The oblique pens are Derived from theremar's nice 35-degree oblique pen, these pens have a 45 degree angle. The lefty versions also have a 10-degree downward adjustment and twist. Further, you can edit the angle in the .scad files for any angle you want.
The straight pen is designed from scratch with a triangular grip, to help you find the same holding angle again and again. Should fit many nibs.
Name Last modified Size Description
Parent Directory - hello-thingiverse.jpg 03-Feb-2018 17:56 356K lefty-angle.png 03-Feb-2018 18:11 20K oblique-pen.jpg 01-Feb-2018 06:45 351K tripen.jpg 19-Apr-2018 13:46 111K pen0002.scad 01-Feb-2018 06:57 2.1K Fits speedball 512 pen0002.stl 01-Feb-2018 06:57 2.7M Fits speedball 512 pen0003.scad 01-Feb-2018 06:57 2.4K Fits speedball 99 pen0003.stl 01-Feb-2018 06:57 2.8M Fits speedball 99 portapluma_oblicua_anatomic..> 01-Feb-2018 06:37 634K Handle by theremar, used by both scads pen0002a.scad 03-Feb-2018 18:57 2.1K Lefty version, speedball 512 pen0002a.stl 03-Feb-2018 17:46 2.8M Lefty version, speedball 512 straight0001.scad 19-Apr-2018 13:46 3.0K Triangular, straight holder straight0001.stl 19-Apr-2018 13:46 279K Triangular, straight holder small-chuck.stl 01-Feb-2018 06:37 42K Used by pen0003.scad pen0003a.scad 03-Feb-2018 18:57 2.3K lefty version, speeball 99 pen0003a.stl 03-Feb-2018 17:47 2.8M lefty version, speeball 99
Raft/brim and support are mandatory. Nothing special otherwise.