Nozzle changer

[Harjit Singh]

Toby, can you share the design files for your nozzle changer, please?

https://www.youtube.com/watch?v=uOaBIDkO-QQ 

It looks like this one: https://github.com/richardklingler/openpnp/tree/master/openscad/toolchanger but isn't the same.

Thanks in advance.

[Toby Dickenson]

https://github.com/tobydickenson/SandwichChanger

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[Harjit Singh]

Wonderful. Thank you.

The last line in the Readme is:  Put a pillar nearby to carry the vertical force when loading a nozzle tip, to avoid causing the build plate to bend.

I don't understand, and didn't notice one in the video. Can you please elaborate?

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[Toby Dickenson]

This advice is for assembly onto the lumenpnp, and is specific to that
type of machine. The rigidity of the build plate on the lumpnpnp is
lower than typical for a pick and place machine. It is sufficiently
rigid for normal picking and placing loads, but the force of loading a
tip can cause the plate to flex. Opulo mitigated this with their stock
design by recommending super-slow tool changes.

The lumenpnp uses a pillar in the middle of a secondary build plate to
prevent the whole plate drooping in the middle. Search for "build
plate foot" on this page:
https://docs.opulo.io/semi-assembly-4-0/frame

I recommend using the same part directly underneath the toolchanger to
prevent flexing from fast changes.

Toby

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