Apple Pencil Pro ergonomic grip sleeve TPU
A slide-on TPU sleeve that thickens an Apple Pencil Pro or 2nd generation (8.9 mm across with one flat side, 166 mm long) to a 13 mm grip for long drawing sessions, easing hand fatigue without covering the double-tap zone or the magnetic flat. The bore is 9 mm with a matching flat so the sleeve does not rotate, the outer has three soft finger flats, and it is 60 mm long with 2 mm minimum wall. Print it upright in TPU at 95A, or in PETG with a 0.2 mm larger bore.
Generic pencil grips are round and let the flat side of the Pencil spin out of place. In SpeakCAD you say which Pencil you own and how thick a grip you want, preview the sleeve free in the browser, refine the finger flats in the chat, then download the STL.
Design a 60 mm long TPU grip sleeve with a 9 mm bore that has a 7.5 mm wide flat on one side to match an Apple Pencil Pro, an outer diameter of 13 mm with three shallow finger flats, 2 mm minimum wall, 1 mm chamfers at both ends and a 0.1 mm bore clearance.