Where can I go online to purchase either replacements or upgrades for my 40w

Lasers
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1

Where can I go online to purchase either replacements or upgrades for my 40w co2 laser engraver

2

@John_von ​​ here is a collection I have of many upgrades I and many others have done in the past. all with the place to buy for reference https://plus.google.com/collection/EndMTB

3

thanks Ariel for the guidance.