Gunpla Scribing for Beginners: Tape First, Then a $28 Chisel

For Gunpla scribing, Tamiya's instruction on its 0.15 mm blade says it best: pull it toward you, "no need to push down". The real decision is whether you deepen the lines a kit already has or cut new ones, because new lines need guide tape before any blade.

Key Takeaways

• Two jobs: deepen molded lines, or scribe new ones with tape as a straightedge.
• Light pulls: Tamiya, GSI Creos and Sujiborido all describe light, repeated strokes.
• Uniform width: the Mr. Line Chisel's convex tip keeps grooves even and burr-free, GSI Creos says.
• Fragile tips: BMC Tagane can break under twisting or bending.
• US prices, Oct 24: $15.00 to $28.00 for a first tool.

Overview: Gunpla scribing tools and what each is for

Scribing means cutting a groove into the plastic, either to make a molded panel line deeper or to add a new one.

Diagram: PlamoDesk. Sources: Tamiya, GSI Creos and Sujiborido product pages (Japanese pages our translation); Gundam Planet and USA Gundam Store listings, Oct 24.

• Mr. Line Chisel (GT65). GSI Creos calls it a precision tool dedicated to scribing. Its convex tip gives a uniform groove width and clean edges without burrs, and it comes with a 0.3 mm blade (our translation).
• BMC Tagane. Sujiborido's chisel blades, 0.15 mm at 2,970 yen with tax on the maker's shop.
• Tamiya fine engraving blades. Sold one per pack (0.1, 0.15 and 0.2 mm among them) for the aluminum 74139 holder, which also takes Design Knife blades.
• Tamiya Fine Engraving Needle 20° (74148). A tungsten carbide needle that "can be used as one would a scriber."

Desk note: The Mr. Line Chisel was $28.00 at Gundam Planet on Oct 24, against 2,860 yen with tax in Japan. The cheapest scriber in either shop's results was a $15.00 MADWORKS DLC 0.5 mm, and neither shop's search returned a Tamiya engraving blade that day.

Step-by-Step: Gunpla scribing on a first kit

1. Decide: deepen or add. Deepening follows a line Bandai already molded. Adding a line needs a plan and tape.

2. Lay guide tape for new lines. A Volks shop blog puts it simply: until you are used to it, freehand scribing drifts or slips (our translation). Tamiya's stainless templates are 0.1 mm thick and bend over curved surfaces.

3. Pull lightly toward you. Tamiya's 0.15 mm blade page: "Pull the blade lightly towards yourself for optimal results - no need to push down!" GSI Creos says the same for its chisel: a few light passes toward you deepen a line easily.

4. Repeat instead of pressing. Sujiborido says to use the BMC Tagane without force, scribing lightly many times (our translation).

5. Keep the blade straight. The BMC Tagane tip "has no toughness", its maker warns, and can break under twisting or bending force (our translation).

6. Clean and line it. Brush away the shavings, then panel line the new groove.

Diagram: PlamoDesk. Sources: Tamiya 74145 and 74154, GSI Creos GT65, Sujiborido BMC Tagane pages; Volks shop blog for the tape step.

GODEEPER: The ink step after the blade. How to panel line Gunpla →

Tips: Gunpla scribing without ruined parts

• Practice on the runner. Scrap plastic shows how much pressure is too much.
• Start mid-size. The chisel ships with 0.3 mm; Tamiya calls 0.15 mm right for models such as 1/24 cars. The Volks blog suggests starting at 0.15.
• Templates for shapes. Tamiya designs its 74154 template for the 74148 needle; the square 74156 is "Designed for advanced modelers."
• Keep it away from kids. Sujiborido says never to keep the BMC Tagane near children.
• Check stock before a project. Two of the four BMC Tagane sizes at USA Gundam Store were out of stock on Oct 24.

Metalworking scribers, not hobby blades: the same idea at a larger scale. Photo: Glenn McKechnie / Wikimedia Commons, CC BY-SA 3.0.

GODEEPER: Deeper lines suit a painted kit. Hand painting Gunpla →

What builders say

Two replies on a first-time scribing post on r/Gunpla, read through Arctic Shift:

"hard side scribing tape is super important for keeping crisp lines. It's a good first try." u/Sianmink on r/Gunpla, October 2026

"Near perfect symmetry is tough and requires a lot of careful planning/placement of scribe tape." u/Jackedanese on r/Gunpla, October 2026

Both point at the tape, not the blade.

What we don't know yet: We found no GSI Creos scribing guide tape and no Tamiya engraving blade in either US shop's search on Oct 24. Check the shops again before you order a full set.

Our take

Start by deepening molded lines with the $28 Mr. Line Chisel; buy guide tape before scribing any new line. GSI Creos says light passes toward you deepen a line easily, and its tip keeps the width uniform. New lines are where beginners slip, which is why both r/Gunpla replies talk about tape. Add a $18.99 to $19.99 BMC Tagane once you plan new detail. We recheck prices with the next tools update.

How we checked this

On Oct 24, 2026 we read Tamiya's pages for 74135, 74136, 74139, 74145, 74148, 74154 and 74156, GSI Creos's Mr. Line Chisel page, Sujiborido's BMC Tagane 0.15 mm page, GodHand's Riegel Needle page, a Volks shop blog, and US listings at Gundam Planet and USA Gundam Store. A research assistant gathered the pages; we re-read the Mr. Line Chisel page. Bandai's site was in maintenance. We did not test these tools.

Frequently Asked Questions

What tools do I need to scribe Gunpla? A scribing blade or needle and guide tape. GSI Creos's Mr. Line Chisel (2,860 yen with tax; $28.00 at Gundam Planet on Oct 24) deepens existing lines. Sujiborido's BMC Tagane and Tamiya's fine engraving blades cut new ones; tape keeps the line straight.

How do you scribe panel lines without slipping? Use guide tape and light passes. Tamiya says to pull its engraving blade lightly toward you with no need to push down, and Sujiborido says to scribe lightly many times without force. A r/Gunpla reply calls hard-sided scribing tape super important for crisp lines.

What size scribing blade should a beginner start with? Around 0.15 to 0.3 mm. The Mr. Line Chisel comes with a 0.3 mm blade, and Tamiya says its 0.15 mm blade suits models such as 1/24 cars. A Volks shop blog suggests starting at 0.15 and adding thicker and thinner sizes later.

Can scribing blades break? Yes. Sujiborido warns that the BMC Tagane tip has no toughness and can break under twisting or bending force, and says to keep it away from children. Scribe straight along the line and never lever the blade sideways.

Is the Mr. Line Chisel good for beginners? For deepening existing lines, yes. GSI Creos says light passes toward you along a molded line deepen it easily, and its convex tip keeps the groove width uniform without burrs. It comes with a 0.3 mm blade; replacement blades plug in.

How much do scribing tools cost in the US? From about $15 to $28 on Oct 24. Gundam Planet had a MADWORKS DLC 0.5 mm scriber at $15.00 and the Mr. Line Chisel at $28.00; USA Gundam Store had BMC Tagane blades at $18.99 to $19.99, two sizes out of stock.

Related Reading

• Gundam Marker Types: which pen to run along a fresh groove.
• Gunpla Tools Guide: every tool from the first nipper to the finish.
• Gunpla Seam Line Removal: another sand-and-fix job.
• HG vs RG vs MG: the same RX-78-2 in three grades.
• Gunpla masking tape: Tamiya and GSI Creos tapes from 1mm to 18mm wide.

References

• Tamiya: Fine Engraving Needle 20° 74148, Engraving Blade Holder 74139, Fine Engraving Blade 0.1 mm 74135, 0.15 mm 74145, 0.2 mm 74136, Modeling Template 74154, 74156
• GSI Creos Mr. Hobby (Japanese): Mr. Line Chisel GT65
• Sujiborido (Japanese): BMC Tagane 0.15 mm
• Gundam Planet: Mr. Line Chisel, MADWORKS DLC Scriber 0.5 mm
• USA Gundam Store: BMC Tagane 0.1 mm
• Volks Akihabara Hobby Square blog: scribing guide tape (Japanese)