Skinny B — Manual Pre-Roll Process Development Case Study
A documented development project focused on repeatable manual production, fill consistency, compaction, airflow, closure methods, material handling, and measurable process improvement.
Develop a repeatable manual production method for a 1.0g pre-roll format while controlling fill weight, compaction, airflow, closure quality, burn performance, and operator workflow.
Skinny B used a 109 mm format with a 9 mm tip and approximately 1.0g finished fill. Multiple paper, hemp-wrap, glass-tip, and wood-tip configurations were tested during development.
Skinny B served as a controlled development platform for studying production variables and establishing a measurable manual baseline that could later inform equipment selection, process improvement, and automation.
Initial Production Problems
Early Skinny B builds exposed several problems that prevented the process from being repeatable or production-ready. These failures established the variables that later trials needed to control.
Coarse Grind — Early material around 5 mm worked for hand rolling but did not flow consistently into the tube format.
Repeated Fill Stages — Some early builds required roughly five separate fill and compaction stages to reach finished weight.
Inconsistent Compaction — Bounce compaction alone did not reliably establish the desired pack density.
Over-Compaction — Weighted rod compaction created dense areas that contributed to restricted airflow and uneven burn behavior.
Compaction Rings — Concentrated compression created visible density changes through the product column.
Canoeing & Burn Defects — Burn testing showed that inconsistent particle size and compaction could produce uneven combustion.
Poor Production Repeatability — Too many manual corrections and operator-dependent steps prevented the early method from becoming a reliable production baseline.
Development Method
The process was revised through controlled changes to material preparation, filling, compaction, closure, and operator sequence. Each change was evaluated against finished weight, handling, airflow, burn behavior, and repeatability.
Material Preparation — Flower was processed to approximately 2.5 mm maximum particle size, with stems and unsuitable material removed before production.
Conditioning — Prepared material was rested with controlled humidity before filling to improve handling consistency.
Clutch Formation — A measured initial charge was compacted near the tip to establish a controlled starting density.
Progressive Filling — Material was added in stages rather than forced into the full tube at once.
Controlled Compaction — Bounce cycles and light mechanical tamping replaced the earlier heavy weighted-rod method.
Weight Verification — Each unit was built on a scale so finished fill could be monitored during production rather than only after completion.
Closure Development — Twist and Dutch-crown methods were refined to produce repeatable closures without disturbing the product column.
Burn Testing & Feedback — Finished units were evaluated for airflow, canoeing, compaction rings, burn rate, and general handling performance.
Four five-unit trials were used as the primary comparison set. Each trial recorded production time and available weight data to compare material handling, fill control, and manual process performance.
Five-unit trial completed in 11:36, projecting approximately 25.9 units/hour at the observed pace. Wood-tip mass varied enough that gross finished weight could not reliably indicate net flower weight. The trial established the need for tare/net control when natural wood tips are used.
Five-unit one-at-a-time trial completed in 13:20, projecting approximately 22.5 units/hour. Net fills were 1.05, 1.03, 1.04, 1.06, and 1.08 g, with a 0.05 g spread. The result demonstrated that the manual process was practical without major mechanical assistance.
Five-unit trial completed in 11:38, projecting approximately 25.8 units/hour. Net fills were 1.01, 1.02, 1.00, 1.03, and 1.00 g, with a mean of 1.012 g and a 0.03 g spread. This became the strongest measured fill-consistency baseline.
Five-unit trial completed in 10:50, projecting approximately 27.7 units/hour. Gross finished weights were 2.00, 2.00, 1.97, 2.02, and 2.06 g. Because natural wood-tip mass was not tared, net flower-fill variation could not be isolated; the faster time reflects overall process maturation rather than a single material advantage.
Early production failures were converted into controlled process changes. Material preparation, filling, compaction, weight control, closure, and operator sequence were revised until the method produced more consistent results with fewer corrective steps.
The early coarse grind was replaced with a screened preparation targeting approximately 2.5 mm maximum particle size, improving material flow and reducing large particles that interfered with filling.
Heavy weighted-rod compaction was replaced with controlled bounce cycles and light tamping. The goal shifted from forcing density into the product to building a consistent product column without restricting airflow.
Units were produced directly on a scale so fill weight could be monitored during construction. Glass-tip configurations provided the clearest net-fill data, while natural wood-tip variation demonstrated the need for tare control.
The process moved toward one-piece flow, allowing each unit to progress through filling, compaction, weight verification, and closure as a complete production cycle rather than relying on repeated batch corrections.
Twist and Dutch-crown methods were refined alongside burn testing. Closure quality, airflow, canoeing, compaction rings, and handling performance became part of the production-development criteria rather than being checked only after the process was finished.
Final Process Baseline
Development established a repeatable manual method that could serve as a reference point for future equipment evaluation, process transfer, and automation. The baseline was defined by measurable production controls rather than a specific machine.
Prepared Material — Screened material with controlled particle size and conditioning provided more predictable filling behavior.
One-Piece Flow — Each unit progressed through filling, compaction, weight verification, and closure as one complete production cycle.
Scale-Based Weight Control — Fill weight was monitored during production, allowing variation to be identified before the unit was finished.
Controlled Compaction — Light, repeatable compaction replaced force-heavy methods that had contributed to airflow and burn defects.
Standardized Closure — Repeatable twist and Dutch-crown methods completed the unit without disrupting the established product column.
Measured Performance — Production time, finished weight, burn behavior, airflow, and operator handling were used to judge whether the process was actually improving.
Skinny B demonstrates how Lag Labs approaches manufacturing problems: establish a baseline, identify failure points, change one or more controllable variables, measure the result, and document the process that performs best.
Production quality was improved through material preparation, operator sequence, weight control, compaction, and closure methods before relying on additional machinery.
Production time, fill weight, airflow, burn behavior, handling, and repeatability provided objective evidence for deciding whether a process change was actually an improvement.
The development method is not limited to Skinny B. The same approach can be applied to other pre-roll formats, production equipment, facility layouts, and throughput targets.
Establishing a successful manual cycle creates a known process that can later be translated into tooling, equipment settings, operator stations, or automated production steps.
The project demonstrates Lag Labs' core role: converting production problems into measurable variables, testing practical solutions, and establishing repeatable manufacturing methods.