3D Print Settings for Neon Sign Channels: Material, Walls and Fit

By the Volucore teamUpdated October 1, 2026 4 min read

A neon sign channel is a long, thin, shallow print, which is easy for most printers but has a few details that matter: the wall must be the right thickness, the channel must come out the right width, and the pieces must stay flat. These are the settings we recommend starting from, and how to adjust them for your printer.

Nine 3D-printed neon sign channel pieces in different colours lying on a dark printing plate, each with a number tag.

Starting settings

Starting points, not rules. Tune them on the fit test piece.
Setting	Start with	Why
Nozzle	0.4 mm	The tool’s wall thickness (1.6 mm) is four lines of 0.4 mm.
Layer height	0.2 mm	A good balance. Use 0.16 mm for a smoother surface.
Wall count	4 perimeters	Matches the 1.6 mm wall of the model with a 0.4 mm line width.
Top and bottom layers	3 to 4	The base is 2 mm thick, about 10 layers at 0.2 mm.
Infill	10 to 20%	There is little to fill; the walls and base do the work.
Supports	None	Pieces are designed to print flat with the base down.
Brim	Optional	Helps long, thin pieces stay flat on a cool bed.

Material

Filament	Good for	Watch out for
PLA	Most indoor signs. Easy, accurate, stiff.	Softens in hot places; avoid a sunny window or a closed car.
PETG	Warmer rooms, tougher pieces.	Can string; slightly less crisp dovetails; tune retraction.
White or light colour	Bright glow: light reflects inside the channel.	Shows layer lines more.
Black or dark colour	A dark frame around the glow; hides the strip off.	The channel absorbs some light; paint it white if you want it brighter.

Choose opaque filament. A translucent filament lets light leak through the walls, which can look interesting but makes the glow less defined and the sign harder to control.

Orientation and bed

Print every piece flat with the base on the bed. That gives the best strength along the channel and needs no supports. Make sure the bed is level and clean: a long, thin piece shows a poor first layer more than a block does. If a piece lifts at the ends, use a brim, a slightly warmer bed or a cleaner plate.

Get the channel width right

The channel is designed to be the strip width plus the fit clearance, 6.40 mm for a 6 mm strip at the default 0.40 mm. Whether it prints at exactly 6.40 mm depends on your printer. Common causes of a channel that is too narrow are over-extrusion and a first layer that is squashed too much (“elephant foot”), which narrows the bottom of the channel. A channel that is too wide usually means under-extrusion or a loose belt.

Print the fit test piece from the tool with your intended settings.
Press a piece of your strip into it. It should go in without force and not fall out.
If it is too tight, raise the fit clearance in the tool by 0.1 mm; if too loose, lower it by 0.1 mm.
When it fits, print the whole sign with the same slicer settings.

Dovetail connectors

The hidden connectors have their own clearance in the tool (0.15 mm per side by default). If two pieces will not push together, increase the clearance a little; if they wobble, reduce it. Print two neighbouring pieces and test them before printing the rest. Do not force a joint: if the keys are slightly tight, a light sanding of the key is better than hammering the pieces together.

Print order and time

Start with the largest piece, so any problem shows early.
Print pieces in one go if your plate allows it; otherwise print by number.
Keep the numbers: write the piece number on the back with a marker, or use the engraved numbers from the tool.

Surface finish and layer lines

Layer lines show most on the outside of the walls and along the top edge of the channel. Finer layers, such as 0.16 mm, soften them; sanding and a coat of paint hide them. The inside of the channel is covered by the strip, so its surface matters less than the rim, which is the part you see from the front.

Speed and cooling

Long, thin walls can show ringing, a ripple behind sharp corners, when printed fast. Start with your printer’s standard quality profile and slow the outer walls and the first layer a little. Use normal part cooling for PLA; for PETG, use less cooling and a slightly slower speed for good layer bonding.

Dry filament

Damp filament strings and prints rough, which spoils the edges of the dovetails and the rim. If the plastic pops or you see tiny bubbles on the surface, dry the spool before you print the sign.

Common problems

Problem	Fix
Strip does not fit	Increase fit clearance; check for elephant foot.
Warped ends	Brim, cleaner or warmer bed, slower first layer.
Stringing between letters	Lower the nozzle temperature a little, dry the filament, tune retraction.
Rough joints	Lightly sand the dovetails; do not force them.
Layer lines show through paint	Use 0.16 mm layers or sand and prime before painting.

Questions people ask

Can I use a 0.6 mm nozzle?

The 1.6 mm wall is a multiple of 0.4 mm lines, so a 0.4 mm nozzle gives the cleanest result. With a larger nozzle you can still print the channel, but check that the wall width in your slicer is not thicker than 1.6 mm.

Do I need to print slowly?

No. Moderate speeds work. Slow down the first layer and the outer walls if your printer shows ringing on long straight runs.

Should I use a brim?

Only if pieces lift. A brim on narrow channels can be hard to remove, so try a clean bed and the right first-layer height first.

Written and checked by the Volucore team against the behaviour of our tools. Spotted a mistake or something out of date? Tell us and we will fix it.