Combined boths pens.
Added the ability for the Ergopen to be able to accept BIC pen refills as in the nostalgia pen after resizing it to 115%.
Was really hard to edit as all i had to work with was the stl, had to make my own pen, then make a "mold" for the finger indentations. then use that mold to transfer it on the new pen.
Please print with a raft so it doesnt fall down. Also make sure travel moves do not cross outlines to avoid any inner retraction strings from making the pen refill not fit smoothly.
Added a new version, which moves the tip 6mm closer to the fingers for a closer writing experience. This version may be easier for those with smaller hands.
Print with 2 layer, 8 perimeter skirt for best adhesion. Use a raft if you must.
Cartesian printers are likely to get loose and fall. Be aware!
Also make sure travel moves do not cross outlines to avoid any inner retraction strings from making the pen refill not fit smoothly.