The Regressive Extrusion Addon, which Prusa 3D presented, offers a novel approach to print failures compared to standard extrusion methods. Instead of simply halting a failed print, the maker has developed a system allowing a user to iterate over a design without consuming any filament. This feature is a firmware update specifically for printers with Buddy-based systems. The maker's assembly is quite elaborate, featuring a large circular spool setup which includes an orange core and an outer black face.
The construction involves several specific components. Hardware includes an AI camera module fitted inside the enclosure and a spool holder fitted with two stepper motors. A prominent feature is the external desk button marked UNDO with an arrow. The maker has also incorporated an orange printed bracket which secures two small black components. This device allows the extruder to retrace its toolpath when an Undo icon is selected, resulting in printed plastic appearing to retract back into the nozzle.
This technology is designed to recover filament and rewind failed prints. The maker notes that using Prusa Connect allows users to click on a part to cancel it. While the maker demonstrates a simulated web shop listing for the Regressive Extrusion KIT, they have left open questions regarding how users would utilize the feature and what suggestions they might have for improvements.
Project by Prusa 3D. Watch it on their YouTube channel: