Guides & Tutorials
Practical guides to help you calculate costs, price your work, and waste less material. Written for real makers, not engineers.
Soy Wax to Fragrance Oil Ratio
Find the right soy wax to fragrance oil ratio with grams-per-batch tables and the maximum loads published for common container soy waxes.
Apr 15, 2026
Resin Waste Buffer Guide
How much extra epoxy to mix, with manufacturer waste ranges, a 10% default and a table of 5%, 10% and 15% buffers by batch size.
Apr 15, 2026
Resin Pour Calculator Guide
Pour depth per layer, layer-by-layer resin volumes and a worked river table example, with limits taken from manufacturer pages.
Apr 15, 2026
How to Price 3D Prints on ETSY
Price 3D prints on Etsy by costing filament, waste, printer wear, electricity and your time, then adding US Etsy fees with a reverse formula.
Apr 15, 2026
How Much Wax for Candles
Work out how much soy wax a candle container needs from its volume in fluid ounces, with a conversion table, worked examples and batch math.
Apr 15, 2026
How Much Resin for a River Table
Work out how much resin a river table needs from channel length, average width and thickness, with a size table computed from the formula.
Apr 15, 2026
ETSY Profit Margin Calculator
How to work out your real profit margin on an Etsy sale after fees, materials, packaging and your time, with a corrected worked example for US sellers.
Apr 15, 2026
ETSY Fees Explained 2026
Every fee a US Etsy seller pays in 2026: listing, transaction, payment processing and Offsite Ads, with worked examples of what you keep per sale.
Apr 15, 2026
Epoxy Resin Volume Calculator Guide
Convert mold dimensions to cubic inches, fluid ounces and gallons, with worked examples for coasters, trays, river tables and coatings.
Apr 15, 2026
Candle Wick Size Guide by Container
Match a candle wick series to your container diameter with a starting-point chart, melt-pool area figures and a burn-test method for each jar.
Apr 15, 2026
Candle Making Cost Breakdown
Work out what each candle costs to make: wax and fragrance quantities from jar size, worked cost examples, and a table of assumed prices you can replace.
Apr 15, 2026
Candle Fragrance Load Calculator
Calculate fragrance oil for candles as a percentage of wax weight, with ready tables in ounces and grams and the max loads suppliers publish.
Apr 15, 2026
3D Printer Electricity Cost
Work out what a 3D print costs in electricity, with the kWh formula, a cost-per-hour table at common wattages and monthly totals at the 2026 US average rate.
Apr 15, 2026
3D Print Cost Breakdown
A worked 3D print cost breakdown using the same formula as our calculator: filament, electricity, machine wear, a 10% failure buffer and a 2x sell price.
Apr 15, 2026