Practical calculators and guides for 3D printing hobbyists

Material cost, electricity, print time, failure tracking, and the AMS purge math nobody warns you about. Plus longer guides on picking filament, fixing failures, and what each setting actually does. All free, all in your browser, no sign-up.

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8 min read

Slicer settings that secretly waste filament (fix these first)

Most cost calculators ignore the slicer settings quietly inflating your filament use. Infill type, support style, brim, retraction, and the purge multiplier explained, with the dollar impact of each.

9 min read

How to dry filament: 5 methods compared, with temperatures and times

Wet filament causes more print failures than people realize. Oven, dedicated dryer, food dehydrator, vacuum bag with desiccant, and the methods to skip. Real temps, real times, by material.

9 min read

Best 3D printer under $300 in 2026: honest buyer's guide

Bambu A1 mini, A1, Ender 3 V3 KE, Elegoo Neptune 4 Plus. Real specs, real tradeoffs, and which one matches your situation.

Where to start

I want to know what a print costs

Start with material cost, layer in electricity, then think about failure rate and time.

I'm not sure which filament to use

Compare materials head to head, then read the long-form guide for context.

My prints keep failing

Start by tracking your actual failure rate, then walk the fixes ranked by frequency.

I'm thinking about multi-color (AMS)

Run the purge math first. Multi-color often costs more in wasted filament than the part itself weighs.

I'm buying a printer

The under-$300 buyer's guide covers the realistic options and tradeoffs in 2026.

I want to estimate print time

Quick ballpark before you slice. Plus what makes your slicer estimate often wrong.

How much filament is left on this spool?

Weigh the spool, pick your brand, see the answer. Includes empty-weight presets for Bambu, Polymaker, eSun, and more.

Remaining Filament Calculator

All calculators

Filament Cost

Calculate the material cost of any 3D print from weight and spool price.

Print Time

Estimate how long a print will take based on weight and printer class.

Materials

Compare PLA, PETG, ABS, TPU, and more side by side on price, strength, and temperature.

Electricity

Figure out what each print actually costs to run based on wattage and local rates.

Failure Rate

Track your real-world failure rate and compare it to hobbyist benchmarks.

AMS Purge Waste

How much filament your Bambu AMS is actually wasting on color swaps. The calculator nobody else built.

Remaining Spool

Weigh your spool on a scale and see exactly how much filament is left. Empty-spool weight presets included for Bambu, Polymaker, eSun, and more.

Why this site

The 3D printing community has decent calculators scattered across slicer forums, spreadsheets, and app stores, but nothing focused, fast, and mobile-friendly. filamentcalcs.com is a single place for the calculations you actually do, usually while standing next to your printer with your phone out.

Every calculator runs in your browser. Nothing is saved to a server. URLs encode your inputs, so you can bookmark a result or paste it in a Reddit reply. For the formulas behind each tool and the source data, see the methodology page.

Common questions

Are the calculators actually free?: Yes. No sign-up, no email collection, no paid tier. The site runs Google AdSense to offset hosting costs and time spent maintaining the calculators.
How accurate are these compared to my slicer?: For material cost, electricity, and AMS purge, the calculators are accurate to within a few percent for typical inputs. For print time, they're intentionally rough; your slicer simulates every move and is always the authoritative source for time on a specific file. The methodology page documents the formulas and where they fall apart.
Do you collect my data?: No. Calculator inputs never leave your browser. URLs encode your inputs as parameters so you can bookmark or share, but those URLs are never sent to a server. Standard Google Analytics tracks page views; that's it.
Will you build calculator X?: Maybe. Suggestions feed the build queue. Common requests under consideration: resin printing cost, multi-printer farm economics, enclosure heater power. Email via the contact page.
How often are the calculators updated?: Each calculator is reviewed quarterly to refresh default prices, add new printers as they reach hobbyist relevance, update regional electricity rates, and incorporate reader corrections. Major changes get noted in the relevant page's "How this works" section.
Are you affiliated with any printer or filament brand?: No. No affiliate links, no sponsored placements, no paid product reviews. When a guide names a specific brand or printer, it's because that name is relevant to the topic.
I'm new to 3D printing. Where should I start?: The best printer under $300 guide covers the realistic options for first-time buyers. After you have a printer, the filament comparison and the glossary are good next reads.