Resin build plate leveling makes the plate sit parallel to the LCD screen and tells the printer where Z zero is, so the first layers are cured at the right distance from the vat’s film and stick to the plate instead of the vat. On most printers you do it with a sheet of paper: loosen the plate screws, lower the plate onto the paper, tighten the screws, check that the paper pulls out with slight resistance, and save that height as zero.
If prints still come off the plate after that, leveling is only one of four suspects: loose screws, too little bottom exposure, a cold room and a damaged vat film are the others. This guide gives the leveling procedure from Elegoo and Anycubic documentation, which printers level themselves, hedged starting points for bottom layers and bottom exposure, and a diagnosis table for prints that stay on the film. Sources are linked at the end.
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Leveling in 8 steps
- Empty the vat and take it off the printer. Clean the plate and the screen.
- Loosen the plate screws so the plate can move freely.
- Put a sheet of paper flat on the screen.
- Use the printer’s Home or Z-axis zero function to lower the plate onto the paper.
- Press the plate gently so it sits evenly on the screen and tighten the screws.
- Pull the paper: slight, even resistance is right. If it will not move, raise Z by 0.1 mm; if there is no resistance, lower Z by 0.1 mm (Elegoo).
- Save the position as Z zero and confirm, then raise the plate and remove the paper.
- Run the screen test if your printer has one, refit the vat and print a small model.
Which printers need manual leveling
Menu names differ, and not every printer works this way. The documents we checked describe two situations:
| Type | Example from maker documents | What you do |
|---|---|---|
| Manual, paper method | Elegoo Mars Pro (M5 wrench, A4 paper); Anycubic Photon Mono X2 (four screws, leveling paper) | Follow the steps above; menu wording varies |
| Automatic, sensor-based | Elegoo Saturn 4 Ultra: build plate with built-in leveling shims and springs plus a mechanical sensor | Press the leveling button; the printer warns if leveling fails |
Elegoo’s Saturn 4 Ultra page says the plate is leveled automatically every time you click the button and that the printer alarms on a leveling failure. Even then, the other adhesion causes in this article still apply. Check your printer’s manual before assuming you can skip the paper.
The paper method in detail
Elegoo’s Mars Pro guide uses an M5 L-type wrench and A4 paper. You tighten the knob, loosen the screws, slide the paper under the plate, home the Z axis, center the plate and tighten the screws, starting with screw 1 and then screw 2. Anycubic’s Photon Mono X2 guide works the same way with four screws: place the leveling paper on the LCD, press Home, press lightly on the plate so it sits evenly, tighten the four screws, select Z=0 to save the position and confirm. Neither document gives a paper thickness; Anycubic describes the target as slight friction.
Three details cause most leveling failures. First, loosen the screws before you lower the plate, otherwise the plate cannot self-align on the paper (Elegoo’s troubleshooting article lists it as a check). Second, retighten the screws afterwards: Anycubic warns that leveling will not hold otherwise. Third, press the plate down evenly while tightening, because a plate that tilts while you tighten leaves one edge too high or too low.
Afterwards, Anycubic suggests a screen check: raise the plate until the screen is visible, run the Detection test and confirm the LCD shows a complete image. A missing patch on that test explains a bare patch on your first layer.
How often to re-level
Anycubic treats leveling as a first-use step and part of routine maintenance, with no fixed interval. Elegoo says you do not need to repeat it in the short term unless screws loosen, the plate gets displaced or printing problems appear. As our own rule of thumb rather than a maker figure, re-level after you replace the plate, the screen or the vat film, and after you move or knock the printer.
Bottom layers and bottom exposure
The bottom layers are the first few layers that are exposed far longer than the rest so the model bonds to the plate. In Chitubox these are the Bottom Layer Count and Bottom Exposure Time; the Transition Layer Count then ramps the exposure down from the bottom value to the normal one. The published examples show a wide spread, so start from your resin’s profile for your printer:
| Source | Bottom layers | Bottom exposure | Condition |
|---|---|---|---|
| Anycubic | Around 6 | About 40 s on a drawing platform; about 25 s on a laser-engraved platform | Anycubic resin, Anycubic printers |
| Elegoo (original Mars) | 5 | 60–70 s for most colors; 70–75 s for Translucent; 90 s for Maroon and Black | Elegoo’s example; other printers follow their own resin sheet |
| Elegoo, large or heavy models | 5 | 70 s or even 75 s | Longer bottom exposure improves adhesion |
| Elegoo, cold print environment | Per resin sheet | Add about 10 s to the recommended value | Lower temperature weakens adhesion |
Two things follow from that table. The plate surface changes the number: Anycubic gives a shorter value for a laser-engraved platform than for a drawing platform. And bottom exposure is a separate setting from normal exposure, which you calibrate with a resin exposure test. Raise the bottom value in small steps; a very long one tends to widen the base and make the print harder to remove, which is a general effect rather than a maker figure.
Prints stuck on the film or falling off the plate
Read what is on the plate and in the vat before you change anything. This table pairs each symptom with the cause and fix that the maker documents or basic mechanics support.
| Symptom | Likely cause | Fix |
|---|---|---|
| Plate is clean, a cured sheet is stuck to the film | Plate too high (Z zero wrong), loose screws, or too little bottom exposure | Re-level, retighten, then raise bottom exposure in small steps |
| Print attached on one side only | Plate tilted while tightening, or debris under the plate or on the screen | Clean, re-level and press evenly while tightening |
| Prints fail in a cool room, fine in a warm one | Cold resin is thicker and adheres less | Warm room and resin, add about 10 s bottom exposure (Elegoo); Anycubic says resin will not cure properly below 10 °C |
| Base is wider than the model and hard to remove | Bottom exposure too long, or plate set too close | Shorten bottom exposure; recheck the paper test |
| Print drops mid-height, base still on plate | Supports too light for the model, not a leveling problem | Heavier supports; Siraya Tech suggests Chitubox Medium for small and Heavy for large or heavy prints |
| Cured chips or cloudy patches on the film | Debris or a damaged film | Check the film; Anycubic suggests an IPA leak test and notes cured resin on the LCD means a damaged film |
| Resin on the screen after the vat is off | Film punctured | Stop printing and replace the film |
Elegoo’s troubleshooting order for a model that will not stick is: check the official resin settings, level (loosening the screws first), add bottom exposure in a cold room, then adjust exposure. If that fails, Elegoo asks for photos or a short video of the problem.
Plate surface and cleanliness
Resin plates are made rough on purpose. Elegoo describes the Saturn 4 and Saturn 4 Ultra plate as dual-sided, black, sandblasted and laser-carved, and says the Saturn 4 Ultra’s plate has excellent adhesion. Cured resin or a film of oil on that surface will cost adhesion, so wipe the plate with IPA between prints and check it before a failed print is repeated. We found no maker guidance on sanding a plate, so do not roughen it yourself unless the manufacturer says to.
What to do next
A level plate and sticking bottom layers are the first half of a good print. Next, calibrate normal exposure with the exposure test, settle layer height with the layer height guide, and if this is a new printer, follow the first resin print guide. If you came here with a filament printer, the equivalent is leveling an FDM bed.
Frequently asked questions
How tight should the paper be when leveling a resin printer?
Slight, even resistance. Anycubic describes it as slight friction and Elegoo says leveling is done when the paper slides out with slight resistance. If the paper will not move, raise Z by 0.1 mm; if it slides freely, lower Z by 0.1 mm.
Do I need to level before every print?
No. Elegoo says you do not need to repeat leveling in the short term unless the screws loosen, the plate shifts or problems appear, and Anycubic describes it as a first-use and routine maintenance step. Re-level after anything that moves the plate.
Why does my print stick to the FEP film instead of the build plate?
Common causes are a plate set too high, loose screws, too little bottom exposure and a cold room. Re-level and retighten first, then raise bottom exposure in small steps and warm the room or resin.
Do I still need to level a printer with automatic leveling?
Elegoo’s Saturn 4 Ultra levels the plate with a sensor each time you press the button and alarms if it fails. If prints still fail, the cause is usually bottom exposure, temperature or the vat film, so check those before assuming the sensor is wrong.
Sources
- Elegoo: Mars Pro, level the build plate
- Anycubic: How to level the Photon Mono X2 and common parameters description
- Elegoo: Model sticking to the FEP rather than the build platform
- Elegoo: Saturn 4 Ultra and build plate for Saturn 4 and Saturn 4 Ultra
- CHITUBOX Basic docs: Configure print parameters and Anycubic: When and why to replace FEP film
- Siraya Tech: Fast resin user guide
