Tagged “part-cooling”

Answer·Materials·October 24, 2026

Should you use a cooling fan for ABS?

Mostly no. Run ABS with the part fan off or low: PrusaSlicer's Generic ABS keeps it off, Bambu ABS runs 10%, and both raise it for bridges and fast layers.

Read the answerOpen

Answer·Troubleshooting·October 24, 2026

Why do overhangs droop in 3D printing?

Each overhang layer rests partly on air; past about 45° from vertical, soft plastic sags before it cools. Fix: full fan, slower overhangs, a cooler nozzle.

Read the answerOpen

Answer·Materials·October 24, 2026

How much cooling does PETG need?

A moderate fan, about 20 to 60%, not PLA's 100%. Prusa's PETG profile runs 30 to 50%, Bambu's 20 to 40%; both keep it off for 3 layers, more for bridges.

Read the answerOpen

Answer·Materials·October 24, 2026

What fan speed should you use for PLA?

Run PLA's part cooling fan at 100%, off on the first layer for bed adhesion. Prusament's data sheet says 100%; some printer profiles start at 50 to 85% and ramp up.

Read the answerOpen

Answer·Hardware·October 24, 2026

Can you 3D print without a cooling fan?

Yes for ABS, ASA, PC and nylon: profiles run the part fan off or at 10 to 20% on long layers. PLA needs it for bridges and overhangs. Never turn off the hotend fan.

Read the answerOpen

Answer·Troubleshooting·October 24, 2026

Why are my small prints melting and blobby?

Small layers print in seconds, so the next lands before the last one cools. Set a minimum layer time (4 to 12 s in stock PLA profiles) and keep the fan at max.

Read the answerOpen

Answer·Hardware·October 24, 2026

What does the part cooling fan do?

It cools plastic leaving the nozzle so it sets before the next line lands, making bridges, overhangs and fine tips work. Base PLA profiles run it at 100% after layer 1.

Read the answerOpen