Circuitrocks

Designed wrist-mounted ESP32 case, TPU 95A filament. Print fails 3 ways before getting clean parts.

Bad runs:

• Filament jam at extruder (too soft for stock Bowden tube guide)
• Stringing across overhangs (retraction defaults wrong for TPU)
• Layer separation at bend zones (cooling fan too aggressive)

Settings that finally worked:

• Print speed 25mm/s (slow, deliberate)
• Retraction 1mm at 25mm/s (vs 6mm 45mm/s for PLA)
• Cooling fan 30% (vs 100% PLA)
• Nozzle 230C, bed 50C
• Direct drive extruder strongly recommended (Bambu A1 Mini OK with patience)

Result: flexible case that survives 6+ months of wrist movement. PHP 280 per print.

Other TPU users here? Tips for thinner walls (mine settled at 2.5mm minimum)?