Roller Pen

It has a thick and short shape, but it is strong. It is ready for supportless printing in horizontal position (that is important for strength of the pen), however your slicing software can detect minor supports, but you can easily print it without supports.

Be careful, pen body must be sticked to bed well. Otherwise it cannot be fitted well with pen head.

Front bottom sides of the pen heads looks like pulled upward. because nozzle pulling that thin side, it looks like a little broken but it works fine.

I think a pen design is all about calibration and strength. I attempted before but results are not satisfied me and I paused this project for some months. Later I reconstruct it and now it is better enough for sharing.

You need only rollerball pen refill.