Bed surface

The G1 print bed uses a 6 mm tempered glass plate as the standard print surface. The glass sits on the heated aluminum bed plate. Different materials require different adhesion strategies on this surface.

Standard surface: tempered glass

Parameter	Value
Material	Tempered glass
Thickness	6 mm
Size	120 × 120 cm

Pros

Flat, rigid, dimensionally stable
Easy to clean
Gives a smooth bottom face on prints

Cons

PETG bonds extremely strongly to glass without a release agent — can damage the glass when the part is removed
Requires adhesion spray for most materials to prevent warping

Adhesion by material

PLA / rPLA

Bed temperature: 40–65°C (lower is often better to avoid warping)
Apply Dimafix, MagiGoo, or a light coat of glue stick
PLA sticks “like rock” to glass at 40°C with proper spray; when the bed cools below 30°C, parts often release on their own
If first layers are milky or lifting: bed temperature is too high — lower to 40–50°C

PETG

Always use a release spray (Dimafix or Rain-X automotive water repellent spray) — without it, PETG bonds so strongly it can crack the glass when the part is removed
Bed temperature: 75–80°C (up to 80°C for better adhesion)
Apply spray in a thin, even coat with a paper towel; re-apply when the surface becomes too oily or loses tackiness
Large flat PETG parts: add 2+ lines of inner + outer brim in the slicer

PP (polypropylene)

PP is notoriously difficult to adhere; tested solution: use a PP sheet (2 mm) glued to an aluminum plate as the bed surface
Bed temperature: 80°C
Standard glass adhesion does not work reliably for PP

Alternative surfaces (tested by customers)

Fiberglass / FR4 sheet

8–10 mm thick fiberglass (resin-based composite)
Works well for PETG: provides a non-shiny surface texture, good release
Does not require adhesive spray

Custom PP bed

For PP pellet printing: a 2 mm PP sheet bonded to a 10 mm aluminum plate
PP adheres to PP by nature, solving the adhesion problem

G10 / FR4 glass fiber sheet (4 mm)

Tried by at least one customer as a glass replacement: 120 × 120 cm, 4 mm thick G10 glass fiber composite
Results not extensively documented — treat as experimental

Not recommended: aluminum directly

Aluminum bonds with heat and is very hard to remove printed parts from — not a viable surface

Replacing the glass

The standard glass plate can be sourced locally from any glazier or glass supplier. Replacement specification:

Parameter	Value
Material	Tempered glass
Size	120 × 120 cm
Thickness	6 mm
Estimated cost	50–70€ from a local glass cutter

Order from a local glass supplier with the exact dimensions. Tempered glass cannot be cut after tempering — order to size.

Surface preparation procedure

This is the official procedure confirmed by the Ginger Additive support video “G1 Bed Level & Prep Surface”:

Clean glass bed overview before surface preparation begins

Move the extruder to the back of the machine using the display Move menu — this frees up space to work on the glass

KlipperScreen Move screen — use this to position the extruder out of the way before cleaning

Scrape off print residue with a plastic spatula (yellow squeegee) — remove any leftover material from the previous print

Scraping the glass bed with a yellow squeegee to remove print residue

Apply glass cleaner (spray or liquid) over the surface
Wipe clean with a cloth or paper towel until the glass is dry and residue-free

Applying glass cleaner to the bed surface

Apply the correct adhesion product for the material you are printing:
- For PETG: apply RainX (automotive water repellent) as a release agent — prevents the part from bonding too strongly to the glass
- For PLA / rPLA: apply hairspray (lacca spray) as an adhesion promoter — confirmed by official Ginger video

Applying RainX to the glass bed for PETG printing

Applying hairspray to the glass bed for PLA printing

Let the product dry before heating the bed — do not spray onto a hot bed
The bed is now ready to print

Glass bed fully prepared and ready for printing

Cleaning the glass

Clean with isopropyl alcohol (IPA) between prints
Remove adhesive spray buildup periodically with hot water and a sponge
Do not use acetone — it can etch the glass surface treatment