@jgb very impressive design. Based on your design and my own experience/where I landed with my Snapmaker 2.0 A350 setup, here is some feedback I have (See photos and bullets below). Just one person’s feedback so take it with a grain of salt. If you have any questions, just let me know.
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Rather than building a rolling cabinet, I purchased once from. I recognize this is the more expensive option, however the amount of accessories that come with the Snapmaker 2.0 A350 require more storage than I think you’re expecting
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In my case, I needed all four sides of the machine to be readily accessible. Normally, the enclosure only comes with sliding doors on the front and side. I purchased a third sliding door and reconfigured the enclosure frame (magnet inlays) so that I could access the machine from three sides. I also put the entire machine on heavy duty ball bearing slides. I recognize that compared to your cement slab this may sacrifice print quality due to vibration, however I have not notices a significant effect and find the slide an easy way to access all parts of the machine.
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The HEPA and Carbon filtration is a nice touch, but I think you’ll need either an extremely powerful vacuum (loud) or you should consider doing the intake closer to the tool head for CNC – See Gil’s self-impelled CNC post here. In my case, I wired in a secondary fan and routed the outlet to a Tupperware container filled with carbon and paint booth filters. It works generally for small dust, but when your cutting materials like wood or metal, it’s not strong enough to clear the work area
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On the spool-holder pull-out, you may want to consider more spool storage. Initially, I suspected I would not have more than 5-10 spools at any given time, but as you will see in my photos, I needed to dedicate two drawers based on the combination of colors and material types. I’d also suggest printing a desiccant container with a significant amount of breathability. I ended up reusing a Tupperware container and drilling holes, but there are much more elegant solutions. I also think if you can space it out in a flat panel, rather than a tall/thick container, you’ll end up with better absorption
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See attached photos of my tool and tool head drawers. I ended up needing to dedicate two full drawers to just the tools and tool heads. Granted I reused the original packaging materials in each drawer to make it look a little more custom. I have not finished the second drawer since I now have the new laser hear, but I plan to recut/distribute the layout to be more organized.