A maintenance schedule belongs to the printer, not to 3D printing

Maintenance is the easiest thing to skip, because the printer doesn't break at once but gets gradually worse: a ripple on the surface, a print lifting at the base, a nozzle clog you blame on the spool. All three can come from not cleaning and lubricating in the right places. The trouble is that most guides online are written as if every printer were the same — and that's where they go wrong.

Why there's no universal schedule

We read the maintenance schedules two makers publish for their own printers, and they differ in frequency, in unit of measure, and in what to do. Bambu Lab counts in months and spools printed; Prusa Research counts in print hours. On one detail, the two say exactly the opposite.

A shared structure, even if the numbers differ

What carries from one printer to another isn't the numbers but the way the work is divided. Both schedules follow the same logic: what you can see gets checked often, what needs disassembly gets done rarely, and what wears gets replaced by usage, not by time.

Before every print

• —Look at the bed and the purge scraper around the print area. A scrap of old plastic under the first layer is the most common cause of failure and takes five seconds to spot.
• —Look at the nozzle. Prusa instructs heating the nozzle to 250 °C for 3–5 minutes, then brushing with a brass brush to remove stuck plastic, and checking the nozzle has no vertical play — any tightening is done by hand, only when the printer is cold and switched off.
• —On Bambu Lab printers, look at the nozzle wiper. Its documentation calls for a check before every print: free of plastic, PTFE surface undamaged, and lying flat.

Weekly, or every 200 print hours

• —Extruder gears. Bambu Lab recommends checking and cleaning weekly, with plastic dust on the yellow gear as the sign; compressed air is the quickest fix. If the gear shows wear, replace it.
• —Fans. Dust and plastic strands on the blades cut airflow, and poor cooling is one cause of ugly overhangs — see designing parts for FDM. Switch off, blow with compressed air, and hold the blades by hand so they don't spin freely.
• —Belts. Prusa describes an ear test: pluck the belt and it should sound like a low note. A slack belt makes ripples no setting can fix, a point covered in calibrate your printer per spool.

Monthly

• —Rods and dust. Wipe with IPA on a lint-free cloth. Bambu Lab specifies spraying the alcohol onto the cloth, not onto the rod.
• —Belt idlers. Bambu Lab recommends a drop of oil only when they squeak, and avoiding oil when they don't — because oil attracts dust. Worth noting as a kind of instruction: more lubrication isn't always better.
• —Bearings and smooth motion. If pushing the toolhead by hand feels heavy or catches somewhere, clean before thinking about lubricating.

Every three months, or yearly

• —Lubricate exactly as your printer's documentation says — and only the parts it names.
• —Rust prevention. Bambu Lab recommends wiping rust-preventive oil onto the Y and Z rods every three months. In a humid climate this isn't optional: high humidity is year-round, a point made in 3D printing for outdoor use.
• —Activated carbon filter. Bambu Lab recommends replacing it every three months if the printer runs about 8 hours a day, and monthly if it runs like a production machine. A spent filter filters nothing — see 3D printing fumes and ultrafine particles.
• —Electrical connectors. Prusa puts checking and re-tightening connectors at the 600–800 print-hour mark, about once a year.

A spent filter still sits in place and still looks like a filter. That's why it gets forgotten.

Material changes the schedule, not just the settings

This is the least discussed part, and the most valuable for anyone printing a lot of engineering material. On the same printer, printing ABS or PA-CF means the maintenance schedule is no longer the PLA schedule.

The first two columns say the same thing two ways. ABS and ASA release ultrafine particles while printing, and they settle everywhere in the chamber — on rods, on camera glass, on sensors. Fibre-filled filament doesn't evaporate, it abrades: it wears the nozzle, blunts the cutter, and wears the drive gears too. Why fibre-filled filament wears things so fast is in carbon fibre vs glass fibre filament, and nozzles in the nozzle article.

What wears and what breaks

A wearing part is replaced by usage, and you should keep a spare. A broken part is replaced when it breaks. Mixing the two is how people both overbuy spares and let a blunt cutter ruin a week of printing.

On the cutter, Bambu Lab's documentation has a note worth reading: after about 5,000 to 7,000 cuts the blade may be blunt without visibly deforming. So the sign isn't the blade's shape but symptoms elsewhere — filament not retracting cleanly, feed errors. It's a failure easily misdiagnosed as a filament or settings problem, like the cases in the troubleshooting guide.

Three things the makers' documentation explicitly forbids

1. 01No grease on carbon rods. Bambu Lab is explicit about the X-axis carbon rods: grease causes abnormal drag and is very hard to clean off again. Carbon rods are designed to run dry and only need dusting.
2. 02No acetone on textured or satin sheets. Prusa states acetone causes irreversible damage on these sheets. Acetone is a solvent for ABS, not an all-purpose cleaner — more in post-processing 3D prints.
3. 03No IPA or alcohol-based solvents on the PA nylon sheet. Also per Prusa, the sheet for nylon must not be cleaned with acetone, IPA or alcohol-based solvents — while IPA is exactly what's recommended for the other sheets. Which solvent suits which part is a property of the sheet, not of the job.

A compact set of jobs to start with

1. 01

   Log print hours, not days

   The software or printer screen has total print time. Prusa's schedule counts hours because a production printer and a weekend printer can't share one cycle.

2. 02

   Do a ten-minute round every week

   Blow dust off the extruder gears and fans, wipe the rods, look at the belts and cutter. These four jobs deliver most of the benefit and need no disassembly.

3. 03

   Set a quarterly reminder for lubrication

   Only for the parts your printer's documentation names. If it says don't lubricate, then not lubricating is the job, not a job skipped.

4. 04

   Change the schedule when you change material family

   Start printing ABS or fibre-filled filament and the old schedule no longer applies. With abrasive materials, check the nozzle and cutter by spool count, not by month.

5. 05

   Record what you did right on the printer

   A sheet of paper taped to the side, with date and job. It's the only thing that answers next time's question: when were the lead screws last greased.

6. 06

   After major maintenance, reprint a test piece

   Removing and refitting the nozzle or re-tensioning belts both change measured results. Reprint a tolerance test to see whether the printer is still where it was.

One last point, and the one most often missed: maintenance isn't about keeping the printer running but keeping it running the same as yesterday. A workshop taking repeat orders lives on that sameness, which is also why calibration numbers only mean something when the mechanics hold still. If you're costing a part, maintenance consumables and the time spent on them are a real line — how to put that into the price is in how to calculate 3D printing cost.