This is a cover plate for the stepper motors in the Anycubic Kossel Linear Plus, which should prevent small particles or plastic residue from falling into areas you can't easily get to. It will only work fine for the 240mm (Linear Plus) version of the printer and is not compatible with the smaller version.
The model has been designed with a 0.5mm gap between the plate itself and all other colliding objects, except for the holders that fit into rails to keep it in place. If you have printing material that likes to bend, you will likely have to bend it back, and this may also result in it sitting far closer to the actual surface of the rail.
The original Autodesk Fusion 360 file can be downloaded here: https://a360.co/2lcgYfG
The first version of this can be found here: https://www.thingiverse.com/thing:2945186
Anycubic Kossel Linear Plus
10% or higher, lower will break apart on removal.
I recommend a Brim instead of a raft. A raft will likely stick to the build plate or make it impossible for you to print this in the first place. Also make sure that your build plate has been used before using a wider print, it will make removing this solid piece far easier.
Stringing and ringing (ghosting) do not matter a lot for this. As long as you can get solid lines printed using your settings you're good to go.
Attaching to the Anycubic Kossel Linear Plus
The design is simply slide-on and grip using the bending of the material itself, so I can recommend using something that bends more, but is otherwise equally solid as the PLA I have. This should result in a strong print that holds itself in place, drastically reducing noise of moving parts.
Measuring The Anycubic Kossel Linear Plus
Everything usually begins in planning and design, and this was no exception. I knew what I wanted to create, and I had the basic tools to go at it: A working Anycubic Kossel Linear Plus, a ruler, a pen, and lots of free time.
For the model itself, I had to make several measurements:
- The Triangle structure itself
- The rails holding everything
- The gaps in the rails
- The build plate
- The build plate holders
This was fairly simple, up until the build plate holders. It turns out that when I built the Printer, these were off-center, so the build area I actually had wasn't 230mm, but it was way smaller. After lots of math (I'll spare you this part), I came to the conclusion that at 85.5mm distance to the beginning of the rail, these holders will keep the build plate in the perfect center. Adjusting for possible movement and imperfect build plates, we arrive at 85mm.
So now we have the following measurements:
- Structure has a 125mm distance from center to the center of an edge, which makes it just slightly larger than the build plate.
- 30cm rails, 6mm gaps, equal distance to walls
- 240mm build plate, imperfect circle, but good enough to count as a circle
- 85mm from rail start until contact with the build plate holders
With this information, it was time to sketch the base model for further shaping in Fusion 360.
Sketching the Anycubic Kossel Linear Plus
(If you're following along, make sure that you've entered Sketching mode at this point.)
I've started with the build plate, which is a 24cm circle centered at 0, 0, 0 (X, Y, Z). Then I created a triangle with the distance to one edge (not a corner) being 12.5cm and also placed it at 0, 0, 0 (X, Y, Z). This forms the basic structure, and will be very important in the final printed shape - just one 1mm wrong and it won't fit anymore.
Now for the rounded corners. These are a little bit more difficult, but with careful placement of lines at the 15cm mark from the center of an edge, I was able to closely approximate the correct curve.
Finally, adjusting for imperfections in printing, I've added an offset to every important part of the print that needs to avoid already existing physical objects. I've added 1.0mm to the distance of the holders using an Offset, and added 2.5mm to the radius of the build plate. It was now time to design the actual surface, so I've selected the shape of the corner and extruded it with the height being 7mm (just about the height of the build plate).
Holes And Holders
The most important parts are the holes, so that we can even fit the shape onto the physical printer. Adding holes requires you to make a new sketch from the recently created object, as otherwise you will likely only be able to create new additional objects instead of cutting out of the object.
This is a bit more difficult to describe, due to the fact that this required careful designing. First I've sketched all holes out on the new layer, and then re-drew these as a single continuous line. Finally offsetting things again by our tolerance value (0.5mm) and then mirroring it across, so we have identical things on both sides. The result of this is a neat gap for the vertical rail that fits perfectly, and a gap for the rubber thing to go through - on the same side. Now I've extruded this by -7mm, which makes Fusion 360 cut it out of the model.
Going back into the sketch I've then added the rail holders by putting a rectangle 7.5mm away from the inner and outer rail edge, so that it fits nicely into the rail and won't randomly move. This I have extruded by 4mm.
Finally, to give it a bit of a easier fit for the rail holders, I've used the Fillet tool to curve off the holders using a 1mm radius. At the print quality I chose (0.3mm Z, 0.4mm X/Y) this makes for very few changes, but it allows it to sit on the rail if it bent a bit too far during removal from the build plate.
Now came the time to print three of these and attach them to the Anycubic Kossel Linear Plus.