That is pretty normal for first fill. On consecutive prints it shouldn’t take that long.
Couple things to check:
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Did you shake the cartridge before first use? Our resins don’t settle much, but this will speed up dispense.
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Is your room cold, or did you store resin in a cold room? Colder resin is more viscous and flows slower.
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Is the venting cap open?
Dispense mechanism is designed to dispense small amounts; first fill requires 150ml or so, so it takes bit longer.
I hope this helps.