All articles
Every Rongcai article in one place: technical guides on the extrusion process, buying guides for selecting a filament line, and reports from the trade shows we attend.
Technical guides
Two settings decide how a spool leaves the line: the tension the filament is wound under, and how the filament end is fixed. This guide compares tape fixing with threading hole fixing and lists the spool details a winding machine is specified around.
The strand is still soft when it leaves the die, so the cooling section is what settles its final shape. This guide covers the reason for a warm bath ahead of the cold bath, the three settings that decide the outcome, and where to look first when ovality or start-of-run drift appears.
Diameter is held by a loop rather than by the extruder: the gauge measures, the controller compares, and the traction drive corrects. This guide explains what each part contributes to tolerance and which two questions to ask about any figure on a datasheet.
Buying guides
A filament extrusion line is specified from the requirement side. This guide works through the six answers that decide a configuration, the difference between extrusion output and finished spools, and the questions worth asking any supplier before ordering.
A quotation can only be as specific as the request behind it. This guide lists the nine items that remove supplier assumptions, explains which ones move the configuration most, and shows what spool photographs and site details are worth sending.
Trade shows
Rongcai Machinery exhibited at TCT in Shanghai from 17 to 19 March 2026, running a 3D printing filament extrusion and automatic winding line on the booth for visitors from the filament industry. This report covers what was shown and the three questions that came up most often.
Share the material, filament diameter, target output and spool specification. Rongcai reviews the configuration and prepares a quotation.
