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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.
Elbow Axle Thrust Collar
A shaft collar for the 8 mm elbow rod in the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit: 32 mm OD, 10 mm tall, with an 8.3 mm bore and a raised thrust ring (11 mm OD, 0.5 mm tall). The ring pushes up only on the inner race of the forearm's lower 608 bearing. It locks with one M3 set screw into an M3 nut that drops into a 5.7 mm slot open at the top. Two grip flats 29 mm apart let you hold it while you tighten.
SCARA Forearm With Elbow Pulley
This is the forearm link of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit, measuring 159 × 44 × 35.5 mm. Its elbow hub carries two 608 bearings (8 x 22 x 7 mm) in 22.05 mm pockets on the 8 mm elbow rod, and it has a printed 60T GT2 pulley for 6 mm belt (37.69 mm tip OD, 44 mm flanges). A belt-anchor pillar holds both belt ends in 2.2 mm tangential slots, and each end wraps around an M3x16 pin screw held by a captured nut. A ribbed beam runs 120 mm out to a 34 x 34 mm tool pad with four M3 heat-set inserts on a 20 mm square and an 18 mm pen hole.
SCARA Upper Arm Beam
The upper arm link of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 177 x 50 x 22 mm ribbed beam with a 140 mm shoulder-to-elbow span. At the shoulder, an OD 44 pad bolts to the 60T hub with four M3 screws on a 34 mm PCD and has a 10 mm hole for the rod end. The elbow NEMA17 sits on a flat pad with 3.4 x 9.4 mm slots (31 mm square pattern) and a 23 x 29 mm pilot obround, so you can slide the motor ±3 mm to tension the GT2 belt. The elbow end has an OD 22 boss with an 8.3 mm bore for the 70 mm 8 mm rod, held by two M3 set screws in captured nuts, and an OD 11 thrust island underneath that bears on the 608 inner race.
Shoulder 60T Pulley Hub
This rotating shoulder hub is part of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 52 x 44 x 38.5 mm part with a 60T GT2 pulley at the bottom (tip OD 37.69, 8 mm track between 1 mm thick, 44 mm OD flanges) and a 44 mm bolting flange at the top. It runs on two 608 bearings in 22.05 mm pockets (6.5 mm deep at the bottom, 7.2 mm deep at the top) on the base's 8 mm shoulder rod. The top flange takes four M3 heat-set inserts on a 34 mm PCD for the upper arm. A +X lug holds both ends of the open GT2 belt in 2.2 mm slots, each crossed by a 3.4 mm hole for an M3x16 pin screw.
Shoulder Motor Hanger Bracket
A C-shaped bracket from the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It hangs the shoulder NEMA17 shaft-up under a 5 mm top plate with a 31 mm square M3 pattern. The M3 holes are 3.4 x 9.4 mm slots and the pilot opening is a 23 x 29 mm obround, so the motor can slide ±3 mm to tension the 3:1 GT2 belt. The part is 59 x 56 x 55 mm. It bolts to the base's 40 x 40 mm heat-set pattern with four M3x10 screws, leaves 45 mm between the foot and the plate for the motor body (motors up to about 44 mm long), and prints lying on its back wall with no supports.
SCARA Base With Shoulder Tower
This is the foundation of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 150 x 110 x 5 mm windowed plate with a raised rim and a 26 mm OD shoulder tower, 60 mm tall, braced by four 40 mm gussets. The tower takes a 100 mm long 8 mm steel rod in a blind 8.3 mm bore, locked by an M3 set screw with a captured nut. A thrust ring (OD 11) carries the 608 inner race. The plate has four M3 heat-set inserts on a 40 x 40 square for the shoulder motor bracket and four 4.5 mm holes for M4 screws into the table.