What temperature should I print ASA on the Prusa MK3S+?

Start at 250°C for the hotend and 100°C for the bed, then run a temperature tower across 240–265°C to dial in your exact filament brand.

What print speed works for ASA on this printer?

Around 70 mm/s is a safe starting point on the Prusa MK3S+. It can go faster once the profile is tuned, but start conservative for clean walls.

What retraction should I use?

Use about 0.8 mm of retraction (direct drive needs very little). If you see stringing, raise retraction speed before distance and dry the filament.

Do I need an enclosure for ASA on the Prusa MK3S+?

Yes — ASA needs an enclosure to avoid warping, and the Prusa MK3S+ is open, so add one or expect warping and cracking on larger parts.

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ASA settings for the Prusa MK3S+

Workable with mods

⚡ Quick answer: Print ASA on the Prusa MK3S+ at 250°C hotend, 100°C bed, 70 mm/s, 10% part-cooling fan and 0.8 mm retraction. Run a temperature tower to fine-tune your exact spool.

These are tuned starting settings for printing ASA on the Prusa MK3S+. The Prusa MK3S+ has a direct-drive extruder with an all-metal hotend, so we set the hotend to 250°C and the bed to 100°C. ASA is the UV-stable cousin of ABS, built for parts that live outdoors in sun and weather without yellowing.

250°C

Hotend

100°C

Bed

70 mm/s

Speed

10%

Part fan

⚠️ Like ABS, ASA warps and fumes — an enclosure and ventilation are required. A touch more fan than ABS keeps overhangs crisp. The open Prusa MK3S+ works for small parts, but expect warping on anything large.

Recommended ASA profile

Hotend temperature	250°C (tower 240–265°C)
Bed temperature	100°C
Print speed	70 mm/s
Retraction	0.8 mm (direct drive)
Part cooling fan	10%
Bed adhesion	ABS/ASA slurry or glue on the heated bed.
Nozzle	Brass 0.4 mm
Difficulty	Advanced

💡 Best uses for ASA: outdoor and UV-exposed parts.

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Troubleshooting ASA on the Prusa MK3S+

Problem	Fix
Stringing or fine hairs	Dry ASA before printing, drop the hotend a few degrees below 250°C, and raise retraction toward 1.2 mm. Damp filament is the No. 1 cause of stringing.
Poor first-layer adhesion	ABS/ASA slurry or glue on the heated bed. Re-level the bed, set a slightly squished first layer, and wipe the sheet with IPA so it is grease-free.
Blobs, zits or rough walls	Slow the outer wall, enable coasting/wipe, and keep retraction near 0.8 mm. Keep the part-cooling fan low so layers bond and warping stays down.

FAQ

What temperature should I print ASA on the Prusa MK3S+?: Start at 250°C for the hotend and 100°C for the bed, then run a temperature tower across 240–265°C to dial in your exact filament brand.
What print speed works for ASA on this printer?: Around 70 mm/s is a safe starting point on the Prusa MK3S+. It can go faster once the profile is tuned, but start conservative for clean walls.
What retraction should I use?: Use about 0.8 mm of retraction (direct drive needs very little). If you see stringing, raise retraction speed before distance and dry the filament.
Do I need an enclosure for ASA on the Prusa MK3S+?: Yes — ASA needs an enclosure to avoid warping, and the Prusa MK3S+ is open, so add one or expect warping and cracking on larger parts.

Sources & how we tuned this

These settings are community-tested starting points, cross-checked against manufacturer guidance and trusted material references:

Last verified: 2026-07-17. Always run a temperature tower and a small calibration print for your exact spool.