Print a Tagback on a Prusa Printer

Prusa printers with MMU3 do the multi-color Tagback print reliably with their stock profile. Tested on MK4, MK3.9, MK3S+, and XL. ~15 minutes start to first scannable tag.

What you need

• Prusa MK4 / MK3.9 / MK3S+ / XL / CORE One / Mini+. MMU3 strongly recommended for multi-color.
• PrusaSlicer 2.7+ (free, latest).
• Two spools of PETG. Prusament PETG is the gold standard — any third-party works too.
• Tagback 3MF from the dashboard

Workflow — 9 steps

1. Tagback dashboard → tag → Designer → 3D Tag mode.
2. Pick variant (Round Small / Round Large / Luggage) and color pair.
3. Download 3MF.
4. Open PrusaSlicer. Drag the 3MF onto the bed. The two color regions auto-load.
5. Select your printer profile (MK4, MK3.9, etc.). Filament: Prusament PETG (or Generic PETG).
6. Walls 4 (Perimeters in PrusaSlicer's terminology). Infill 30% gyroid. Top/bottom 5/5. Supports: none.
7. If using MMU3: confirm both Filament 1 and Filament 2 slots are assigned to the right colors. PrusaSlicer's prime tower is enabled by default — keep it at 35×35 mm.
8. Slice → preview. You'll see the color swap at the layer where the QR raise begins.
9. Export G-code to USB / Prusa Connect → print. MK4: ~14 min. MK3.9: ~16 min. MK3S+: ~18 min.

Per-printer notes

MK4 / MK4S

Input shaper makes small detail printing crisp at default speeds. Use the Quality profile, not Speed — Speed introduces visible ringing on the QR raise. Textured powder-coated PEI bed: no glue, PETG adheres beautifully and pops off when cool.

MK3.9 / MK3S+

Slower than MK4 but rock-solid. Generic PETG profile works. If your MK3S+ has the original brass nozzle, no issue — PETG doesn't wear brass. Watch first-layer height — calibrate via Live Adjust Z if anything looks rough.

Prusa XL (with up to 5 toolheads)

The XL is overkill for a 35mm tag, but you can batch-print 20 tags in one run with 5 different color combos using different toolheads — great for animal rescue groups. No prime tower needed since each toolhead is independent.

Prusa Mini+ / Mini

Fits all three variants. No MMU3 compatibility — print single-color, or use the manual filament-swap technique (PrusaSlicer inserts a pause at the color-change layer). The Mini's 180×180 mm bed fits 6 small tags at once.

Prusa CORE One

Enclosed chamber helps PETG layer adhesion — slight edge over MK4 for outdoor-grade durability. Same profile as MK4.

MMU3 specifics

The Tagback 3MF has exactly two color regions, which is the easiest MMU3 case. Setup:

1. Load both spools into MMU3 slots (any two of the five slots).
2. In PrusaSlicer: Settings → Multi-material → Wipe tower. Position it 35 mm from the print, size 35×35.
3. Enable Wipe into infill — saves filament on the prime tower.
4. Print. MMU3 swaps once per color change layer, ~30 sec per swap.

If you've never run MMU3 before, do Prusa's calibration print first — once tuned, it's reliable for hundreds of prints.

PrusaSlicer settings cheat-sheet

Single-extruder Prusa (no MMU3)

PrusaSlicer supports manual filament change. Right-click the slice preview at the layer where QR begins → Add Custom G-code → M600. The printer pauses, you swap spools, resume. About 60 seconds of human work, no MMU3 needed. Many users do this on a Mini+ or MK3S+ without MMU3 — works fine for a single tag.

Common issues

Tag fish-eyes (small dot on top surface)

Caused by retraction lift slightly too high. Reduce Z-hop to 0.2 mm.

Print won't stick to PEI

PEI loves to be clean. Wipe with isopropyl 90%+. Don't touch with bare fingers. Calibrate first-layer Live Adjust Z.

MMU3 jam at the splitter

Prusa knows this — run the latest firmware. If still jamming, the FINDA optical sensor may need cleaning (compressed air). Many third-party PETG spools have inconsistent diameter; switching to Prusament solves most MMU3 issues.

FAQ

Keep reading

• How to 3D print a QR pet tag (full guide)
• Best filament for pet tags
• Slicer settings deep-dive
• Bambu Lab + AMS walkthrough