EDGEBIC for 3D Printing: Scheduling Printer Pools and Long Builds

EDGEBIC schedules additive manufacturing by pooling identical printers into a work center group that jobs target as a unit, and by planning the long unattended builds across multiple shifts, so a queue of builds spreads across the pool automatically and a 30-hour print runs straight through the night instead of stopping at the end of a shift. EDGEBIC by User Solutions brings finite-capacity scheduling to a production method whose two defining traits, interchangeable machines and very long build times, are exactly what casual scheduling handles worst. This post shows how the fit works.

Two Things That Break Ordinary Scheduling

Additive manufacturing has two characteristics that trip up most planning approaches.

First, printers in a class are interchangeable. A shop with eight identical machines does not care which one runs a given build, only that some machine runs it. But most scheduling forces you to assign each job to a specific machine, so a planner ends up playing traffic cop every morning, hand-assigning builds and rebalancing whenever a machine goes down.

Second, builds are long and run unattended. A single part might take fourteen, twenty, or thirty hours, and the whole economic model of additive depends on machines running lights-out overnight. Scheduling that quietly assumes work stops at the end of a shift produces finish dates that are simply wrong for this method.

EDGEBIC addresses both directly.

Work Center Groups: The Printer Pool

The first fit is the work center group, a named pool of interchangeable machines that a job targets instead of a single named machine. Put your eight identical printers in one group, and route builds to the group rather than to machine number three. When the schedule runs, the engine selects an available printer from the pool by the group's strategy, and it never overbooks a machine.

The result is automatic load balancing. A queue of builds spreads across the pool without a planner assigning each one. And when a printer goes down, its queued builds re-shop to the rest of the pool on the next scheduling run rather than stranding a backlog behind a dead machine. The general concept is covered in what is a work center group, and the mechanics in EDGEBIC work center groups.

Not every printer in a shop is identical, of course. A work center group lets each member carry an efficiency factor, so a faster machine finishes the same build sooner and a slower one takes longer, and the scheduler accounts for that both when picking a machine and when computing the finish time. If some builds require a large-format machine, you keep those machines in their own group so only compatible builds target them.

Multi-Shift Scheduling: The Overnight Build

The second fit is multi-shift scheduling. Build times in additive routinely exceed a single shift, so a scheduler that stops work at the end of a shift is useless here. EDGEBIC schedules across shifts, and it plans a build that starts in the afternoon straight through the night as one continuous run.

You define the shift calendar the printers follow, including overnight lights-out coverage, and the engine allocates each build across those hours. A thirty-hour build starting Monday afternoon is planned through Monday night and into Tuesday, because the calendar says the printers run unattended overnight. Your promise dates then reflect how additive actually operates, not an artificial nine-to-five stop. The general mechanism is covered in EDGEBIC multi-shift scheduling.

A Worked Example: A Day at an Eight-Printer Shop

Consider a service bureau with eight identical printers in one pool, running a lights-out calendar: a day shift plus overnight unattended coverage. On Monday morning the queue holds five builds with these estimated run times:

With hand assignment, a planner would spend the morning deciding which build goes on which of the eight machines, then rebalancing the moment a rush job arrived or a printer faulted. With EDGEBIC, all five builds route to the printer pool. The engine assigns each to an available machine by earliest completion, spreading them across the eight printers so no machine is double-booked and the longest builds start first where that gets the queue done soonest.

Because the calendar includes overnight lights-out hours, build A's thirty-hour run is planned straight through Monday night into Tuesday, and build E's twenty-six hours likewise. None of them stops at the end of the day shift. The planner opens a schedule that is already balanced across the pool and already accounts for the overnight running, and reviews it rather than building it by hand.

If printer three faults on Tuesday, its in-progress build is preserved as actual work, and its not-yet-started queue re-shops across the remaining seven printers on the next run. The queue does not pile up behind the dead machine.

Keeping Promise Dates Honest

The payoff of getting both traits right is honest promise dates. A service bureau lives or dies on telling a customer when a part will ship. If the schedule assumes work stops overnight, every promise is pessimistic and you lose bids. If it ignores that printers are shared and hand-assigns everything, the schedule falls apart the first time a machine goes down. EDGEBIC's combination of a printer pool and multi-shift running gives you a finish date that reflects both realities: the build ran on whichever machine was free, across whatever hours the printers were actually running.

Beyond the Printers

Additive parts rarely ship straight off the build plate. There is depowdering, support removal, heat treatment, machining of critical features, and inspection. EDGEBIC models the whole flow as a multi-step routing, with each step targeting the right work center or pool, and schedules the steps in dependency order. The long print is one step in a chain, and the schedule accounts for the post-processing that follows it, so your finish date reflects the finished part, not just the print.

For a shop scaling up an additive operation, the scheduling question is not whether the printers are busy. It is whether the queue is balanced across the pool, whether the overnight hours are being used, and whether the post-processing is planned. EDGEBIC answers all three, and the broader picture of scheduling this method is covered in the general 3D printing scheduling overview. The starting move is to define your printer pool and your lights-out calendar, and let the engine balance the queue you have been balancing by hand.