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We demonstrate the Scrappy and Substiports systems that use an intermittent interaction approach and integrate into existing CAD software to reduce print time and material with unmodified fused deposition modelling printers. The approach uses ad hoc objects inserted by a user during printing as a replacement for printed internal and external support structures. Examples of objects include household items like books, scrap objects, toy bricks, and custom mechanisms like a screw jack. Our software-only systems assist in maintaining a library of replacement objects and allow customization of the effort to savings trade-off of making printing more sustainable through manual interactions.