Brick Seeder MOC Review: Gear-Driven Sowing Mechanism
The verdict up front: the signature feature of this seeder plan is "roll it and it sows." The ground wheel drives a chain to the main shaft, bevel gears spin several seed wheels, and the whole machine lands at roughly 1,800 pieces with an intermediate-to-advanced difficulty of 3.5 out of 5 stars.
Farm machinery has always been a quiet but deep corner of the brick MOC scene, and seeders sit at the top of it for pure mechanism appeal. The model reviewed here is based on a mid-size grain drill and uses around 1,800 parts to reproduce a trailed implement that genuinely sows as it moves. The overall result is a pleasant surprise.
Accuracy
The builder nailed the proportions of the real machine. At roughly 1:13 scale, the frame height and wheel track read close to a full-size grain drill, and the switch between unfolded seeding wings and the folded transport position captures how the machine actually looks in the field. The color scheme is mostly green, black and grey with a few orange warning pieces, so the agricultural feel comes through clearly. On a 10-point scale, accuracy earns an 8.5; the points lost are mainly down to a slightly simplified operator station.
The Sowing Mechanism
This is the heart of the whole MOC. The sowing unit uses a Technic gear drivetrain: the ground wheel drives the main shaft through a chain, and bevel gears on that shaft pass the drive out to several seed wheels, producing the linked "roll and sow" effect. Inside each seed wheel there is a paddle structure that drops a "seed" intermittently as it turns — a 1x1 round plate stands in for the seed — at a steady rhythm. The gear ratio has been worked out carefully, so travel speed and drop frequency match sensibly and the model feels convincing in the hand. Backlash through the drivetrain is well controlled and running resistance is low, which makes this a rare example of a genuinely working mechanism.
Seed Hopper and Chassis
The hopper holds a serious volume: the lid lifts off, the interior swallows several hundred round plates, and a transparent window in the lower body lets you check how much is left, which is a thoughtful touch. The chassis is built on a Technic beam frame with simple suspension, and the front carries a standard tow hitch that connects directly to most tractor MOCs, so compatibility is good. The one small letdown is that the unfolded seeding wings are a bit thinly supported and can pop loose during rough handling.
Parts List and Build Difficulty
The parts list comes in two formats, PDF and Bricklink XML, both clearly categorized with accurate color callouts, and the stepped bagging makes finding parts efficient. About 90% of the pieces are common Technic parts, so most builders can source them from their own stock. Difficulty is rated intermediate-to-advanced at 3.5 out of 5 stars: the chassis and drivetrain sections are densely packed and the gear meshing takes patience to dial in, but the 3D step images use clear angles and a newcomer can finish it with some guidance. The build runs in six main stages.
Wrap-Up
This seeder MOC finds a good balance between mechanical fidelity and play value. The gear-driven seed wheels, the removable hopper and the standard tow hitch all show the designer's skill, and the model works as a display piece or as a working machine. Either way, it is a highlight for any farm machinery collection. If the plan interests you, head over to brickplan for the full parts list, build guide and builder photos, and the community has plenty more farm-themed MOC plans to dig through.
FAQ
Q: How does the sowing mechanism on this seeder MOC work? A: It uses a Technic gear drivetrain. The ground wheel drives the main shaft through a chain, bevel gears on the shaft pass power to several seed wheels, and paddles inside those wheels drop seeds intermittently, so the model sows as it rolls.
Q: How many parts does the plan need, and are they easy to source? A: Around 1,800 pieces, about 90% of them common Technic parts, so most builders can complete the inventory. The plan is supplied as PDF and Bricklink XML, and the stepped bagging keeps part hunting quick.
Q: What scale is the seeder? A: Roughly 1:13. Frame height and wheel track are close to the visual proportions of a real grain drill, and the unfolded seeding wings can be switched to a folded position to match field and transport configurations.
Q: How hard is the build? A: Intermediate-to-advanced, 3.5 out of 5 stars. The main challenges are aligning the drivetrain chain and the intermittent mechanism in the seed wheels. The build progresses through six stages, and prior Technic experience makes it smoother.