Tools
Free, browser-based calculators and references. No login. Mobile-friendly. Built by makers, for makers.
Files
Gridfinity Calculator
Drawer size to Gridfinity grid, the baseplates to print for your printer bed, and the tallest bin that fits. Every size and dimension in mm and inches.
Files
Gridfinity Generator
Bins and baseplates generated in your browser, compensated for your printer's real dimensional error so they drop in instead of binding, plus 186 ready-made parts from the open-source libraries. STL and multicolour 3MF.
Files
Lithophane Maker
Photo to printable lithophane, with a physically simulated backlit preview so you can see the result before you print it. No other free tool shows you this.
Files
Image to STL Converter
Turn a PNG, JPG or photo into a printable STL — raised relief or backlit lithophane — with a simulated preview of the printed surface. Watertight output, nothing uploaded.
Files
3D File Converter
Convert between STL, OBJ, 3MF and PLY entirely in your browser — 12 conversion routes, nothing uploaded, no file size limit.
Files
STL Viewer
Open an STL or OBJ file in your browser. Rotate it, read exact dimensions and volume, and check the mesh is watertight — nothing uploaded, no size limit.
Pricing
3D Printing Cost Calculator (STL)
Drop an STL and get the true cost — filament, electricity, machine wear, your time, failures and Etsy/eBay fees. Not just grams × price.
Production
Print Time Estimator
Drop an STL, get print time, filament grams, and cost — no slicing, no upload. Exact mesh volume + flow rates calibrated per printer class.
Engineering
Press-Fit & Clearance Calculator
Design fits that work first try: press, snug, slide, or free — printed-on-metal or printed-on-printed. Exact CAD diameters for both parts.
Materials
Filament Remaining Calculator
Weigh the spool, pick the brand, get grams and meters left — and whether tonight’s print makes it. 30+ empty spool weights built in.
Buying
Which 3D Printer Should I Buy?
6 questions, 60 seconds. Scores 60+ printers against your budget, materials, and use case — recommends the 3 best matches with reasons.
Pricing
3D Print Pricing Calculator
Live pricing with 50+ printers, AMS purge waste, Etsy/eBay/Amazon fees, depreciation, failure buffer.
Engineering
Hole Tolerance Calculator
Get the exact CAD diameter for heat-set inserts, M3-M8 bolts, bearings, magnets — material-aware, with calibration override.
Materials
Filament Cost Comparator
Compare 30+ filaments side-by-side for your specific part. Factors density and failure rate — things $/kg comparisons miss.
Pricing
Resin Cost Calculator
Resin volume, FEP wear, LCD lifetime, IPA cycles, wash & cure power, water-washable mode — the cost no other calculator gets right.