K40 Long Laser Tube Mason Jar Extension Adapter
thingiverse
This allows you to screw a Mason jar onto the end of your K40 to accommodate longer tubes such as a 50W tube. I remixed this so that you can drill your own holes to match your setup and also re-use the existing hardware. As additional safety measure, I wrapped my Mason jar in a few layers of foil and black duct tape. If you want, you can buy me a coffee at https://ko-fi.com/vampyrex13.
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