Classroom Filament Budget: How Much PLA Per Term?
12 November 2026 · 6 min read · NE3D Printing
Most filament budgets in schools are guessed once, blown by Week 6, and then topped up out of someone else's line. It doesn't need to be that hard. A term's filament is a simple sum: grams per student project × students × classes, plus a contingency for the prints that fail. Here's how to do that sum properly, and what to actually order.
Step 1: grams per student project
The slicer tells you the exact number before anything prints, so make that part of the task. Having students record estimated grams and print time in their design folio is free data for you and a genuine design constraint for them.
As planning figures, before you have your own data:
- Keyring, name tag, tessellation tile: 5–15 g
- Stage 4 Technology Mandatory product (phone stand, desk tidy, bag tag, simple enclosure): 25–60 g
- Stage 5 Design and Technology or iSTEM prototype part: 60–150 g
- Stage 6 D&T major project or Engineering Studies component: 150–500 g across the project, plus test iterations that often cost as much again
Then add contingency. First-attempt failures, brims, supports, a student who scales a model to 200%, and re-prints after a bad adhesion run are not edge cases — they're a normal term. Add 25%. If you run multi-colour prints through an AMS, add more: every colour change flushes material, which can add tens of grams to an otherwise small part. For budget work, one colour per print is the frugal default.
A worked faculty example
Four classes × 28 students × 45 g = about 5.0 kg. Add 25% contingency → 6.3 kg. Add staff exemplars, demo prints, open-day pieces and repairs → round to 7–8 kg for the term. At roughly A$16–25 per kg at the time of writing, that's a plastic cost of about A$0.70–1.10 per student project. Filament is rarely what breaks a budget.
The real constraint is printer hours, not grams. A 40 g part at 0.2 mm layers typically takes 2–4 hours. Thirty of them is 60–120 machine-hours — roughly two to three weeks of near-continuous printing on a single printer. Budget your term around that number first. Our A1 mini vs A1 vs P1S guide covers how many machines a faculty realistically needs.
Step 2: PLA or PETG?
For most Stage 4 and Stage 5 work, PLA+ is the correct answer and PETG is a distraction. PETG earns its place when the part has to survive a car dashboard, a sunny window, outdoor use, or repeated load — which is more common in Stage 6 and in iSTEM functional prototypes.
| PLA+ | PETG | |
|---|---|---|
| Nozzle | 200–225 °C | 230–250 °C |
| Bed | 50–60 °C | 70–80 °C |
| First-print success | Highest — forgiving | Good, but stringier and fussier |
| Moisture sensitivity | Moderate | High — dry it, especially after a humid summer |
| Finishing | Sands and paints well | Gummy to sand; prefer as-printed |
| Toughness / heat | Brittle under sharp load; softens in a hot car | Flexes before breaking; better outdoors |
| Use it for | The bulk of class sets | Functional parts, jigs, outdoor tests |
A sensible faculty split is roughly 80% PLA+, 20% PETG. Browse PLA & PLA+ and PETG, or the full NE Filament range. If you run an AMS and want RFID spools recognised automatically, Bambu Lab PLA Basic and PETG Basic sit alongside it — we sell Bambu Lab at Bambu AU's price, with the support handled here in NSW.
Step 3: 10-pack or single spools?
The NE Filament PLA+ 10-pack is sized almost exactly to the term example above. Its real advantage is administrative, not just unit cost: one line on one purchase order, one delivery to receive, one colour to profile, and no mid-term "we've run out" email to your business manager.
Single spools still make sense for colour variety (student choice matters for engagement), for PETG where usage is lower, and for specialty finishes used sparingly on final presentation pieces. A practical term order looks like:
- 1 × PLA+ 10-pack as the workhorse
- 2–3 single spools for accent colours — e.g. White, Blue, Red
- 1–2 × PETG for functional work — Black or Grey
Step 4: storage and drying (where budgets quietly leak)
Filament bought in Week 1 and left open on a bench until Week 8 is not the same filament. Wet material pops and crackles at the nozzle, strings, prints rough, and makes weak parts — so you pay twice through re-prints.
- Store sealed. Airtight tubs with fresh desiccant, lid on, out of direct sun. Aim to keep spools well under 20% RH; a cheap hygrometer in the tub tells you when the desiccant is spent.
- Dry before a big run. Typical settings are PLA around 45–50 °C for 4–6 hours (stay well below the temperature where PLA starts to soften) and PETG around 60–65 °C for 6–8 hours. A desktop unit like the SUNLU S2 Filament Dryer can also feed a printer while drying. More options in Filament Care.
- Label everything with term, class and remaining weight. Weigh a spool, subtract the empty spool weight, and you have your remaining grams — a good 10-minute numeracy task.
Safety and sign-off
Be conservative here. Hot ends run 200–260 °C and beds up to 80–100 °C, both of which will burn a student who reaches in. FDM printers also emit ultrafine particles and VOCs — lower with PLA, higher with ABS and ASA. Practical risk controls: keep printers enclosed where possible, site them in a well-ventilated room rather than a sealed store room or office, keep ABS/ASA out of unventilated classrooms, place machines where students can't reach a moving toolhead, and supervise. We can't tell you what is "compliant" at your site — run this through your school's own WHS and risk-assessment process and your WHS nominee, and keep your filament safety data sheets with the machine.
What to buy
- Standard term kit for one faculty: 1 × NE Filament PLA+ 10-pack, 2–3 accent single spools, 1 × PETG Black, 1 × filament dryer and sealed storage tubs.
- Small cohort or a single printer: start with 3–4 single PLA+ spools, track your real grams for one term, then scale to a 10-pack.
- Setting up from scratch: see the starter classroom kits, which pair a printer with consumables and spares.
Schools can request a quote or send a purchase order through our Schools & STEM page, or apply for a trade account for NET30 on an approved account. Orders placed before 12 pm dispatch the same day, and because we're based in Casula in south-west Sydney, warranty, spare parts and "it's making a noise" phone calls are handled locally rather than overseas.
