straight writing support

if you have problems with writing this item is for you!thanks to the track the ruler will always remain perpendicular to the sheet, so you can make all the parallel lines without any problem!you can use multiple sheets at a time, as the ruler can go up and down as you like.try it, and take your note-taking to the next level!Warning:wait until the plate cools down to be able to detach the piece, otherwise there is the risk that the piece will not be straight, changing the experience of use.print the "Rail" with tree supports.