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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 Clamp Slider
This slider is part of the 'NEMA17 Cantilever Pen Plotter' kit. The 34 x 18 x 16 mm block runs on two 4 mm steel guide pins, 24 mm apart, through 4.4 mm slip bores. It holds any 7–12 mm pen in a 12.5 mm bore, clamped by an M3x12 screw and a captured M3 hex nut. An SG90 servo horn pushes up on the 12 x 14 x 5 mm lift tab to raise the pen. The two guide pins stop the wobble and drag you get when the lifter hangs from the servo alone.
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.