FlexFlexRail

thingiverse

I've modified FlexRail with Knobs on one side, now it has knobs on both sides. I had an idea to use my empty filament spool for building another track for the ball track. Add a "Distance" part so there's enough height between two FlexFlexRail. This part is similar to ft 38246 "Bauplatte 15x15 1Z rot" but with 12x10mm dimensions (and a bad knob). Fischertechnik Steel Balls have a diameter of 12,7 mm. The knobs are longer so no support structure is needed, but round knobs are better for the rail's slope. I stretched the rail to 17mm wide outside and 229,99 mm long (my maximum limit). New version 0.133: it has 10 knobs on both sides, and you can glue extra knobs if needed. Add a minimum angle block (halter) for connecting two FlexFlexRail with a 5° angle in the groove. The angle block has two cavities for inserting the rail when fixed (e.g., inside an empty filament spool). To do: create a negative angle block for mounting on the outside. The height of 58 mm comes from the inside of the empty filament spool. When I placed the knobs on both ends of the rail, I realized two Fischertechnik blocks have a minimum distance between the groove of 15 mm (middle to middle). Add two versions with knobs on the outside too. The distance from the outside knobs of two parts is 15 mm, and you can use two Fischertechnik basic blocks or the double basic block. If you need a greater height, you can stretch the block in the slicer/printer software. To do: create a version with grooves on top and bottom.