Anycubic Kobra 3 Max Build Plate: The 430 mm Sheet, and Which Replacements Fit
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The Kobra 3 Max takes a plate around 430 by 430 mm, sized for its 420 mm bed; the standard Kobra 3 plate is far smaller and will not fit. Buy a thick textured PEI plate, because a sheet this size bows on the magnets if it is thin, and keep PETG on the textured side. A smooth side is optional for glossy PLA.
The Kobra 3 Max is a large open bed-slinger, and its plate has the same challenge as every big bed-slinger plate: staying flat across 420 mm while the bed slings back and forth. The ACE Pro multi-material unit adds PLA colours but does not change the plate rules. Thickness first, coating second.
Where to buy
What to check
- Listed for the Kobra 3 Max, around 430 by 430 mm. Plates for other printers do not fit.
- Spring steel 0.5 mm or thicker so the plate stays flat on the magnets.
- Coating thickness stated; the Max prints mostly PLA and PETG in the open, so flatness and thickness matter more than coating longevity.
- Double-sided if you want smooth PEI as well as textured on one sheet.
Surface by material
- PLA: textured or smooth PEI, 55 to 60 °C.
- PETG: textured PEI, 70 to 80 °C; smooth PEI only with a glue-stick release layer.
- TPU: textured PEI, 40 to 50 °C.
- ABS and ASA: not practical on an open Kobra 3 Max beyond small parts; textured PEI at 100 °C with glue and a warm room, and expect lifting.
The plates in the box
The upgraded double-sided PEI plate for the Kobra 3 Max and the 430 by 430 mm gold PEI plate listed for it are the two replacements sized for the Max.
Swapping
- Wash the new plate with dish soap and hot water; dry; handle by the edges.
- Seat it against the rear stop on the magnetic bed.
- Run the printer’s auto-leveling so it measures the new plate; smooth and textured differ by a couple of tenths in Z.
- If the first layer will not stick, wash again before changing anything; see smooth versus textured.
FAQ
Do Kobra 3 plates fit the Max? No; the Kobra 3 is 250 mm.
Does the ACE Pro change anything about the plate? No; it feeds filament. The plate rules are the printer’s.
Why do large PETG parts lift at the corners? A cold edge on a big bed or a greasy plate. Preheat longer, wash the plate, add a brim.
LayerWalker
Print defect diagnosis, calibration procedures and parts that actually fit. Corrections welcome through the contact page.
