🔧 3D Print Post-Processing & Cleanup
From bed to beautiful — a comprehensive guide to finishing your prints, featuring the Fanttik F2 Master rotary tool
1. The Cleanup Workflow
Every 3D print goes through the same progression from rough to refined. Here's the full pipeline:
🛏️ Remove
from bed
→
✂️ Remove
supports
→
🔪 Trim
brims/rafts
→
🔧 Rotary tool
rough cleanup
→
📐 Hand
sanding
→
✨ Polishing
& finishing
💡
Not every print needs every step. A functional bracket? Just remove supports and you're done. A display piece or gift? Go through the full pipeline. Match the effort to the purpose.
The Starter Kit
| Tool | What It's For | Priority |
|---|
| Flush cutters | Snipping supports, brim tabs, stringing | Essential |
| Needle-nose pliers | Gripping and tearing away support structures | Essential |
| X-Acto / craft knife | Trimming nubs, cleaning edges, scraping seams | Essential |
| Sandpaper set (120-2000 grit) | Progressive smoothing of layer lines | Essential |
| Rotary tool (Fanttik F2 Master) | Fast sanding, grinding, polishing, detail work | Highly Recommended |
| Needle files (set of 6-10) | Tight spaces, slots, holes, detailed areas | Recommended |
| Tweezers | Removing tiny strings, support fragments | Nice to have |
| Heat gun (low setting) | Removing stringing, light deformation fix | Optional |
3. Fanttik F2 Master — Deep Dive
The Fanttik F2 Master is a compact, cordless rotary tool designed for precision work — and it's particularly well-suited for 3D print post-processing. Think of it as a miniature Dremel that fits like a pen.
Specifications
| Spec | Value |
|---|
| Motor | Brushless hollow cup motor |
| Speed Range | 12,000 – 25,000 RPM (5 levels) |
| Speed Levels | 12K / 15K / 18K / 20K / 25K RPM |
| Noise Level | ~32 dB (30% quieter than standard) |
| Collet Size | 3/32" (2.3mm) — NOT 1/8" |
| Weight | 0.22 lb (100g) |
| Battery | 4.0V / 700mAh / 2.8Wh |
| Runtime | ~60-120 min continuous |
| Charging | USB-C, ~60 min full charge |
| Accessories Included | 35 pieces (all 3/32" shank) |
| Storage | RevoStor 360° magnetic hub |
| Extras | LED work light, speed indicator, shaft lock |
| Price | ~$80 (often $65 with coupon) |
⚠️
Collet compatibility: The F2 Master uses 3/32" (2.3mm) shanks — NOT the more common 1/8" (3.2mm) used by Dremel. Make sure replacement bits match this size. The included 35-piece set covers most needs.
Speed Settings — When to Use Each
1: 12K
2: 15K
3: 18K
4: 20K
5: 25K
| Speed | RPM | Best For | 3D Print Use |
|---|
| Level 1 | 12,000 | Delicate polishing, soft materials | Final polish on PLA, buffing with felt/leather |
| Level 2 | 15,000 | Light sanding, detail work | Sanding thin walls, delicate features, small parts |
| Level 3 | 18,000 | General sanding, grinding | ⭐ Sweet spot for most 3D print cleanup |
| Level 4 | 20,000 | Aggressive material removal | Removing thick supports, heavy layer lines |
| Level 5 | 25,000 | Hard materials, cutting | PETG/ABS cleanup, drilling, hard-to-reach grinding |
🔥
Heat warning for PLA: PLA softens at ~60°C. High RPM + too much pressure = friction heat = melted plastic. For PLA, stay at Level 2-3 (15-18K RPM) and use light, intermittent passes. Let the tool do the work — don't push hard. If you see the plastic start to get shiny/gummy, you're going too fast.
Why It's Great for 3D Prints
- Pen grip — Holds like a marker, giving you precise control that a bulky Dremel can't match
- Lightweight (100g) — No hand fatigue even on long sessions
- Quiet (32 dB) — You can use it at your desk without ear protection
- Cordless — No cord catching on your print; move freely around the piece
- LED light — Illuminates the work area, crucial for seeing fine detail
- Variable speed — Critical for plastics which melt at high RPM
4. F2 Master Accessories — Complete Guide
The F2 Master comes with 35 accessories in its RevoStor magnetic hub. Here's every type, what it does, and exactly when to use it for 3D print cleanup:
💎 Diamond Wheel Points
13 included — Various shapes (cylinder, ball, cone, flame, needle)
Diamond-coated grinding bits for precise material removal. The hardest and most aggressive bits in the kit. Each shape reaches different geometries.
🖨️ Grinding down support contact points
🖨️ Reaching into tight corners and channels
🖨️ Smoothing seam lines on curved surfaces
Recommended: 15-25K RPM on metals/hard plastics • 12-18K on PLA
Shape Guide:
| Cylinder | Flat surface grinding, removing brim remnants |
| Ball/Sphere | Concave surfaces, sockets, rounded areas |
| Cone/Tapered | V-grooves, inside corners, tight angles |
| Flame | Accessing narrow slots, undercuts |
| Needle/Point | Tiny details, engraving, hole cleanup |
🔩 Carving Bits (Burrs)
3 included — Various profiles
Steel cutting/carving bits with fluted edges. Designed for shaping, hollowing, grooving, slotting, and making tapered holes. More aggressive than diamond points — they cut rather than grind.
🖨️ Removing large support structures quickly
🖨️ Shaping and modifying printed parts
🖨️ Cleaning up hole interiors
Soft wood: 18-25K • Plastics: 12-18K • Metals: 12-18K
🟤 Rubber Polishing Points
2 included
Steel-impregnated rubber bits with embedded abrasive. Removes rough areas, small burrs, and scratch marks. Gentler than diamond points — good for intermediate smoothing after rough grinding.
🖨️ Smoothing after support removal (medium finish)
🖨️ Removing small burrs and nubs
🖨️ Blending layer lines on curved surfaces
All materials: 15-25K RPM
🟡 Sesame Polishing Points
2 included
Aluminum oxide grinding stones — the classic rotary tool abrasive. Named for their grainy texture. Used for sharpening, deburring, and general-purpose grinding on most materials including stainless steel.
🖨️ Heavy layer line removal on thick parts
🖨️ Deburring support contact areas
🖨️ Reshaping/modifying print geometry
Wood: 18-25K • Plastics: 12-18K • Metals: 12-25K
🟫 Cowhide (Leather) Polishing Wheels
2 included
Leather buffing wheels for final polishing. Creates a smooth, slightly glossy finish. Apply polishing compound for best results. The gentlest accessory — won't remove material, just smooths the surface.
🖨️ Final polish on sanded PLA for a semi-gloss finish
🖨️ Buffing painted prints
🖨️ Polishing transparent/translucent filaments
All materials: 18-25K RPM • Use with polishing compound
📀 Sanding Discs
3 included (with mandrel)
Small circular sandpaper discs that mount on a mandrel shaft. Good for flat and gently curved surfaces. Multiple grits available as replacements.
🖨️ Sanding flat surfaces (tops, bottoms)
🖨️ Smoothing large flat support contact areas
🖨️ Quick layer line removal on accessible faces
15-18K RPM for PLA • 18-22K for PETG/ABS
🔩 Drill Bits
3 included — Various diameters
Standard twist drill bits for making holes. Useful for enlarging undersized holes, adding mounting points, or cleaning up holes that closed during printing.
🖨️ Opening up screw holes that printed too tight
🖨️ Adding ventilation or mounting holes post-print
🖨️ Cleaning out support material from holes
15-20K RPM • Go slow, let the bit do the work
🔧 Mandrel + Wrench
1 mandrel, 1 wrench
The mandrel holds sanding discs and other disc-shaped accessories. The wrench helps tighten/loosen the collet nut securely.
Essential for swapping accessories safely
—
5. Support Removal
Step-by-Step Support Removal
1
Break Away the Bulk
Grab the support structure with needle-nose pliers and rock it back and forth. Don't yank — apply steady pressure and let it snap at the contact points. For tree supports, they usually pop off cleanly with a twist.
2
Trim the Nubs
Use flush cutters to snip any remaining support stubs as close to the surface as possible. Cut at an angle with the flat side of the cutters against the model surface for the cleanest result.
3
Rotary Tool — Diamond Point (Cone or Cylinder)
With the F2 Master at Level 2-3 (15-18K RPM), use a diamond cone point to grind down any remaining nubs flush with the surface. Use light, sweeping motions — don't stay in one spot or you'll create a divot. The cone shape lets you reach into tight corners where supports connected.
4
Blend the Contact Points
Switch to a rubber polishing point and blend the ground area into the surrounding surface. This removes the scratch marks left by the diamond bit and creates a more uniform finish.
PLA-S (Support PLA) vs Regular PLA Supports
PLA-S Support Material
- Designed to break away cleanly
- Lower adhesion to main material
- Leaves smoother contact surfaces
- Usually just step 1-2 needed
- Worth it for complex geometry
Regular PLA Supports
- Bonds more strongly — harder to remove
- May take chunks of surface with it
- Rougher contact surfaces
- Full 4-step process usually needed
- Use higher Z-distance (0.2mm+) in slicer to compensate
6. Sanding & Smoothing
The Grit Progression
Always work from coarse to fine. Skipping grits leaves scratches that finer grits can't remove.
120Aggressive
220Rough
400Medium
600Fine
800Very Fine
1000Ultra Fine
2000Polish
| Grit | Purpose | When to Use |
|---|
| 120-180 | Heavy material removal | Thick support scars, major layer lines, reshaping |
| 220-320 | Shape refinement | Smoothing after rough cleanup, removing visible steps |
| 400-600 | Surface smoothing | Eliminating scratches from coarser grits, prep for painting |
| 800-1000 | Fine finishing | Near-smooth surface, minimal visible lines — good enough for most displays |
| 1500-2000 | Mirror prep | Pre-polish, ultra-smooth feel, prep for clear coat |
Wet vs Dry Sanding
🏜️ Dry Sanding
- Faster material removal
- Easier to see progress
- Creates dust (wear a mask!)
- Sandpaper clogs faster
- Best for: coarse grits (120-400)
💧 Wet Sanding
- No dust — cleaner and safer
- Smoother finish (water acts as lubricant)
- Sandpaper lasts longer (no clogging)
- Slightly slower
- Best for: fine grits (600+) and final finish
💡
Pro tip: Sand in circular motions, not back and forth. Linear sanding creates directional scratches that are visible. Circular motions distribute the scratch pattern evenly, making the surface look uniformly smooth.
7. Rotary Tool Techniques for 3D Prints
The Golden Rules
- Let the tool do the work. Light pressure only. Pushing hard melts PLA and creates gouges.
- Keep moving. Never stay in one spot for more than 1-2 seconds. Constant motion prevents heat buildup.
- Start slow, increase speed. Begin at Level 2 (15K RPM) and only go higher if needed.
- Test on a sacrificial print first. Practice on a failed print before touching your masterpiece.
- Wear safety glasses. Bits can throw tiny plastic chips. Always.
Technique: Layer Line Removal
Tool: Sanding disc or rubber polishing point at Level 2-3 (15-18K RPM)
Method: Hold the tool at a ~30° angle to the surface. Move along the layer lines (not across them) with light, overlapping strokes. The goal is to shave the peaks off the ridges without digging into the valleys.
Follow up: Hand sand with 400-grit to blend, then 800-grit for smooth finish.
Technique: Seam Line Cleanup
Tool: Diamond cylinder point at Level 2 (15K RPM)
Method: The Z-seam creates a visible vertical line on your print. Run the cylinder point along the seam using the flat edge, applying minimal pressure. You're shaving off the tiny blobs where each layer started/ended.
Pro tip: Set seam position to "back" in your slicer to put it in the least visible spot.
Technique: Brim/Raft Scar Removal
Tool: Sanding disc → rubber polishing point
Method: After peeling the brim, there's often a rough edge around the bottom of the print. Use the sanding disc flat against the bottom edge, rotating the print as you go. Switch to rubber polishing to smooth. Finish with hand sanding if needed.
Technique: Hole Cleanup
Tool: Drill bit (matching diameter) or diamond ball point
Method: Holes often print slightly undersized. Use a drill bit one size larger than the hole, running at Level 2-3 (15-18K RPM), and slowly bore through. For non-circular cleanup, use a diamond ball point to smooth the interior walls.
Technique: Stringing Removal
Tool: Quick pass with a heat gun (preferred) or diamond needle point at Level 1 (12K RPM)
Method: For light stringing, a brief pass with a heat gun melts the thin strings away. For heavy stringing or if you don't have a heat gun, use the finest diamond point at the lowest speed to carefully pick away strings. A craft knife also works well here.
Technique: Elephant Foot Correction
Tool: Sanding disc or diamond cylinder at Level 2-3
Method: The first layer often squishes out wider than the rest (elephant foot). Hold the print upside down and sand the protruding edge of the first layer flush with the walls above it. The sanding disc works best for this flat, consistent removal.
Prevention: Set elephant_foot_compensation to 0.1-0.2mm in your slicer.
8. Advanced Finishing
Painting Prep
1
Sand to 400-600 grit
Paint needs tooth to grip. 400-grit gives the right balance of smoothness and texture for primer adhesion.
2
Apply filler primer
Use a sandable filler primer (like Rust-Oleum 2-in-1). This fills tiny layer lines that sanding missed. Apply 2-3 thin coats, letting each dry completely.
3
Sand the primer
Wet sand with 800-grit between primer coats. This creates a glass-smooth base for paint.
4
Paint and clear coat
Multiple thin coats > one thick coat. Always. Finish with a matte or gloss clear coat for durability.
Polishing for Gloss
For a glossy, almost injection-molded look without paint:
- Sand progressively to 2000 grit (wet)
- Apply plastic polish (Novus #2 or similar) on a soft cloth
- Use F2 Master with leather polishing wheel at Level 1-2 (12-15K) with polishing compound
- Buff by hand with microfiber cloth for final shine
Gap Filling
For cracks, gaps between parts, or deep support scars:
- CA glue (super glue) + baking soda — Apply thin CA glue, sprinkle baking soda, repeat. Creates a rock-hard fill that sands beautifully. The F2 Master with a sanding disc can level it quickly.
- Auto body filler (Bondo) — For large gaps. Apply, let cure 15 min, sand smooth.
- 3D pen — Fill with matching filament for color-matched repairs.
9. Material-Specific Tips
PLA
The easiest to work with but melts at low temps (~60°C)
- Use F2 Master at Level 2-3 (15-18K) MAX
- Light pressure — PLA melts and smears easily
- Sands beautifully from 220 grit up
- Wet sanding recommended for fine grits
- Accepts primer and paint very well
- CA glue + baking soda for filling
PETG
Tougher than PLA, slightly flexible, strings more
- More heat resistant — can use Level 3-4 (18-20K)
- Tends to string rather than chip — remove strings first
- Harder to sand — requires more pressure
- Start at 120 grit for heavy cleanup
- Harder to paint (low surface energy)
- Flame polish works well for edge cleanup
ABS
Strong, heat resistant, can be acetone-smoothed
- Most forgiving for rotary tools — higher heat tolerance
- Can use Level 4-5 (20-25K) safely
- Sands easily and cleanly
- Acetone vapor smoothing — eliminates all layer lines chemically (no sanding needed!)
- Acetone welding for joining parts
- Use in ventilated area (fumes)
TPU (Flexible)
Flexible/rubber-like — very different cleanup approach
- DO NOT use rotary tool at high speed — melts/deforms instantly
- Level 1 only (12K) if you must use rotary
- Craft knife for trimming supports — clean cuts work best
- Minimal sanding — 400+ grit wet only
- Heat gun removes stringing well
- Accepts very little post-processing
10. Safety
⚠️ Required Safety Equipment
- Safety glasses — Always. Bits throw plastic chips at high speed. Non-negotiable.
- Dust mask / N95 — PLA dust is not good for your lungs. Use when sanding (especially dry).
- Ventilation — Open a window or use a fan. Critical for ABS (toxic fumes when heated).
- Secure the workpiece — Hold with pliers, clamp, or a vise. Never hold a small part in one hand while using the rotary tool with the other.
🔥 Heat Awareness
| Material | Glass Transition | Melting Point | Max Comfortable RPM |
|---|
| PLA | ~60°C | ~180°C | 18,000 (Level 3) |
| PETG | ~80°C | ~260°C | 20,000 (Level 4) |
| ABS | ~105°C | ~240°C | 25,000 (Level 5) |
| TPU | varies | ~220°C | 12,000 (Level 1) |
11. Troubleshooting Common Cleanup Issues
| Problem | Cause | Fix |
|---|
| Plastic melting/smearing while grinding | Too much RPM or pressure | Drop to Level 1-2, use lighter touch, intermittent passes |
| Gouges/divots from rotary tool | Staying in one spot too long | Keep the tool moving constantly; wider sweeping passes |
| Scratches visible after sanding | Skipped grits in progression | Go back and sand with intermediate grits (don't skip 400 to 800) |
| Support left holes/scars in surface | Support Z-distance too small | Fill with CA + baking soda, sand smooth. Increase Z-distance for next print |
| White stress marks when removing supports | Pulling too hard/fast | Rock gently, use heat to soften adhesion point first |
| Sanding disc keeps coming loose | Mandrel not tight enough | Use the included wrench, tighten firmly. Replace worn mandrel |
| Layer lines still visible after sanding | Didn't start coarse enough | Start at 120-180 grit. The initial pass does 80% of the work |
| Surface looks cloudy after sanding | Fine scratches scattering light | Continue to 1500-2000 grit, then polish or clear coat |
| Part broke during cleanup | Thin walls or too much pressure | Increase wall count in slicer (3-4 walls); support part while working |
| F2 Master bit slipping in collet | Wrong shank size or loose collet | Verify 3/32" (2.3mm) shank; lock shaft, then tighten collet nut firmly |
12. Surface Smoothing with the Fanttik F2 Master
This section is your hands-on guide to taking a rough, layer-lined 3D print and making it smooth. Grab your F2 Master kit — we'll help you identify every accessory by sight and walk through the exact workflow.
🔍 Visual Accessory Identification Guide
Open your RevoStor hub. Here's how to identify every accessory type by sight and touch:
💎 Diamond Wheel Points — 13 pieces, your PRIMARY smoothing tools
These all have a sparkly, glittery coating — that's industrial diamond. They feel rough like sandpaper. Each shape is designed for different surface geometries:
Cylinder
× 2 included
🔎 Straight-sided rod with flat top & bottom — like a tiny sparkly pencil
Best for: Flat surfaces, edges, brim scars, Z-seam lines
Ball / Sphere
× 2 included
🔎 Round ball on a thin shaft — like a tiny sparkly lollipop
Best for: Concave curves, inside corners, sockets, rounded cavities
Cone
× 3 included
🔎 Pointed triangle that widens from tip to base — like a tiny Christmas tree
Best for: V-grooves, tight corners, engraving lines, sharp interior angles
Flame
× 3 included
🔎 Teardrop/torpedo shape — wider in middle, tapered both ends — like a candle flame
Best for: Blending, general smoothing, reaching into curves, the go-to all-rounder
Needle
× 3 included
🔎 Very thin, long pointed shape — like a sewing needle with sparkles
Best for: Fine detail work, tiny holes, delicate cleanup, thin slots
🔧 Other Accessories — finishing, polishing & utility
Carving Bits
× 3 included
🔎 Fluted steel with spiral grooves — look like tiny drill bits but with sharper, angled flutes
Best for: Aggressive support removal, shaping, hollowing. They cut, not grind.
Rubber Polishing Points
× 2 included
🔎 Solid dark rubber, soft to the touch, no sparkle. Squeeze it — it has give.
Best for: Medium smoothing, removing micro-scratches from diamond, blending surfaces
Sesame Polishing Points
× 2 included
🔎 Gritty grey/brown, slightly rough. Feels between rubber and diamond — stone-like.
Best for: Penultimate finish before leather. Aluminum oxide abrasive — finer than diamond.
Cowhide / Leather Polishing Wheels
× 2 included
🔎 Tan/brown flat discs, leather texture. Smells like leather. Flexible.
Best for: Final gloss polish with compound. The gentlest tool — won't remove material.
Sanding Discs
× 3 included
🔎 Flat circles of sandpaper — attach to the mandrel with a screw
Best for: Flat surface sanding, brim scars, elephant foot correction
Drill Bits
× 3 included
🔎 Standard metal twist drill shape — pointed tip, spiral flutes up the shaft
Best for: Opening undersized holes, adding mounting points, clearing support from holes
Mandrel
× 1 included
🔎 Metal shaft with a small screw/nut on top — the holder for disc accessories
Best for: Mounting sanding discs and polishing wheels. Not a tool by itself.
Wrench
× 1 included
🔎 Small flat metal wrench — open jaw at one end
Best for: Tightening/loosening the collet nut when swapping accessories
🛠️ Step-by-Step Surface Smoothing Workflow
Going from "rough print with visible layer lines" to "smooth, clean finish":
👆 Assess
surface
→
💎 Diamond
grinding
→
🟤 Rubber
polishing
→
🟡 Sesame
finishing
→
🟫 Leather
buffing
→
💧 Wet sand
(optional)
Run your fingernail across the surface. What do you feel?
- Sharp ridges you can catch your nail on? → Start at Step 2 (diamond grinding)
- Gentle bumps, barely-there texture? → Skip to Step 3 (rubber polishing)
- Only visible, not tactile? → Skip to Step 4 (sesame finishing)
💡
Don't over-process. If it already feels smooth and you just want a gloss finish, jump straight to leather + polishing compound.
Pick your bit based on surface shape:
- Curved surfaces → 💎 Diamond Flame (the teardrop-shaped sparkly one)
- Flat areas → 💎 Diamond Cylinder (the straight rod sparkly one)
- Inside corners → 💎 Diamond Cone (the Christmas tree one)
Settings & technique:
⚡ Level 2 — 15,000 RPM (for PLA)
- Hold at 30–45° angle to the surface — not perpendicular
- Use LIGHT pressure — let the diamond coating do the work, don't push
- Move in ONE direction along the layer lines (not against them)
- Work in 2–3 second passes, then lift. Check progress. Repeat.
- Overlap each pass slightly to avoid creating steps
🔥
HEAT WARNING: If the plastic gets shiny/gummy, STOP immediately. Let it cool for 10 seconds. You're melting it. Back off the pressure, or drop to Level 1. PLA softens at just 60°C — friction heat reaches that fast.
Now switch to the 🟤 Rubber Polishing Point (the dark, soft one with no sparkle — squeeze it, it has give)
⚡ Level 3 — 18,000 RPM (rubber is gentler, higher RPM is safe)
- Switch to circular motions now (not linear like the diamond step)
- This removes the micro-scratches left by the diamond bits
- The surface should start feeling uniformly smooth — no individual lines
- Moderate pressure is okay here — rubber is forgiving
Sesame polishing point for penultimate finish:
🟡 Sesame Point ⚡ Level 2–3 (15–18K)
- Gentle circular motions — you're refining, not removing
- Surface should feel silky smooth to the touch
Leather wheel for glossy finish (optional):
🟫 Leather Wheel ⚡ Level 3–4 (18–20K)
- Apply a tiny amount of polishing compound to the leather disc
- Light, sweeping passes across the surface
- This creates a semi-gloss to glossy finish
If you want a near-mirror finish, put down the rotary tool and go manual:
- 400–600 grit wet sandpaper by hand for any remaining imperfections
- 800–1000 grit wet for very smooth, paint-ready surface
- 1500–2000 grit wet for near-mirror finish
- Keep the surface wet — dip the sandpaper in water frequently
- Finish with a microfiber buff or clear coat for protection
📊 Material-Specific RPM Quick Reference
Different filaments have different heat tolerances. Use this table to set your F2 Master speed:
| Material | Max Level | Max RPM | Notes |
|---|
| PLA |
Level 3 |
18,000 |
Melts easily — light touch required. Most common material. |
| PLA-S |
Level 3 |
18,000 |
Same as PLA. Support contact areas may be softer — go easy. |
| PETG |
Level 4 |
20,000 |
More heat resistant. Can push harder. Watch for stringing. |
| ABS |
Level 5 |
25,000 |
Highest tolerance. Can also acetone vapor smooth instead. |
| TPU |
Level 1 |
12,000 |
Flexible — grabs the bit. Be very careful. Knife often better. |
⚠️
When in doubt, start low. You can always increase RPM. You can't un-melt plastic. Begin at Level 1–2 for any material you haven't worked with before.
❌ Common Mistakes (and How to Avoid Them)
💥
Pushing too hard — Melts PLA instantly, creates divots and shiny patches
✅ Fix: Let the diamond coating do the cutting. Your job is to guide, not push. If it's not cutting, your bit is worn — replace it.
🔄
Using wrong bit shape — Cylinder on curves creates flat spots; ball on flats creates divots
✅ Fix: Match bit shape to surface geometry. Flame for curves, cylinder for flats, cone for corners.
⏱️
Staying in one spot too long — Creates a visible divot or groove
✅ Fix: Keep moving! 2–3 second passes, then lift and check. Never hover in one place.
🔥
Going too fast (RPM) for PLA — Friction heat melts the surface into gummy mess
✅ Fix: Stay at Level 2 (15K) for PLA. Only go to Level 3 with rubber/sesame bits.
⏩
Skipping from diamond straight to leather — Leaves visible micro-scratches under the polish
✅ Fix: Always go through the progression: Diamond → Rubber → Sesame → Leather. Each step removes the scratches from the previous one.
↕️
Sanding against the layer lines — Creates cross-hatched scratches that are harder to remove
✅ Fix: During diamond step, move ALONG the layer lines. Switch to circular only at rubber step and beyond.
🔇
Not testing on a sacrificial print first — Ruining your masterpiece on the first try
✅ Fix: Grab a failed print or print a test cube. Practice your pressure and speed before touching anything important.