This pen cap is for a SUPERNOTE e-ink tablet Basic Pen that is ordered with the SUPERNOTE. (This pen type is also the Gintan/Chenguang AGPB1901 M&G Roller Ball Gel Pen / Youpin Series Gel Pen).

This cap prints very tight. You must force it onto the pen, and it snaps twice on the way to the final snapping position. After that, it normally loosens a bit (PLA), so that it stays on tightly, but not too tight.

It stays much more solidly in place than the default cap.

Due to printer and filament differences, you may need to resize this pen to something like 100.5%, or 99.5% (1.005, or 0.995), to account for tightness or differences. However, for the PLA on my printer, this is the exactly perfect size (after force fitting once) - and may be for yours also.