BS Hot Fins and Anti-sag PINDA for MK3S R4 Extruder

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This is a modified version of the Prusa MK3S R4 extruder.\r\n\r\nAdds detachable hot fins to the bottom of the extruder body and extruder cover, allowing for easier replacement of sagged portions when printing with ABS or polycarbonate materials. These fins also help prevent the thin parts of the extruder from sagging.\r\n\r\nIncludes a support brace for the PINDA clamp to resist thermal sagging reported by MK3S users who print at higher temperatures.\r\n\r\nOnly the hot fins, extruder cover, and extruder body are provided. The remainder of the extruder should be printed from Prusa MK3S R4 extruder files.\r\n\r\nRetains the original Prusa filament path.\r\n\r\nPrint the hot fins using high-temperature materials like ABS or polycarbonate.\r\nMain portions should be printed in PETG.\r\n\r\nThe hot fins attach using M2 x 12 mm bolts.\r\n\r\n---\r\nUpdate Log\r\n\r\nIncreased the diameter of the M2 holes on the main bodies for easier M2 screw installation.\r\n\r\nSplit the fins into a separate 3mf preset for Polymaker's Polymax polycarbonate material.\r\n\r\nAdded support for the PINDA clamp.\r\n\r\nThe Polymax polycarb 3mf now includes the entire extruder main body and cover. Remove any unnecessary items before slicing.\r\n\r\nIf you have not printed with Polymax previously, apply a smooth PEI print bed with glue stick, dissolve and spread the glue with a wet paper towel, and dry it at 100C to create a reliable bonding surface for Polymax.