What temperature should I print TPU 85A on the Prusa MK4S?

Start at 230°C for the hotend and 45°C for the bed, then run a temperature tower across 215–240°C to dial in your exact filament brand.

What print speed works for TPU 85A on this printer?

Around 43 mm/s is a safe starting point on the Prusa MK4S. It can go faster once the profile is tuned, but start conservative for clean walls.

What retraction should I use?

Use about 0.4 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 TPU 85A on the Prusa MK4S?

No, TPU 85A prints fine in the open on the Prusa MK4S.

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TPU 85A settings for the Prusa MK4S

Great match

⚡ Quick answer: Print TPU 85A on the Prusa MK4S at 230°C hotend, 45°C bed, 43 mm/s, 30% part-cooling fan and 0.4 mm retraction. Run a temperature tower to fine-tune your exact spool.

These are tuned starting settings for printing TPU 85A on the Prusa MK4S. The Prusa MK4S has a direct-drive extruder with an all-metal hotend, so we set the hotend to 230°C and the bed to 45°C. TPU 85A is a softer, stretchier grade that only prints well on direct-drive extruders.

230°C

Hotend

45°C

Bed

43 mm/s

Speed

30%

Part fan

Recommended TPU 85A profile

Hotend temperature	230°C (tower 215–240°C)
Bed temperature	45°C
Print speed	43 mm/s
Retraction	0.4 mm (direct drive)
Part cooling fan	30%
Bed adhesion	Clean bed; glue usually not needed.
Nozzle	Brass 0.4 mm
Difficulty	Advanced

💡 Best uses for TPU 85A: very soft, stretchy flexible parts.

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Troubleshooting TPU 85A on the Prusa MK4S

Problem	Fix
Stringing or fine hairs	Dry TPU 85A before printing, drop the hotend a few degrees below 230°C, and raise retraction toward 0.8 mm. Damp filament is the No. 1 cause of stringing.
Poor first-layer adhesion	Clean bed; glue usually not needed. 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 0.4 mm. Keep the part-cooling fan low so layers bond and warping stays down.

FAQ

What temperature should I print TPU 85A on the Prusa MK4S?: Start at 230°C for the hotend and 45°C for the bed, then run a temperature tower across 215–240°C to dial in your exact filament brand.
What print speed works for TPU 85A on this printer?: Around 43 mm/s is a safe starting point on the Prusa MK4S. It can go faster once the profile is tuned, but start conservative for clean walls.
What retraction should I use?: Use about 0.4 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 TPU 85A on the Prusa MK4S?: No, TPU 85A prints fine in the open on the Prusa MK4S.

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.