This is a seat for the Inmotion V12 electric unicycle. It does not require adhesive velcro or double-sided tape to install it, it is mounted on another piece that is fitted on the trolley of the unicycle, also without velcro and without double-sided tape. That other piece has a negative rail and the seat has a positive rail.
UPDATE: there is a tolerance of 0.4mm originally (visible in an image), in the files there are samples of the fit so you can print a sample and check that it works correctly, if not you have to scale one of the two pieces until you get them to fit as desired. Once the tolerances have been checked and the ideal scale values have been achieved, the two main parts can be printed to ensure a good performance and not to waste material with a defective print.
The seat can be adjusted forward or backward due to the fact that it can slide along the rail and is removable so that it is not worn when not needed. The attachment that attaches to the trolley can also be removed and put on without a problem and thanks to the rail you can add other things to it, it also has the name INMOTION V12 embossed on the sides.
I share the file of the piece that goes on the trolley and 2 versions of the seat, one smaller (100x200x47mm) and one larger (120x300x47mm). The width does not exceed in any of the two cases the width of the wheel so neither bothers in driving and you do not notice that it is installed until you sit down and use it.
I personally prefer the large version but some printers won't be able to print it due to the dimensions, so the smaller version is for those printers with smaller print area, or for those who don't want such a large seat or to spend more material.
UPDATE 2024/06/21: Added a small variation of the v3 seat (v12_seat_v4.stl), I have also added a variant of the piece where the seat is placed (v12_rail cover with letters 150mm.stl), this version has the name INMOTION V12 embossed on the sides and is 150mm long, compared to 120mm of the previous version. Also to make it easier to download all the files I have compressed all the files in the same ZIP file.
If you have suggestions for improving this design or for other designs feel free to contact me. Also if you are encouraged to download and print these files I would appreciate if you would share your make and leave a comment on what you think of the accessory. Thanks