
Is it possible to home axis' during toolchanges mid-print?
Don't see why not. @mrehorstdmd did a test homing X and Y ever layer.
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@Phaedrux said in IDEX CoreXY, With Only 2 Motors.:
Don't see why not.
@o_lampe said in IDEX CoreXY, With Only 2 Motors.:
it could confuse the FW which driver reports lost steps for which endstop
Because of the sensorless homing with varying stepper mappings?
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I guess I don't follow the concern. Either because there isn't a real concern or I just don't understand it. I'm not sure which.
What would your gcode sequence look like? Script it out and maybe we can spot anything suspect.
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@RichardDuke
hello, great achievement. do you have a site where we can download the stl? -
@richardduke
Just for the record, your idea inspired me to work out a simple optional IDEX variant. The Hitchhiker. The concept is not new, but I chose the BMG extruder gears to make a lightweight second tool. It seems easier to implement than a reliable locking mechanism, although I'm running short on stepper driver ports now
