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Split Ball Joint Hemisphere Set
This set holds every ball and spacer for the 'SG90 Mini Delta Pick-and-Place Robot' kit on one 87 × 87 mm sprue tree: 24 hemispheres, each 12 mm dia × 6 mm tall with a 3.4 mm M3 bore, and 12 spacers, 7 × 5.25 mm. Six hemispheres have a 6.2 mm counterbore for an M3x40 SHCS head and six have a 5.7 mm hex pocket for the M3 nut. Snap them off the sprue and they make the six ball pairs that seat in the 12.4 mm cups of the link rods.
Delta Tool Effector Plate
This is the moving tool platform for the 'SG90 Mini Delta Pick-and-Place Robot' kit. It is a 62 mm, 5 mm thick truncated-triangle plate carrying three 8 × 14 × 22 mm joint blocks at a 20 mm radius. Each block has a horizontal 3.4 mm bore at z = 16 for the M3x40 SHCS split-ball stack, which puts the ball pairs at ±15 mm. The centre has a 12 mm tool hole and four M3 holes (3.4 mm) on a 20 mm square. The edges are notched concave under the ball pairs so the link-rod cup bosses clear the plate.
Delta Parallel Link Rod
A 118 mm link rod for the 'SG90 Mini Delta Pick-and-Place Robot' kit. Print six, lying flat. It has two 18 mm × 8 mm cup bosses exactly 100.0 mm apart. Each boss has a 12.4 mm spherical cup, 5 mm deep with a 0.5 mm chamfered rim, that takes the kit's 12 mm printed split balls, and an 8 mm relief hole that clears the M3x40 bolt head and nut. There are 2.5 mm spring-lug holes 14 mm inboard of each cup for the springs or rubber bands that hold the parallelogram pairs onto the balls.
Delta Upper Arm
The servo-driven upper arm for the 'SG90 Mini Delta Pick-and-Place Robot' kit. Print three, lying flat. A 22 mm × 7 mm solid pad with a 5.5 mm centre hole goes on the SG90 horn, and you drill 1.5 mm pilots through the horn holes for the horn's own self-tapping screws. A 12 × 7 mm beam runs 50.0 mm to a 14 mm OD × 8.0 mm boss with a 3.4 mm hole for the M3x40 ball-joint stack. A scribed centreline helps you level the arm.
SG90 Delta Servo Cradle
An L-bracket SG90 servo cradle for the 'SG90 Mini Delta Pick-and-Place Robot' kit; print three. It has a 44 × 35 × 5 mm pad and a 24 mm tall wall with a 23.6 × 12.8 mm window for the SG90's 23 × 12.2 mm body. The tab slots take M2 screws and nuts, and two gussets carry the arm torque. The pad hangs from the top plate on M3x10 SHCS into captured M3 nuts, with ±4 mm of radial adjustment.
Delta Servo Top Plate
A 5 mm thick tri-lobe top plate for the 'SG90 Mini Delta Pick-and-Place Robot' kit, about 161 × 162 mm. Three 32 mm column pads at radius 75 mm have 20.6 mm × 1.5 mm locating recesses on the underside and 3.4 mm holes for M3x10 SHCS into the columns' heat-set inserts. Each of the three servo lobes has a pair of 3.4 mm slots, each giving ±4 mm of radial travel, so the SG90 cradles can be adjusted on M3x10 screws. The lobes also have an arm-swing notch, and the hub has a 30 mm wiring hole with a zip-tie slot pair.
Delta Frame Column
One of three 20 mm OD × 150 mm hollow columns for the 'SG90 Mini Delta Pick-and-Place Robot' kit. Each column sets the fixed distance between the base plate and the servo top plate. Each end has an 8 mm solid plug with a 4.0 × 6 mm bore for an M3 brass heat-set insert, and is fastened with an M3x10 SHCS through the plate. A 0.6 mm chamfer on each end lets the column seat fully in the plates' 20.6 mm locating recesses, and there are three 1 mm decorative flutes.
Delta Base Foot Plate
This is the 5 mm thick tri-star foundation for the 'SG90 Mini Delta Pick-and-Place Robot' kit. It has a 90 mm work pad carrying a 6 x 6 grid of 3.4 mm M3 fixturing holes at 10 mm pitch. Three 26 mm ribs join the pad to 32 mm round column feet at radius 75 mm (60°/180°/300°). Each foot has a 20.6 mm x 1.5 mm locating recess for the 20 mm columns and a 3.4 mm through-hole. On the underside, a 6.2 mm counterbore sits each M3x10 SHCS head flush, so the plate stands flat.