Prusa Mini+ with E3D Revo Micro & ObXidian Nozzles

Specialized knowledge for printing on a modified Prusa Mini+ with E3D Revo Micro hotend and ObXidian wear-resistant nozzles in 0.25mm, 0.4mm, 0.6mm, and 0.8mm sizes.

Hardware Specifications

Component	Specification
Printer	Prusa Mini+
Build Volume	180 × 180 × 180 mm
Hotend	E3D Revo Micro (40W HeaterCore)
Thermistor	Semitec 104NT-4-R025H42G
Nozzles	ObXidian 0.25mm, 0.4mm, 0.6mm, 0.8mm
Max Hotend Temp	300°C
Filament Diameter	1.75mm
Drive System	Bowden with direct drive extruder

Nozzle Selection Guide

Nozzle	Best For	Trade-offs
0.25mm	Fine detail, text, miniatures	Slowest, avoid abrasive filaments
0.4mm	General purpose, balanced	Standard, most profiles available
0.6mm	Faster prints, structural parts	Less detail, +25% impact strength
0.8mm	Rapid prototyping, large objects	Least detail, fastest, best for abrasives

When to Use Each Nozzle

0.25mm - Miniatures, small text, jewelry, precision parts

• ⚠️ Avoid filled filaments (particles often >0.25mm)
• ASA and ABS work best with small nozzles per E3D

0.4mm - Default for most prints, prototypes, mixed detail

0.6mm - Structural parts, functional prints, moderate abrasives

0.8mm - Large objects, vases, rapid prototypes, heavy abrasives (CF, GF)

• Best choice for filled filaments—lowest clog risk
• May need 60W HeaterCore for high-temp materials at high flow

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E3D Official Starter Settings

These are E3D's conservative starter settings for Revo hotends. Track width = extrusion width ≈ nozzle diameter.

PLA - 200°C

Nozzle	Profile	Layer Height	Wall Speed	Infill Speed
0.25mm	Fine	0.06mm	15 mm/s	30 mm/s
0.25mm	Medium	0.125mm	25 mm/s	50 mm/s
0.25mm	Coarse	0.18mm	30 mm/s	60 mm/s
0.40mm	Fine	0.10mm	15 mm/s	30 mm/s
0.40mm	Medium	0.20mm	25 mm/s	50 mm/s
0.40mm	Coarse	0.30mm	30 mm/s	60 mm/s
0.60mm	Fine	0.15mm	15 mm/s	30 mm/s
0.60mm	Medium	0.30mm	25 mm/s	50 mm/s
0.60mm	Coarse	0.45mm	30 mm/s	60 mm/s
0.80mm	Fine	0.20mm	15 mm/s	30 mm/s
0.80mm	Medium	0.40mm	25 mm/s	50 mm/s
0.80mm	Coarse	0.60mm	30 mm/s	60 mm/s

Bed: 50-60°C | Cooling: 100%

PETG - 240°C

Nozzle	Profile	Layer Height	Wall Speed	Infill Speed
0.25mm	Fine	0.06mm	15 mm/s	30 mm/s
0.25mm	Medium	0.125mm	25 mm/s	50 mm/s
0.25mm	Coarse	0.18mm	30 mm/s	60 mm/s
0.40mm	Fine	0.10mm	15 mm/s	30 mm/s
0.40mm	Medium	0.20mm	25 mm/s	50 mm/s
0.40mm	Coarse	0.30mm	30 mm/s	60 mm/s
0.60mm	Fine	0.15mm	15 mm/s	30 mm/s
0.60mm	Medium	0.30mm	25 mm/s	50 mm/s
0.60mm	Coarse	0.45mm	30 mm/s	60 mm/s
0.80mm	Fine	0.20mm	15 mm/s	30 mm/s
0.80mm	Medium	0.40mm	25 mm/s	50 mm/s
0.80mm	Coarse	0.60mm	30 mm/s	60 mm/s

Bed: 70-85°C | Cooling: 30-50%

ASA - 240°C

Nozzle	Profile	Layer Height	Wall Speed	Infill Speed
0.25mm	Fine	0.06mm	15 mm/s	30 mm/s
0.25mm	Medium	0.125mm	25 mm/s	50 mm/s
0.25mm	Coarse	0.18mm	30 mm/s	60 mm/s
0.40mm	Fine	0.10mm	15 mm/s	30 mm/s
0.40mm	Medium	0.20mm	25 mm/s	50 mm/s
0.40mm	Coarse	0.30mm	30 mm/s	60 mm/s
0.60mm	Fine	0.15mm	15 mm/s	30 mm/s
0.60mm	Medium	0.30mm	25 mm/s	50 mm/s
0.60mm	Coarse	0.45mm	30 mm/s	60 mm/s
0.80mm	Fine	0.20mm	15 mm/s	30 mm/s
0.80mm	Medium	0.40mm	25 mm/s	50 mm/s
0.80mm	Coarse	0.60mm	30 mm/s	60 mm/s

Bed: 90-100°C | Cooling: 10-30% | Enclosure recommended

ABS - 245°C (Similar to ASA)

Use ASA settings. ABS typically prints 5°C hotter than ASA.

Bed: 95-110°C | Cooling: 0-20% | Enclosure required

TPU 92A - 230°C

Nozzle	Profile	Layer Height	Wall Speed	Infill Speed
0.25mm	Fine	0.06mm	15 mm/s	30 mm/s
0.25mm	Medium	0.125mm	25 mm/s	50 mm/s
0.25mm	Coarse	0.18mm	30 mm/s	60 mm/s
0.40mm	Fine	0.10mm	15 mm/s	30 mm/s
0.40mm	Medium	0.20mm	30 mm/s	60 mm/s
0.40mm	Coarse	0.30mm	40 mm/s	80 mm/s
0.60mm	Fine	0.15mm	15 mm/s	30 mm/s
0.60mm	Medium	0.30mm	25 mm/s	50 mm/s
0.60mm	Coarse	0.45mm	30 mm/s	60 mm/s
0.80mm	Fine	0.20mm	15 mm/s	30 mm/s
0.80mm	Medium	0.40mm	25 mm/s	50 mm/s
0.80mm	Coarse	0.60mm	30 mm/s	60 mm/s

Bed: 40-60°C | Cooling: 50% | Retraction: Minimal or disabled

TPU 85A / 75A - 260°C

Softer TPUs require higher temps. Same layer heights as TPU 92A.

Bed: 40-60°C | Cooling: 50% | ⚠️ Bowden systems struggle with soft TPU

PETG Carbon Fiber (XT-CF) - 250°C

⚠️ Use 0.4mm nozzle or larger only

Nozzle	Profile	Layer Height	Wall Speed	Infill Speed
0.40mm	Fine	0.10mm	15 mm/s	30 mm/s
0.40mm	Medium	0.20mm	25 mm/s	50 mm/s
0.40mm	Coarse	0.30mm	30 mm/s	60 mm/s
0.60mm	Fine	0.15mm	15 mm/s	30 mm/s
0.60mm	Medium	0.30mm	25 mm/s	50 mm/s
0.60mm	Coarse	0.45mm	30 mm/s	60 mm/s
0.80mm	Fine	0.20mm	15 mm/s	30 mm/s
0.80mm	Medium	0.40mm	25 mm/s	50 mm/s
0.80mm	Coarse	0.60mm	30 mm/s	60 mm/s

Bed: 75-90°C | Cooling: 30-50%

Nylon Carbon Fiber - 270°C

⚠️ Use 0.4mm nozzle or larger only | Dry filament thoroughly

Nozzle	Profile	Layer Height	Wall Speed	Infill Speed
0.40mm	Fine	0.10mm	15 mm/s	30 mm/s
0.40mm	Medium	0.20mm	30 mm/s	60 mm/s
0.40mm	Coarse	0.30mm	40 mm/s	80 mm/s
0.60mm	Fine	0.15mm	15 mm/s	30 mm/s
0.60mm	Medium	0.30mm	30 mm/s	60 mm/s
0.60mm	Coarse	0.45mm	40 mm/s	80 mm/s
0.80mm	Fine	0.20mm	15 mm/s	30 mm/s
0.80mm	Medium	0.40mm	30 mm/s	60 mm/s
0.80mm	Coarse	0.60mm	40 mm/s	80 mm/s

Bed: 70-90°C | Cooling: 20-40% | Enclosure recommended

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Quick Reference: Temperature Summary

Material	Hotend	Bed	Cooling	Notes
PLA	200°C	50-60°C	100%	Easy, universal
PETG	240°C	70-85°C	30-50%	Strings easily
ASA	240°C	90-100°C	10-30%	UV resistant
ABS	245°C	95-110°C	0-20%	Enclosure required
TPU 92A	230°C	40-60°C	50%	Flexible
TPU 85A/75A	260°C	40-60°C	50%	Very flexible
PETG-CF	250°C	75-90°C	30-50%	0.4mm+ only
Nylon-CF	270°C	70-90°C	20-40%	0.4mm+ only, dry!

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Layer Height Ranges

Formula: Min = 25% nozzle, Max = 75-80% nozzle

Nozzle	Minimum	Maximum	E3D Fine	E3D Medium	E3D Coarse
0.25mm	0.06mm	0.20mm	0.06mm	0.125mm	0.18mm
0.40mm	0.10mm	0.32mm	0.10mm	0.20mm	0.30mm
0.60mm	0.15mm	0.48mm	0.15mm	0.30mm	0.45mm
0.80mm	0.20mm	0.64mm	0.20mm	0.40mm	0.60mm

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Volumetric Flow Limits (40W HeaterCore)

Nozzle	PLA	PETG	ABS/ASA	Notes
0.25mm	4-5	3-4	4-5	Limited by geometry
0.40mm	8-11	6-8	8-10	Standard
0.60mm	11-15	8-11	10-12	Higher throughput
0.80mm	15-17	10-13	12-15	May benefit from 60W

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Retraction Settings (Bowden)

Nozzle	Length	Speed	PETG Add
0.25mm	3.0mm	35 mm/s	+0.5mm
0.40mm	3.5mm	35 mm/s	+0.5mm
0.60mm	4.0mm	35 mm/s	+0.5-1.0mm
0.80mm	4.5mm	35 mm/s	+0.5-1.0mm

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PrusaSlicer Configuration

Printer Settings (per nozzle)

Setting	0.25mm	0.40mm	0.60mm	0.80mm
Nozzle diameter	0.25	0.4	0.6	0.8
Min layer height	0.06	0.10	0.15	0.20
Max layer height	0.20	0.32	0.48	0.64
Retraction length	3.0mm	3.5mm	4.0mm	4.5mm
Retraction speed	35 mm/s	35 mm/s	35 mm/s	35 mm/s
Lift Z	0.15mm	0.2mm	0.2mm	0.3mm

Built-in Profiles

PrusaSlicer has profiles for multiple nozzle sizes:

1. Configuration → Configuration Wizard
2. Select "Original Prusa MINI+"
3. Check boxes for each nozzle size (0.25, 0.4, 0.6)
4. 0.8mm: Create manually based on 0.6mm profile

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Nozzle Swap Procedure

Revo quick-swap (no tools, no hot-tightening):

1. Cool down below 50°C
2. Unscrew current nozzle by hand
3. Install new nozzle, finger-tight only
4. Update slicer - select correct nozzle profile
5. Re-calibrate - run First Layer Calibration
6. Verify - print test square

⚠️ Each nozzle needs its own Live Z calibration!

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Speed Calculation

Max Speed (mm/s) = Max Flow (mm³/s) / (Layer Height × Line Width)

Examples at E3D Medium profile:

Nozzle	Layer	Width	E3D Wall	E3D Infill
0.25mm	0.125mm	0.25mm	25 mm/s	50 mm/s
0.40mm	0.20mm	0.40mm	25 mm/s	50 mm/s
0.60mm	0.30mm	0.60mm	25 mm/s	50 mm/s
0.80mm	0.40mm	0.80mm	25 mm/s	50 mm/s

Note: E3D settings are conservative. Prusa Mini+ can often handle faster speeds.

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ObXidian Nozzle Care

All sizes:

• E3DLC coating: Non-stick, reduces buildup
• Copper alloy body: Brass-equivalent thermal performance
• Tool steel tip: Wear-resistant
• Max temp: 300°C
• Install: Finger-tight only, no tools

Size-specific guidance:

Nozzle	Abrasive Filaments	Clog Risk
0.25mm	❌ Avoid	High
0.40mm	⚠️ Light use	Medium
0.60mm	✅ Good	Low
0.80mm	✅ Best choice	Very Low

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Detailed References

• For material-specific profiles: See references/material-profiles.md
• For common print issues: See references/troubleshooting.md