Pocket-hole drilling jig block
This jig guides a stepped 9.5 mm pocket-hole bit at the standard 15 degree angle into the edge of 18 mm sheet goods, for pocket-screw cabinet joints without a commercial kit. The block is about 60 x 40 x 45 mm with a fence lip that registers against the board face, two angled guide bores of 9.7 mm to leave room for a metal sleeve, and a 6 mm clamp slot. Print it on its back with 6 walls so the bores stay crisp, in PETG for wear resistance.
A downloaded jig is fixed to someone else's stock thickness and bit. With SpeakCAD you type your board thickness, screw length and bit diameter and get a block sized to your workflow, then tweak the fence height in a follow-up message. Generating and inspecting the model is free.
Create a pocket-hole drilling jig 60 x 40 x 45 mm for 18 mm plywood: two 9.7 mm guide bores angled 15 degrees, spaced 25 mm apart, a 10 mm fence lip along the bottom edge, and a 6 x 20 mm clamp slot.