Form 4L Resin Flow Restriction Due to Swollen Bite Valve

The most likely cause for slow dispensing is the physical degradation of the cartridge's rubber bite valve, which restricts the flow of resin. This is confirmed by removing the resin cartridge and manually squeezing the bite valve on the underside. If the valve feels stiff, fails to open fully, or shows visible signs of swelling or deformation compared to a new, functional cartridge, it confirms the valve is obstructing the resin flow.