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SCARA Pen Clamp Lift Slider
This pen carrier is part of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 24 x 24 x 32 mm block that slides in the SG90 tool head's 24.8 mm channel with 0.4 mm of clearance per side. It has a 14.6 mm pen bore and an M3 side clamp that uses a captured M3 nut in a 5.7 mm slot, so it holds pens from 8 to 14 mm. A 16 x 6 mm lug sticks out 7 mm from the +Y face so the servo horn can push it up from below.
SG90 Pen Lift Tool Head
The pen-lift tool head for the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is 39 x 60 x 54 mm. A 34 x 60 x 5 mm top plate bolts under the forearm tool pad with four M3 screws into heat-set inserts on a 20 x 20 mm square, through 3.4 mm holes. There is a 16 mm pen hole in the middle. Below it hangs a square guide channel for the pen slider: 24.8 mm inside, 2.4 mm walls. The +Y wall has an 18 mm lug slot, and 3.4 mm cross holes take an M3x35 retainer. A gusseted 4 mm plate holds an SG90 servo in a 22.8 x 12.4 mm window. Its tab notches fit screw spacings from 26 to 29 mm, so the horn swings just outside the slot and lifts the slider lug.
Pen Lift Guide Frame
This C-frame is the pen-lift guide for the 'NEMA17 Cantilever Pen Plotter' kit. It bolts to the pen shuttle's M3 heat-set grid (20 x 20 mm) with four M3x10 screws. Two 4 x 55 mm steel guide pins press into its 6 mm arms 24 mm apart, and a 16 mm pen pass hole runs between them. An SG90 servo fits a 23.5 x 13 mm window with slotted tab holes that take 26–31 mm tab spacing. The frame measures 78 x 58 x 25 mm and prints flat on its backplate with no supports.