NOTE: all photos of Kompi show an older intermediate version of this model; unfortunately my printer broke and I could not print a finished version so far
KOMPI is a fully functioning clip-on Mattebox for 80, 95 or 114mm and either one 4x4 or 4x5,65 filter (the 114mm backplate is experimental and might be too weak, use with caution). The Filter is as close to the lens as possible and also withing the box itself and therefore somewhat secured from stray light. Assembled it weights only around 115g (PLA, incl screws, excluding flags). The flag theirself are not part of the print, yet holders are supplied; I recommend cutting shape and size as you see pleasing from a light, black material (be it boards from a craftsstore or thin aluminium sheets); you can either glue or screw the flags to the holders. Holes for attaching the holders to the mattebox are given for all four sides.
ADDITIONAL PARTS For the assembly you need some additional parts
1x M4 nut 1x M4 scew, countersunk head, 50mm (alternatively you can use a fitting thumbscrew, head should only be 8-9mm in diameter) 4x M3 nut 1x M3 washer 2x M3 screw, countersunk head, 10mm 1x M3 screw, countersunk head, 25-30mm 1x M3 domed nut (optional, gives better grip) 8x M2,5 nut 8x M2,5 screw, 6mm 3x springs, 4mm outer diamter, ~12mm length (I use halfed springs from ballpens) if you want to install flags you also need the following (materials needed for each flag) 4x M2,5 nuts 2x M2,5 screws, 6mm 2x M2,5 screws, length depending on your flag-material 1x M3 screw, 30mm 1x M3 screw, hex head, 10mm 1x M3 wingnut (or equal)
ASSEMBLY The assembly is fairly self-explanatory, but you can follow this rough guide: - place BACK_HOLDER into BOX as seen on the pictures; use M2,5 nuts and screws to secure it only in the four outer corners for now. - push the three M3 nuts into RAIL_TOP and screw the two short M3 on the outer sides; the long M3 screw goes in the middle - place the three springs around the M3 screws and push it into/through the holes on the top of BOX - the long M3 screw will stick out on top, get the washer on it and secure it with the last M3 screw - install the M3 domed nut on top to have better grip of the mechanism - now cover up the RAIL_TOP with RAIL_COVER and screw it tight with two M2,5 nuts and screws - install RAIL_LOWER with two M2,5 nuts and screws - place the M4 nut on the lower part of the noses of the clip-on ring - push the M4 screw through M4_KNOB and screw it through the upper part of the noses into the M4 nut; use an M4 thumbscrew alternatively
If you want to install flags, do the following additionally for each holder: - push the M3 hex screw through the middle hole of FLAG_HOLDER, place a wingnut (or equivalent) on top - place two M2,5 screws into the designated gaps around the hex screw; push two M2,5 screws through BOX and screw it into these nuts on FLAG_HOLDER - screw the 30mm M3 screw through the long part of FLAG_TAKER; this adds stability - place M2,5 nuts into the rail of FLAG_TAKER and screw two M2,5 screws through your flags into these - push FLAG_TAKER into FLAG_HOLDER, adjust and lock with the wingnut (or equivalent)
You may want to rubber-ize the rails with e.g. electrical tape so they don't slide around on the slick plastic. And you are done :)
PRINT The print is super simple and needs no tricky settings. 0,2 layer height is fine. All parts need to be printed with support. Please have a look at the pictures of my slicer above to get an idea about the best printing-orientation.
... and to those who are interested and are still reading: the name Kompi originates from the german word for Mattebox, which is Kompendium. I wanted to call it Clippy at first, but that name is kinda loaded