Here's a first iteration of a 3D-printed dipstick. I'll make one in nylon too, since it has better heat resistance.
The width is 5 mm. The hole is 2.5 mm, though the thickness of the plastic strands make it 2 mm. I figure I can attach a piano wire or something, will see how it turns out.
I've attached the .stl file (zipped, or forum won't allow it), ready for a 3D printer.
Kudos to my buddy Robin for allowing me to take all the credit :p
W460 -85, currently undergoing engine swap om617 to om606!