CNC 3018 Sacrificial Bed Holder
thingiverse
I had noticed a similar design by Askyra, but possibly due to issues with my small printer, it didn't fit perfectly. Creating mine, I also decided to make some minor modifications. These are designed to hold a sacrificial bed, but can of course be used to clamp down other material directly as well. The main advantages are that you don't restrict your workable area and collisions between the holder and spindle are less likely. There are three sizes: short (15 mm), medium (25 mm) and long (30 mm). I created the short version first, but I wanted to add more space between the tool and holder. The long version allows me to use wing nuts to hold the bed down and avoid contact between the wing nuts and the spindle. You can then use larger beds with space outside of the workable area for clamps or screws. Right now I am using 340 x 240 x 12 mm MDF boards. (Tip: drilling holes in MDF will make the bottom tear out. To avoid this, support the board with some scrap wood or similar.) The holders are made for M6 hex head bolts that came with my 3018 Pro clone and the corresponding wing nuts. Especially when working with a 3018 Pro, make sure to push the M6 bolts all the way into their spot so they don't crash into the bottom plates. Please let me know in the comments if these work for you or what changes/improvements I can make.
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