( I was about to upload this, thinking it may be unique, and noticed another nibbler project. Check it out. https://www.thingiverse.com/thing:3514346 )

They call this device a nibbler, for cutting sheet material. It will cut paper, plastic, cardboard, leather, fabrics, sheet metals like mild steel, aluminum, and so forth.

They are normally used freehand, attached to a drill, with a handle. But they can be mounted on a bench. Then you can use two hands to guide your material into the little cutter. The round cutter moves up and down. On the down stroke it bites a tiny quarter-moon shape from the material. If you're cutting metal, be aware the chips are very sharp and pointed.

When assembled, the drill's chuck is tightened onto the nibbler's drive shaft. That holds everything together. Photo shows it temporarily clamped to a table, but use a couple screws if needed.

Size the holes to snuggly fit your drill, and your nibbler. The bracket's overall length may vary. I made this to fit my tools. Chances are it won't fit yours.

Sheet material is usually fed directly into the cutter, without any support under it, but I printed a little tabletop to assist when cutting smaller things.

See Youtube for demonstrations of what a nibbler is capable of. Amazon sells them along with steel mounting brackets, similar to this project, for maybe $10. One size fits all... or fits none.

0.3mm layering, with a raft. I used a minimum of fill. The bracket required 110 g ABS and took 4 hours. The table was 2h 20m, and used 70g ABS. These files are SAE (inch). If software sees tiny files, scale them up to Metric, by a factor of 25.4 (there are 25.4 mm to the inch).