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Black

Maker and homelabber. I write practical guides on 3D printing, home servers and budgeting for new parents.

What a dog or cat really costs: year one, every year after, and the vet bill nobody budgets

What a dog or cat really costs: year one, every year after, and the vet bill nobody budgets

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2 min read

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Recipe cost per serving: unit conversion without lying about cups vs grams

Recipe cost per serving: unit conversion without lying about cups vs grams

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2 min read
The 52-week savings challenge, solved for any goal (and two JavaScript date bugs)

The 52-week savings challenge, solved for any goal (and two JavaScript date bugs)

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2 min read
Truck, container or movers? What a move really costs, plus the bills nobody quotes

Truck, container or movers? What a move really costs, plus the bills nobody quotes

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2 min read
What a baby's first year really costs, split into the three buckets you can plan for

What a baby's first year really costs, split into the three buckets you can plan for

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2 min read
Debt snowball vs avalanche: settling it with a 40-line JavaScript simulation

Debt snowball vs avalanche: settling it with a 40-line JavaScript simulation

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3 min read
What your car really costs per mile (the line most people leave out)

What your car really costs per mile (the line most people leave out)

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2 min read
How to calculate your freelance hourly rate backwards from take-home pay

How to calculate your freelance hourly rate backwards from take-home pay

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3 min read
How to check the 50/30/20 rule in Excel or Google Sheets (with formulas)

How to check the 50/30/20 rule in Excel or Google Sheets (with formulas)

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3 min read
Reading 3D printer G-code in the browser: slicer comment formats and a price calculator with no upload

Reading 3D printer G-code in the browser: slicer comment formats and a price calculator with no upload

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3 min read
Christmas gift budget in a spreadsheet: per-person totals, a late-package alert, and the formulas

Christmas gift budget in a spreadsheet: per-person totals, a late-package alert, and the formulas

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3 min read
Generating a mirror-twin line puzzle: pair-aware pruning and a separator that was secretly a cell

Generating a mirror-twin line puzzle: pair-aware pruning and a separator that was secretly a cell

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4 min read
Your Real Hourly as a Delivery Driver: Spreadsheet Formulas for Gas, Mileage and Tax

Your Real Hourly as a Delivery Driver: Spreadsheet Formulas for Gas, Mileage and Tax

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3 min read
How to Price Resale Items So You Actually Hit Your Profit (Excel and Google Sheets)

How to Price Resale Items So You Actually Hit Your Profit (Excel and Google Sheets)

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3 min read
What does a 3D print really cost? Spreadsheet formulas for pricing prints

What does a 3D print really cost? Spreadsheet formulas for pricing prints

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3 min read
Building a printable invoice from a table in Excel and Google Sheets (no FILTER, no macros)

Building a printable invoice from a table in Excel and Google Sheets (no FILTER, no macros)

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2 min read
Spreadsheet formulas for a landlord rent roll (that handles early and late rent)

Spreadsheet formulas for a landlord rent roll (that handles early and late rent)

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3 min read
Generating daily path puzzles with exactly one solution (backbite, parity pruning and clue minimization)

Generating daily path puzzles with exactly one solution (backbite, parity pruning and clue minimization)

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4 min read
Quarterly estimated taxes in a spreadsheet: uneven IRS periods, year-to-date SUMIFS and the 92.35% rule

Quarterly estimated taxes in a spreadsheet: uneven IRS periods, year-to-date SUMIFS and the 92.35% rule

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3 min read
What Etsy actually takes from a sale, and the spreadsheet formulas to price around it

What Etsy actually takes from a sale, and the spreadsheet formulas to price around it

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3 min read
Turning a weekly meal plan into an aisle-sorted grocery list with plain spreadsheet formulas

Turning a weekly meal plan into an aisle-sorted grocery list with plain spreadsheet formulas

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3 min read
A seating chart that fills itself: TEXTJOIN, SMALL+ROW tie-breakers and date-relative checklists in a spreadsheet

A seating chart that fills itself: TEXTJOIN, SMALL+ROW tie-breakers and date-relative checklists in a spreadsheet

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3 min read
Auto-categorizing bank transactions and simulating a debt snowball with plain spreadsheet formulas

Auto-categorizing bank transactions and simulating a debt snowball with plain spreadsheet formulas

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3 min read
A 3D-printable folding chair-height stool: knees, gravity locks and a seat contour in Python

A 3D-printable folding chair-height stool: knees, gravity locks and a seat contour in Python

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3 min read
Growing a coral reef desk organizer with signed distance functions in numpy

Growing a coral reef desk organizer with signed distance functions in numpy

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4 min read
Modelling a mimic chest dice box in Python: interlocking fangs and a filament hinge

Modelling a mimic chest dice box in Python: interlocking fangs and a filament hinge

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4 min read
A signed distance function for a snail shell (log spiral) that became a 3D printed planter

A signed distance function for a snail shell (log spiral) that became a 3D printed planter

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3 min read
Growing fake tree rings in numpy: a 3D printed coaster where no two match

Growing fake tree rings in numpy: a 3D printed coaster where no two match

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3 min read
The moon always shows the same face, so my 3D printed moon phases do too (Python SDF)

The moon always shows the same face, so my 3D printed moon phases do too (Python SDF)

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3 min read
One sine wave makes a true over-under celtic knot (3D printable, Python + manifold3d)

One sine wave makes a true over-under celtic knot (3D printable, Python + manifold3d)

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3 min read
The Tusi couple: 8 beads in straight lines that roll as a circle (3D printable, Python)

The Tusi couple: 8 beads in straight lines that roll as a circle (3D printable, Python)

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3 min read
A true over-under Celtic knot and tree-ring coasters in Python (3D printable)

A true over-under Celtic knot and tree-ring coasters in Python (3D printable)

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3 min read
Four 3D-printable creatures from Python signed distance functions (bark, scutes, tentacles, bones)

Four 3D-printable creatures from Python signed distance functions (bark, scutes, tentacles, bones)

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4 min read
The Tusi couple in Python: 8 beads in straight lines that roll as a circle

The Tusi couple in Python: 8 beads in straight lines that roll as a circle

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2 min read
What I learned listing my first STL files on Cults3D (before any sale)

What I learned listing my first STL files on Cults3D (before any sale)

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1 min read
Generate print-in-place flexi toys with Python and manifold3d

Generate print-in-place flexi toys with Python and manifold3d

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2 min read
Print-in-place gimbal rings in Python: cone pins that never fuse (manifold3d)

Print-in-place gimbal rings in Python: cone pins that never fuse (manifold3d)

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2 min read
3 print-in-place animals: tongue-flick frog, flexi axolotl and flexi octopus

3 print-in-place animals: tongue-flick frog, flexi axolotl and flexi octopus

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2 min read
Cut a spider web into a 3D-printable bowl with Python (manifold3d)

Cut a spider web into a 3D-printable bowl with Python (manifold3d)

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3 min read
Carve a jack-o'-lantern in Python with signed distance functions (manifold3d)

Carve a jack-o'-lantern in Python with signed distance functions (manifold3d)

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3 min read
4 holiday 3D print sets you can print this week (place cards, coasters, cutters)

4 holiday 3D print sets you can print this week (place cards, coasters, cutters)

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1 min read
Hyperbolic tiling in Python: draw Escher's Poincare disc and 3D print it

Hyperbolic tiling in Python: draw Escher's Poincare disc and 3D print it

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2 min read
Gosper curve in Python: a space-filling L-system ornament for 3D printing

Gosper curve in Python: a space-filling L-system ornament for 3D printing

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2 min read
Penrose tiling in Python: generate a 3D-printable aperiodic ornament

Penrose tiling in Python: generate a 3D-printable aperiodic ornament

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2 min read
Generate 3D-printable ornaments in Python: torus knots and golden-angle petals

Generate 3D-printable ornaments in Python: torus knots and golden-angle petals

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2 min read
7 Christmas 3D Prints to Start Now (Advent Calendar, Ornaments, Cookie Cutters)

7 Christmas 3D Prints to Start Now (Advent Calendar, Ornaments, Cookie Cutters)

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2 min read
3D Print a Reusable Advent Calendar: 24 Boxes, Settings and Time Budget

3D Print a Reusable Advent Calendar: 24 Boxes, Settings and Time Budget

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2 min read
How to 3D Print Cookie Cutters That Actually Work (Settings + Free Recipe)

How to 3D Print Cookie Cutters That Actually Work (Settings + Free Recipe)

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2 min read
Plan a Week of Dinners in 15 Minutes (and Stop Ordering Takeout)

Plan a Week of Dinners in 15 Minutes (and Stop Ordering Takeout)

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1 min read
Calibrate a 3D Printer in the Right Order: An 8-Step Checklist

Calibrate a 3D Printer in the Right Order: An 8-Step Checklist

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2 min read
A 10-Minute Cleaning Routine That Actually Sticks (With a Weekly Focus Schedule)

A 10-Minute Cleaning Routine That Actually Sticks (With a Weekly Focus Schedule)

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1 min read
How to Plan Holiday Spending on Paper: A 20-Minute Method

How to Plan Holiday Spending on Paper: A 20-Minute Method

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1 min read
Document Your Home Lab in One Hour: A Simple Structure That Works

Document Your Home Lab in One Hour: A Simple Structure That Works

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2 min read
Print Christmas Ornaments in 20 Minutes: Settings and Six Flat Designs

Print Christmas Ornaments in 20 Minutes: Settings and Six Flat Designs

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1 min read
9 Useful 3D Prints Under 3 Hours: Settings, Sizes and Tips

9 Useful 3D Prints Under 3 Hours: Settings, Sizes and Tips

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2 min read
52-week savings challenge: the numbers, three easier versions and a printable tracker

52-week savings challenge: the numbers, three easier versions and a printable tracker

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1 min read
Find Minecraft server lag with LagLens and cap it with CapLimit

Find Minecraft server lag with LagLens and cap it with CapLimit

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1 min read
Special Mobs Revived: 148 monster variants on Fabric 26.2

Special Mobs Revived: 148 monster variants on Fabric 26.2

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1 min read
Tale of Kingdoms: The Shattered Crown, an RPG campaign mod for Minecraft 26.2

Tale of Kingdoms: The Shattered Crown, an RPG campaign mod for Minecraft 26.2

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1 min read
Fallen Star: rare starfall nights and a boss fight in Minecraft 26.2

Fallen Star: rare starfall nights and a boss fight in Minecraft 26.2

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1 min read
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