Just an observation, unless you already have a big pile of 20x24 sheet films that you need to dispose? If not, I would really acclimatize to the cutting your own film size with smaller format first. It's not just the cutting equipment and the expense of it, but the entire logistic of handling ultra large sheet films in the dark. Technically speaking, and not saying it's not possible, it's fairly impractical to try to cut large sheet of film to size unless you have a very clean and large dedicated darkroom space. Obviously if you have to, or simply wants to, no questions here, but be prepare to deal with how to handle large sheet of film in total darkness without getting dust, greasy finger marks, kinks, crimps, buckling and scratch marks on your not so cheap film. Cutting down from 11x14 or 8x10 film is one thing, 20x24 is entirely different animal. And for the actual cutting, either the Rotatrim or the Kutrimmer will work fine, personally I prefer the Kuttrimmer because I don't have to use my hand/fingers to hold down the film when making the cut:
https://www.binding101.com/mbm-kutri...0aArJ4EALw_wcB
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