How do I remove parts from a model sprue?
Cutting and Trimming
Hold the sprue and the part steady. Place the cutters flat against the sprue, not the part, and squeeze. Cut one gate at a time; if a part has multiple gates, support it so it doesn't fall and break. Leave a tiny bit of plastic attached to avoid gouging the part.
After cutting, use a hobby knife to shave the remaining nub. Angle the blade and slice away from you. For clear parts, use a new blade and light pressure to avoid cracks. Then sand with a fine sanding stick or file to smooth the area.
- Use sprue cutters, not scissors or nail clippers
- Cut gates one at a time
- Leave a small stub, then trim
- Sand with fine grit (600–1000)
- For clear parts, use a fresh blade and gentle pressure
Avoiding Damage
Twisting or pulling a part off the sprue can stress the plastic, causing white marks or breaks. Always cut. If a part is fragile, support it with your finger or a piece of foam. For very small parts, cut them over a tray so they don't get lost.
Some kits have tight gates; if the cutter doesn't fit, use a hobby knife to score the gate, then snap gently. Always work in a well-lit area and keep your fingers clear of the blade.
Common mistakes
- Twisting parts off the sprue, which can break or stress the plastic.
- Cutting too close to the part, risking damage.
- Using dull cutters that crush rather than cut.