Video summary

It took me 16 Years to learn this...

Main summary

Key takeaways

Technology

Overview

This video is a fast but detailed “master guide” to FDM (plastic-melting) 3D printing, packing 16 years of 3D-printing/design experience into 63 practical tips.

It covers:

  • Printer types
  • Material choice
  • Slicer workflow and settings
  • Troubleshooting
  • How to design parts for better prints (fit, strength, text quality, reduced supports)

It also mentions several creator-specific tools/files sold or hosted on the speaker’s site.

3D Printer Types + Recommended Starter

Common technologies

  • FDM: melts plastic with a hot nozzle (recommended starter)
  • Resin (light-curing)
  • Lasers for metal
  • Extruding concrete

Starter advice

Tip 1: Start with FDM because it’s cheapest, safest, and least messy.

FDM basics

  • A hot nozzle melts filament
  • The printer deposits it onto a build plate
  • Printer behavior is compared to a glue gun

Models & Sending Files to the Printer

Getting models

  • Download existing designs
  • Create your own

Tip 2: You don’t need to model—there are many ready-to-print models on sites like Printables and MakerWorld (also mentions the creator’s own shop/website).

Build Plate Adhesion & Surface Prep

Cleaning workflow

  • Keep the build plate clean (dish soap + water)
  • Don’t touch with bare fingers (oil prevents sticking)

Optional adhesion aids

  • Glue stick coat before prints (helps sticking + later removal)
  • Liquid glue option exists (less sticky, costs more)

If prints fail: first diagnosis

  • Usually check: did it stick correctly?
    • Corners and edges lifting are key warning signs

Filament / Material Guidance

PLA

  • Cheapest, easiest
  • Strong enough for many projects
  • Used heavily in examples (e.g., cases, camera arm, boxes)

PETG

  • Better outdoors / UV resistance
  • Withstands about ~70°C
  • Easier after PLA than many other materials
  • Needs drying before printing

“Harder” materials

  • More hassle: higher temps, drying/storage, and enclosures/heated printers
  • Carbon/glass-filled materials:
    • Abrasive (wears nozzles)
    • Often require better nozzles

Drying Filament

  • Mentions dedicated filament dryers and printer-integrated drying systems (AMS-type features)
  • Also covers a workaround:
    • Use build plate heat + covering (for materials like PETG/ABS)

Slicers & Profiles

What a slicer does

  • Converts 3D files into layer instructions
  • Produces machine-ready movement commands

Recommended approach

  • Use the slicer profile recommended by your printer manufacturer
  • Select the right material profile (sets temps and movement speeds)

Ecosystem tuning benefit

  • If using major ecosystems (e.g., Prusa/Creality/Bambu), using their filament can help because their profiles are tuned.

Slicer Settings That Affect Speed & Quality

Layer height

  • Higher layer height → faster, rougher
  • Lower layer height → slower, smoother
  • Adaptive layers: thin layers only where detail requires it

Infill vs strength strategy

  • Decorative parts: about ~5% infill
  • For strength:
    • Prefer more perimeters/walls over higher infill
    • ~15–20% infill is often enough

Nozzle size upgrade (older printers)

  • Common 0.4 mm nozzle → swap to 6–8 mm for faster printing with similar quality
  • Less relevant on newer fast printers

Advanced Slicing Workflow Tips

  • Enable advanced mode (downloaded files may hide settings there)
  • Split objects if a file contains multiple glued-together objects
  • For large parts that exceed limits:
    • Chop into pieces, glue back together
    • Use connectors and alignment aids
    • Use slicer modifiers to add infill only where needed

Supports

  • Two approaches:
    • Tree vs normal
  • Prefer tree supports unless the supported surface is perfectly flat and can be supported directly from the build plate
  • For normal supports: set to “snug”

Bridging

  • Printers can bridge gaps without supports sometimes
  • Test how far your printer can bridge acceptable surfaces

Multi-function printing

  • Add text directly in slicer
  • Color changes can massively increase time and waste, especially with single-nozzle printers due to layer-by-layer switching

Multi-Color & Multi-Material Techniques

Multi-color without extra hardware

  • Use manual pause at a chosen layer height
  • Swap filament, then resume

“Incompatible filament as support” idea

  • PETG as support for PLA, or PLA as support for PETG can work
  • Requires multi-nozzle/multi-material printers
  • Single-nozzle printers may produce weak transitions

Speed Optimization “Secret”: Line Width

  • Optimization: manually set line width in slicer independent of nozzle size
  • Example:
    • For a uniform 1.5 mm thick wall, set line width to 0.75 mm even with a 0.4 mm nozzle
    • Reduces revolutions/passes → faster prints

Troubleshooting & Diagnosing Failures

Ordered checks / likely causes

  1. Not sticking
    • Use brim (especially small-surface parts)
    • Or use “dog ears” for large flat parts where corners lift
  2. If adhesion persists:
    • Check room temperature (~20–25°C suggested)
  3. Quality mismatch:
    • Print a benchmark/test model (“bench”) to separate printer issues vs slicer/settings issues
  4. “Spaghetti” / incomplete prints:
    • Usually bed adhesion failure, insufficient supports, or warping knocking the part loose
  5. Layer defects / poor filling:
    • Likely clogged nozzle or printing too fast
    • Fix: clean nozzle or replace nozzle
    • “Cold pull” as first cleaning attempt
    • If still bad: deeper calibration (points to another creator’s calibration video)

Brim cleanup detail

  • Mentions deburring tool guidance (from CNC Kitchen)

Designing for 3D Printing (CAD + Geometry Strategies)

Use 3D printing in a bigger workflow

  • Tooling/molds
  • Templates
  • Custom manufacturing aids

Overhang-aware shaping rules

  • Chamfers over fillets at bottoms
    • Fillets can create problematic overhang starts on the bottom
    • Chamfer bottoms avoid those artifacts
    • Suggested: 45° chamfers

Smooth appearance without overhang problems

  • Combine chamfer + fillet
  • Add small finishing fillets/chamfers for better feel and appearance

Alignment features

  • Model holes for wooden dowels to align large assemblies reliably (IKEA-like)
  • Print only changed sections when iterating large designs

Using Off-the-Shelf Hardware for Functionality

  • Prefer integrating nuts/bolts instead of complex all-printed mechanisms
  • If nut access from the backside isn’t possible:
    • Use a square-knot / rectangular hole trick so the nut can slide in from the side
  • Design-board templates mentioned as free downloads on alch.shop (e.g., M6 counterbore bolts)

Threading alternative

  • Heat-set inserts are acknowledged (less preferred but common)

Print Orientation & Strength Direction

  • Parts have a weak and strong direction due to layer bonding
  • Example: handles are better printed “laying flat” so strength direction matches expected loads
  • General rule: orient so the weak direction won’t snap

Support Reduction & Printability-Driven Geometry

  • For thin/odd parts that don’t adhere well:
    • Model breakaway supports into the design
  • Don’t over-engineer “injection-mold” cost-saving features:
    • Blocky printed geometry can be stronger (infill stiffens internal structure)

Reduce supports by design

  • Keep overhang planning to 45–60° max
  • Angle the whole part so overhangs stay within limits (sometimes eliminating supports)
  • Use calibration/test prints to determine:
    • Overhang limits
    • Bridge capability
    • Tolerances

Precision Holes & Fit/Tolerance Guidance

Why holes are hard

  • Circular regions can produce layers with heavy overhangs → imprecise holes

Proposed geometry solutions

  • Use a T-like shape (around 60° overhangs) instead of problematic circular overhang sections
  • For embedding nuts:
    • Add tiny “foundation” walls (~0.2 mm thick) in two directions

Tolerances

  • For snug but movable fit: start around ~2 mm gap
    • (Depends on printer/material/orientation)
  • Side holes/screws tend to shrink due to overhang effects

Calibration and finishing

  • Download free hole calibration boards to empirically find hole sizes that print correctly
  • For precise holes:
    • Use reamers
    • Print holes slightly undersized (~0.5 mm too small) then ream for best fit and surface finish

Assembly and flex features

  • Interlocking parts: design geometry so pieces assemble with minimal/no moving parts
  • Flexible mechanisms: use printed flex features like snap locks instead of traditional moving assemblies

Cleanest 3D Printed Text Method

Don’t print text as the only thing.

Instead:

  • Print the surrounding area first, leaving text recessed/embedded
  • Crisp edges result from line-width behavior and layered contrast
  • Practical reason: printing two contrasting layers close together often looks cleaner than printing only the text layer

Speed workflow suggestion:

  • If using different text colors, split the model so only one contrasting part uses the second color assignment.

Product / Tool Mentions (Creator-Specific)

alch.shop

Build plans + 3D files, including:

  • Motorbox organizational system (and label generator)
  • Free hardware dimension “design boards”
  • Hole calibration boards
  • Label generator at alch.shop/label
    • Supports icons/symbols/text
    • Exports formats like SDL/3MF

Motorbox label generator details

  • Creates labels with screw-type icons/symbols
  • Supports multiple Motorbox sizes
  • Offers variants (e.g., inverted)

Squarespace sponsor

  • Website building for alca shop via Squarespace (drag-and-drop, design system Blueprint, merchandising features)
  • Promo codes:
    • Free trial + 10% off using squarespace.com/alcch

Main Speaker / Sources

  • Main speaker: the video creator/host/educator, referenced via their websites/files such as alch.shop and alch.shop/label
  • Referenced sources/other creators:
    • Stefan from CNC Kitchen (deburring tool mention)
    • Factorian Designs (linked for deep printer calibration videos)

Original video