Support Rails for Silhouette Cameo 4 Cutting Mat

I designed one support rail with an edge/guide at the left side (for proper alignment of the cutting mat) and a generic rail without edges to be used in the middle and at right side.

Each rail comes with two parts for easy and stable printing without supports: The rail itself has a small pocket at the bottom with 2/3 holes to insert the second part, which is the block to snap in at the Cameo 4 Roll Feeder pockets/edge.

Printing and assembly of the rails:

1. Left side (required each one piece):
   1. SheetRails-SheetRailL and SheetRails-SheetRailLFoot
   2. Optional: You can use “SheetRails-SheetRailLFoot+0,5mm” or “SheetRails-SheetRailLFoot+1mm” as alternate snap-in block with additional offset/space between your Cameo 4 and the Roll Feeder pockets. This might be required if this rail is to loose and does not snap in at the two alignement skids at the curved output tray. I recommend to first use the “SheetRails-SheetRailLFoot” and see if it fits. If the rail is too lose you can still print one of those alternatives and swap the pieces (as long as not glued, see next steps) without any need to print the full rail again. 
   3. Insert the foot block at the bottom of the rail (3 pins, check for the right orientation!)
   4. You can use glue - mine snapped in with some force without any glue required (PLA)
2. Middle and right side (print as many as you need - I recommend to use three):
   1. SheetRails-SheetRailM and SheetRails-SheetRailMFoot
   2. Insert the foot block at the bottom of the rail (2 pins, check for the right orientation!)
   3. You can use glue - mine snapped in with some force without any glue required (PLA)

For easy printing just use the gcodes or two 3mf files including the proper slicer settings (just change the filament type if you use any different). 

Mounting (and unmounting) rails to your Cameo 4:

I recommend to use three middle rails for proper support of your mat- for details how to use please also check the photos.

1. To mount the rails pull out the Cameo 4 Roll Feeder (the Cameo 4 and the pulled out feeder need to be place on a plane surface/table).
2. Snap in the left rail (with the mat guide edge at the left side) first to the curved output tray (check that the two alignement skids connect properly - you should not be able to move the rail left/right).
3. Push down the end of the rail ("foot block") to snap in the feeder edge. It might help to lift the feeder edge a little for easy snap in.
4. Repeat step 2 and 3 for the other rails one by one. The "foot block" of those have several pockets to fit in the feeder edge (as this has different spacing than alignement skids of the curved output tray) - this way your are max. flexible to pick the proper position of the rail - you should ensure the rail to be parallel to the rails already inserted
5. Happy plotting!
6. Unmount the rails can simply be done by pulling up the bottom side of each rail. The rails fit in the case of the Cameo 4 while turned off (just don't forget to get those installed again before truining your Cameo 4 on!)

Last words

Thanks @Kaiser_101414 for inspiration- although I decided to create my own version from his design gave me some good ideas…